JP3589616B2

JP3589616B2 - Monitoring method and monitoring system for WDM optical communication network

Info

Publication number: JP3589616B2
Application number: JP2000181311A
Authority: JP
Inventors: 靖秀渡邊; 岡本　　聡
Original assignee: Nippon Telegraph and Telephone Corp; NTT Inc USA
Current assignee: NTT Inc; NTT Inc USA
Priority date: 2000-06-16
Filing date: 2000-06-16
Publication date: 2004-11-17
Anticipated expiration: 2020-06-16
Also published as: JP2001358665A

Description

【０００１】
【発明の属する技術分野】
本発明は、複数の異なる波長の光パスが網状伝送路に設定された波長多重光通信網の監視方法および監視システムに関する。特に、波長多重リンクを介して接続される任意の２つの光通信ノード間に片方向の光パスが設定され、その光パスと同方向に光パス監視信号が設定された波長多重光通信網の監視方法および監視システムに関する。
【０００２】
【従来の技術】
図１０は、従来の波長多重光通信網の監視システムの構成例を示す（参考文献：特開平９−２４７１０６号公報）。
【０００３】
図において、光通信ノード１０１から光通信ノード１０３への伝送方向を上り方向、光通信システム１０３から通信ノード１０１への伝送方向を下り方向と定義する。上り方向では、光通信ノード１０１と光通信ノード１０２が波長多重リンク１１１を介して接続され、光通信ノード１０２と光通信ノード１０３が波長多重リンク１１２，リピータ１０４，波長多重リンク１１３を介して接続される。下り方向では、光通信ノード１０３と光通信ノード１０２が波長多重リンク１１４，リピータ１０４，波長多重リンク１１５を介して接続され、光通信ノード１０２と光通信ノード１０１が波長多重リンク１１６を介して接続される。
【０００４】
ここで、２つの光通信ノード１０１，１０３間に双方向に設定される光パスの終端点間で、光パス＋光パス監視信号１２１，１２２を生成し、主信号と光パス監視信号を同一の信号チャネルで伝送して光パス監視信号の双方向伝送を行うことにより、網状伝送路全体の監視が可能になっている。
【０００５】
例えば、光通信ノード１０１から光通信ノード１０３への光パスを監視するには、光パス監視信号を上りの主信号に重畳し、次に下りの主信号に重畳して折り返し、光パス監視信号を光通信ノード１０１と光通信ノード１０３との間を往復させる。同様に、光通信ノード１０３から光通信ノード１０１への光パスを監視するには、光パス監視信号を下りの主信号に重畳し、次に上りの主信号に重畳して折り返し、光パス監視信号を光通信ノード１０３と光通信ノード１０１との間を往復させる。なお、逆方向の主信号に重畳して折り返す光パス監視信号について、以下必要に応じて「逆方向光パス監視信号」という。
【０００６】
また、波長多重リンクの両端の光通信ノード間に設定される波長多重リンク・光通信ノード監視信号１３１〜１３４と、光通信ノードとリピータ間、または光通信ノード間、またはリピータ間に設定される波長多重リンク・リピータ監視信号１４１〜１４６は、主信号とは異なるチャネルで波長多重リンク中を伝送される。ただし、波長多重リンク・光通信ノード監視信号１３１〜１３４や波長多重リンク・リピータ監視信号１４１〜１４６は、常時存在するとは限らず、必要に応じて設定される。
【０００７】
なお、光通信ノード１０１〜１０３には、光パス＋光パス監視信号１２１，１２２を送受信する光パス・光パス監視信号終端装置１５１〜１５４が配置される。また、光通信ノード１０１〜１０３には、波長多重リンク・光通信ノード監視信号１３１〜１３４を送受信する波長多重リンク・光通信ノード監視信号終端装置１６１〜１６８が配置される。また、光通信ノード１０１〜１０３およびリピータ１０４には、波長多重リンク・リピータ監視信号１４１〜１４６を送受信する波長多重リンク・リピータ監視信号終端装置１７１〜１８２が配置される。各終端装置は、それぞれ対応する光通信ノードおよびリピータの制御装置１９１〜１９４に接続され、相互に情報の交換および監視・制御処理を行う。また、各制御装置１９１〜１９４は、通信網監視装置１９５に接続されて相互に情報の交換を行う。
【０００８】
【発明が解決しようとする課題】
図１０に示す従来の波長多重光通信網の監視システムでは、個々の光パス監視信号を主信号と同一の信号チャネルで伝送しているので、光パス監視信号を双方向に伝送するためには、任意の２つの光通信ノード間に双方向に光パスが設定されている必要がある。そのため、光通信ノード間に片方向の光パスを設定すればよい場合でも、当該光通信ノード間に双方向の光パスを設定する必要がある。
【０００９】
図１１は、光通信ノード間に片方向の光パスが設定される波長多重光通信網の監視システムの構成例を示す。なお、図１０に示す符号と同一符号のものは同一の機能を有する。ここでは、光通信ノード１０３から光通信ノード１０１へ下り方向の光パスが設定され、下り方向の光パス＋光パス監視信号１２２のみが伝送される状況を示す。このようなケースは、例えば放送型の通信形態にみられるものであり、双方向に光パスが設定されていない。すなわち、上り方向に光パス監視信号（逆方向光パス監視信号）を伝送するための光パスがないので、光パス監視信号を主信号に重畳する従来の方法では、光パス監視信号を双方向伝送することができなかった。
【００１０】
本発明は、任意の光通信ノード間に片方向（図１１の例では下り方向）の光パスしか設定されていない状況でも、この光通信ノード間で光パス監視信号の双方向伝送を可能とし、網状伝送路全体での監視を可能とする波長多重光通信網の監視方法および監視システムを提供することを目的とする。
【００１１】
【課題を解決するための手段】
本発明（請求項１，４）の波長多重光通信網の監視方法および監視システムは、片方向の光パスを終端する２つの光通信ノード間で、片方向の光パスおよび光パス監視信号に対して逆方向に信号チャネルを追加し、その信号チャネルを用いて片方向の光パスの光パス監視信号に対する逆方向の光パス監視信号を伝送し、双方向の光パス監視信号の伝送を行う。これにより、片方向のみに光パスが設定されている状況でも、追加された信号チャネルにより光パス監視信号を双方向に伝送することが可能となる。
【００１２】
また、同じ終端点を共有する複数の片方向の光パスおよび光パス監視信号に対しては、信号チャネルを共有して複数の逆方向の光パス監視信号を伝送するようにしてもよい（請求項２，５）。
【００１３】
本発明（請求項３，６）の波長多重光通信網の監視方法および監視システムは、波長多重リンクを介して隣接する光通信ノード間に双方向の１ホップ光パスを設定し、そのペイロード部を用いて片方向の光パスの光パス監視信号に対する逆方向の光パス監視信号を伝送し、双方向の光パス監視信号の伝送を行う。これにより、片方向のみに光パスが設定されている状況でも、設定された１ホップ光パスのペイロード部を用いて、光パス監視信号を双方向に伝送することが可能となる。
【００２２】
【発明の実施の形態】
（第１の実施形態）
図１は、本発明の波長多重光通信網の監視システムの第１の実施形態を示す。なお、図１０に示す従来構成の符号と同一符号のものは同一の機能を有する。ここでは、図１１に示すように、光通信ノード１０３から光通信ノード１０１へ下り方向の光パスが設定され、下り方向の光パス＋光パス監視信号１２２が伝送される状況において、上り方向の光パス監視信号（逆方向光パス監視信号）を伝送するための構成を示す。
【００２３】
本実施形態の構成では、下り方向の光パス監視信号に対応する逆方向光パス監視信号２０１を伝送するために、新たに信号チャネル（波長）を１本追加する。光通信ノード１０１，１０３には、この逆方向光パス監視信号２０１を送受信する逆方向光パス監視信号終端装置２１１，２１２を配置する。
【００２４】
なお、同じ終端点を共有する複数の片方向の光パスおよび光パス監視信号に対しては、それぞれに対して信号チャネルを追加するのではなく、１本の信号チャネルを共有して複数の逆方向の光パス監視信号を伝送するようにしてもよい。この場合に、２本目以降の片方向の光パスおよび光パス監視信号に対して、例えばペイロード部などを用いて逆方向の光パス監視信号を伝送してもよい。
【００２５】
ここで、各光通信ノード、リピータ、各波長多重リンクの構成について整理する。光通信ノード１０１は、上り方向に対して、逆方向光パス監視信号終端装置２１１、波長多重リンク・光通信ノード監視信号終端装置１６１、波長多重リンク・リピータ監視信号終端装置１７１を備え、下り方向に対して、光パス・光パス監視信号終端装置１５４、波長多重リンク・光通信ノード監視信号終端装置１６８、波長多重リンク・リピータ監視信号終端装置１８２を備える。さらに、各終端装置は、制御装置１９１と相互に情報の交換を行い、監視・制御処理を行う。
【００２６】
光通信ノード１０２は、上り方向に対して、波長多重リンク・光通信ノード監視信号終端装置１６２，１６３、波長多重リンク・リピータ監視信号終端装置１７２，１７３を備え、下り方向に対して、波長多重リンク・光通信ノード監視信号終端装置１６６，１６７、波長多重リンク・リピータ監視信号終端装置１８０，１８１を備える。さらに、各終端装置は、制御装置１９２と相互に情報の交換を行い、監視・制御処理を行う。
【００２７】
リピータ１０４は、上り方向に対して、波長多重リンク・リピータ監視信号終端装置１７４，１７５を備え、下り方向に対して、波長多重リンク・リピータ監視信号終端装置１７８，１７９を備える。さらに、各終端装置は、制御装置１９３と相互に情報の交換を行い、監視・制御処理を行う。
【００２８】
光通信ノード１０３は、上り方向に対して、逆方向光パス監視信号終端装置２１２、波長多重リンク・光通信ノード監視信号終端装置１６４、波長多重リンク・リピータ監視信号終端装置１７６を備え、下り方向に対して、光パス・光パス監視信号終端装置１５３、波長多重リンク・光通信ノード監視信号終端装置１６５、波長多重リンク・リピータ監視信号終端装置１７７を備える。さらに、各終端装置は、制御装置１９４と相互に情報の交換を行い、監視・制御処理を行う。また、各制御装置１９１〜１９４は、通信網監視装置１９５に接続され、相互に情報の交換を行う。
【００２９】
上り方向の波長多重リンク１１１には、送信端を光通信ノード１０１の逆方向光パス監視信号終端装置２１１、受信端を光通信ノード１０３の逆方向光パス監視信号終端装置２１２とする逆方向光パス監視信号２０１と、送信端を光通信ノード１０１の波長多重リンク・光通信ノード監視信号終端装置１６１、受信端を光通信ノード１０２の波長多重リンク・光通信ノード監視信号終端装置１６２とする波長多重リンク・光通信ノード監視信号１３１と、送信端を光通信ノード１０１の波長多重リンク・リピータ監視信号終端装置１７１、受信端を光通信ノード１０２の波長多重リンク・リピータ監視信号終端装置１７２とする波長多重リンク・リピータ監視信号１４１が設定される。
【００３０】
上り方向の波長多重リンク１１２には、逆方向光パス監視信号２０１と、送信端を光通信ノード１０２の波長多重リンク・光通信ノード監視信号終端装置１６３、受信端を光通信ノード１０３の波長多重リンク・光通信ノード監視信号終端装置１６４とする波長多重リンク・光通信ノード監視信号１３２と、送信端を光通信ノード１０２の波長多重リンク・リピータ監視信号終端装置１７３、受信端をリピータ１０４の波長多重リンク・リピータ監視信号終端装置１７４とする波長多重リンク・リピータ監視信号１４２が設定される。
【００３１】
上り方向の波長多重リンク１１３には、逆方向光パス監視信号２０１と、波長多重リンク・光通信ノード監視信号１３２と、送信端をリピータ１０４の波長多重リンク・リピータ監視信号終端装置１７５、受信端を光通信ノード１０３の波長多重リンク・リピータ監視信号終端装置１７６とする波長多重リンク・リピータ監視信号１４３が設定される。
【００３２】
下り方向の波長多重リンク１１４には、送信端を光通信ノード１０３の光パス・光パス監視信号終端装置１５３、受信端を光通信ノード１０１の光パス・光パス監視信号終端装置１５４とする光パス＋光パス監視信号１２２と、送信端を光通信ノード１０３の波長多重リンク・光通信ノード監視信号終端装置１６５、受信端を光通信ノード１０２の波長多重リンク・光通信ノード監視信号終端装置１６６とする波長多重リンク・光通信ノード監視信号１３３と、送信端を光通信ノード１０３の波長多重リンク・リピータ監視信号終端装置１７７、受信端をリピータ１０４の波長多重リンク・リピータ監視信号終端装置１７８とする波長多重リンク・リピータ監視信号１４４が設定される。
【００３３】
下り方向の波長多重リンク１１５には、光パス＋光パス監視信号１２２と、波長多重リンク・光通信ノード監視信号１３３と、送信端をリピータ１０４の波長多重リンク・リピータ監視信号終端装置１７９、受信端を光通信ノード１０２の波長多重リンク・リピータ監視信号終端装置１８０とする波長多重リンク・リピータ監視信号１４５が設定される。
【００３４】
下り方向の波長多重リンク１１６には、光パス＋光パス監視信号１２２と、送信端を光通信ノード１０２の波長多重リンク・光通信ノード監視信号終端装置１６７、受信端を光通信ノード１０１の波長多重リンク・光通信ノード監視信号終端装置１６８とする波長多重リンク・光通信ノード監視信号１３４と、送信端を光通信ノード１０２の波長多重リンク・リピータ監視信号終端装置１８１、受信端を光通信ノード１０１の波長多重リンク・リピータ監視信号終端装置１８２とする波長多重リンク・リピータ監視信号１４６が設定される。
【００３５】
ここで、図２を参照し、逆方向光パス監視信号終端装置２１１，２１２の送信・受信動作について説明する。図２（ａ）は、光通信ノード１０１の送信端に配置される逆方向光パス監視信号終端装置２１１として、電気／光変換器２２１を用いた構成例を示す。制御装置１９１から出力される電気信号の逆方向光パス監視信号２３１は、電気／光変換器２２１で光信号（波長λｓｖ）の逆方向光パス監視信号２０１に変換され、波長多重リンク１１１に送信される。波長λｓｖは、他の光パス（主信号）や波長多重リンク・光通信ノード監視信号、波長多重リンク・リピータ監視信号の波長と異なるように設定される。
【００３６】
図２（ｂ）は、光通信ノード１０３の受信端に配置される逆方向光パス監視信号終端装置２１２として、光／電気変換器２２２を用いた構成例を示す。波長多重リンク１１３から分波された波長λｓｖの逆方向光パス監視信号２０１は、光／電気変換器２２２で電気信号の逆方向光パス監視信号２３２に変換され、制御装置１９４へ送られる。
【００３７】
（第２の実施形態）
図３は、本発明の波長多重光通信網の監視システムの第２の実施形態を示す。なお、図１に示す第１の実施形態の符号と同一符号のものは同一の機能を有する。ここでは、第１の実施形態と同様に、光通信ノード１０３から光通信ノード１０１へ下り方向の光パスが設定され、下り方向の光パス＋光パス監視信号１２２のみが伝送される状況において、上り方向の光パス監視信号（逆方向光パス監視信号）を伝送するための構成を示すが、下り方向については同一構成であるのでその部分については省略している。
【００３８】
本実施形態の構成では、下り方向の光パス監視信号に対応する逆方向光パス監視信号を伝送するために、波長多重リンクを介して隣接する光通信ノード間に光パス（１ホップ光パス）を設定し、逆方向光パス監視信号をこの１ホップ光パスのペイロード部に格納して伝送する。この信号を光パス＋逆方向光パス監視信号２０２，２０３という。光通信ノード１０１〜１０３には、この光パス＋逆方向光パス監視信号２０２，２０３を送受信する光パス／逆方向光パス監視信号終端装置２１３〜２１６を配置する。
【００３９】
なお、１ホップ光パスは各光通信ノードで終端されるので、例えば逆方向光パス監視信号にアドレス付与し、各光通信ノードの制御装置でルーティングすることにより、目的の光通信ノード（下り方向の光パスの送信端である光通信ノード１０３）へ伝送されるように設定する。
【００４０】
（第３の実施形態：参考例）
図４は、本発明の波長多重光通信網の監視システムの第３の実施形態（参考例）を示す。なお、図１に示す第１の実施形態の符号と同一符号のものは同一の機能を有する。ここでは、第１の実施形態および第２の実施形態と同様に、下り方向に関する部分については省略している。
【００４１】
本実施形態の構成では、下り方向の光パス監視信号に対応する逆方向光パス監視信号を波長多重リンク・光通信ノード監視信号に多重し、両監視信号を同一の信号チャネルで伝送する。この信号を逆方向光パス監視信号＋波長多重リンク・光通信ノード監視信号３０１，３０２という。光通信ノード１０１〜１０３には、逆方向光パス監視信号＋波長多重リンク・光通信ノード監視信号３０１，３０２を送受信する逆方向光パス監視信号／波長多重リンク・光通信ノード監視信号終端装置３１１〜３１４を配置する。
【００４２】
なお、本実施形態の監視システムは、波長多重リンク・光通信ノード監視信号と波長多重リンク・リピータ監視信号の両方が存在する場合や、波長多重リンク・光通信ノード監視信号のみが存在する場合のいずれにも適用可能である。
【００４３】
以下、本実施形態の説明では、単に監視信号３０１，３０２、終端装置３１１〜３１４とする。図５を参照し、終端装置３１１〜３１４の送信・受信動作について説明する。
【００４４】
図５（ａ）は、光通信ノード１０１，１０２の送信端に配置される終端装置３１１，３１３として、電気段の多重化器３２１および電気／光変換器３２２を用いた構成例を示す。制御装置１９１，１９２から出力される電気信号の逆方向光パス監視信号３３１および波長多重リンク・光通信ノード監視信号３３２は、多重化器３２１で多重化処理され、電気信号の逆方向光パス監視信号＋波長多重リンク・光通信ノード監視信号３３３が生成される。この電気信号の逆方向光パス監視信号＋波長多重リンク・光通信ノード監視信号３３３は、電気／光変換器３２２で光信号（波長λｓｖ）の監視信号３０１，３０２に変換され、波長多重リンク１１１，１１２へ送信される。波長λｓｖは、他の光パス（主信号）や波長多重リンク・リピータ監視信号の波長と異なるように設定される。
【００４５】
図５（ｂ）は、光通信ノード１０２，１０３の受信端に配置される終端装置３１２，３１４として、光／電気変換器３２３および電気段の多重分離器３２４を用いた構成例を示す。波長多重リンク１１１，１１３から分波された波長λｓｖの監視信号３０１，３０２は、光／電気変換器３２３で電気信号の逆方向光パス監視信号＋波長多重リンク・光通信ノード監視信号３３４に変換される。この信号は、さらに多重分離器３２４で電気信号の逆方向光パス監視信号３３５および波長多重リンク・光通信ノード監視信号３３６に分離され、制御装置１９２，１９４へ送られる。
【００４６】
（第４の実施形態：参考例）
図６は、本発明の波長多重光通信網の監視システムの第４の実施形態（参考例）を示す。なお、図１に示す第１の実施形態の符号と同一符号のものは同一の機能を有する。ここでは、第１の実施形態〜第３の実施形態と同様に、下り方向に関する部分については省略している。
【００４７】
本実施形態の構成では、下り方向の光パス監視信号に対応する逆方向光パス監視信号を波長多重リンク・リピータ監視信号に多重し、両監視信号を同一の信号チャネルで伝送する。この信号を逆方向光パス監視信号＋波長多重リンク・リピータ監視信号４０１〜４０３という。光通信ノード１０１〜１０３およびリピータ１０４には、逆方向光パス監視信号＋波長多重リンク・リピータ監視信号４０１〜４０３を送受信する逆方向光パス監視信号／波長多重リンク・リピータ監視信号終端装置４１１〜４１６を配置する。ただし、リピータ１０４では、逆方向光パス監視信号／波長多重リンク・リピータ監視信号終端装置４１４，４１５間に、逆方向光パス監視信号をスルーするための制御線４１７が設けられる。
【００４８】
なお、本実施形態の監視システムは、波長多重リンク・光通信ノード監視信号と波長多重リンク・リピータ監視信号の両方が存在する場合や、波長多重リンク・リピータ監視信号のみが存在する場合のいずれにも適用可能である。
【００４９】
以下、本実施形態の説明では、単に監視信号４０１〜４０３、終端装置４１１〜４１６とする。図７を参照し、終端装置４１１〜４１６の送信・受信動作について説明する。
【００５０】
図７（ａ）は、光通信ノード１０１，１０２の送信端に配置される終端装置４１１，４１３として、電気／光変換器４２１および光変調器４２２を用いた構成例を示す。制御装置１９１，１９２から出力される電気信号の逆方向光パス監視信号４３１は、電気／光変換器４２１で光信号（波長λｓｖ）の逆方向光パス監視信号４３２に変換される。波長λｓｖは、他の光パス（主信号）や波長多重リンク・光通信ノード監視信号の波長と異なるように設定される。光変調器４２２は、この光信号の逆方向光パス監視信号４３２を制御装置１９１，１９２から出力される電気信号の波長多重リンク・リピータ監視信号４３３で変調し、光信号の監視信号４０１，４０２を生成して波長多重リンク１１１，１１２へ送信する。
【００５１】
図７（ｂ）は、光通信ノード１０２，１０３の受信端に配置される終端装置４１２，４１６として、光信号分配器４２３、光／電気変換器４２４および光復調器４２５を用いた構成例を示す。波長多重リンク１１１，１１３から分波された波長λｓｖの監視信号４０１，４０３は、光信号分配器４２３で２分配され、それぞれ光／電気変換器４２４と光復調器４２５に入力される。光／電気変換器４２４では、監視信号４０１，４０３から電気信号の逆方向光パス監視信号４３４に変換し、制御装置１９２，１９４へ送出する。光復調器４２５では、監視信号４０１，４０３から電気信号の波長多重リンク・リピータ監視信号４３５を再生し、制御装置１９２，１９４へ送出する。
【００５２】
図７（ｃ）は、リピータ１０４の受信端に配置される終端装置４１４として、光信号分配器４２３、光／電気変換器４２４および光復調器４２５を用いた構成例と、送信端に配置される終端装置４１５として、電気／光変換器４２１および光変調器４２２を用いた構成例を示す。なお、光／電気変換器４２４と電気／光変調器４２１は、制御線４１７を介して接続される。
【００５３】
波長多重リンク１１２から分波された波長λｓｖの監視信号４０２は、光信号分配器４２３で２分配され、それぞれ光／電気変換器４２４と光復調器４２５に入力される。光／電気変換器４２４では、監視信号４０２から電気信号の逆方向光パス監視信号４３４に変換し、制御線４１７を介して電気／光変換器４２１へ送り、再び光信号（波長λｓｖ）の逆方向光パス監視信号４３２に変換する。これにより、波長多重リンク・リピータ監視信号による変調成分が除去される。光復調器４２５では、監視信号４０２から電気信号の波長多重リンク・リピータ監視信号４３５を再生し、制御装置１９３へ送出する。光変調器４２２は、電気／光変換器４２１から出力された光信号（波長λｓｖ）の逆方向光パス監視信号４３２を、制御装置１９３から出力される電気信号の波長多重リンク・リピータ監視信号４３３で変調し、光信号の監視信号４０３を生成して波長多重リンク１１３へ送信する。
【００５４】
ところで、第３の実施形態は、逆方向光パス監視信号と波長多重リンク・光通信ノード監視信号を電気段で多重し、同一の信号チャネルで伝送するものである。第４の実施形態は、逆方向光パス監視信号と波長多重リンク・リピータ監視信号を光段で多重し、同一の信号チャネルで伝送するものである。それぞれの多重化方法は入れ替えが可能であり、第３の実施形態を光段で多重化する構成としてもよく、また第４の実施形態を電気段で多重化する構成としてもよい。
【００５５】
（第５の実施形態：参考例）
図８は、本発明の波長多重光通信網の監視システムの第５の実施形態（参考例）を示す。なお、図１に示す第１の実施形態の符号と同一符号のものは同一の機能を有する。ここでは、第１の実施形態〜第４の実施形態と同様に、下り方向に関する部分については省略している。
【００５６】
本実施形態の構成では、下り方向の光パス監視信号に対応する逆方向光パス監視信号を、波長多重リンク・光通信ノード監視信号および波長多重リンク・リピータ監視信号に多重し、各監視信号を同一の信号チャネルで伝送する。この信号を逆方向光パス監視信号＋波長多重リンク・光通信ノード監視信号＋波長多重リンク・リピータ監視信号５０１〜５０３という。光通信ノード１０１〜１０３およびリピータ１０４には、逆方向光パス監視信号＋波長多重リンク・光通信ノード監視信号＋波長多重リンク・リピータ監視信号５０１〜５０３を送受信する逆方向光パス監視信号／波長多重リンク・光通信ノード監視信号／波長多重リンク・リピータ監視信号終端装置５１１〜５１６を配置する。ただし、リピータ１０４では、逆方向光パス監視信号／波長多重リンク・光通信ノード監視信号／波長多重リンク・リピータ監視信号終端装置５１４，５１５間に、逆方向光パス監視信号および波長多重リンク・光通信ノード監視信号をスルーするための制御線５１７，５１８が設けられる。
【００５７】
以下、本実施形態の説明では、単に監視信号５０１〜５０３、終端装置５１１〜５１６とする。図９を参照し、終端装置５１１〜５１６の送信・受信動作について説明する。なお、ここでは、３つの監視信号を電気段で多重化する例を示すが、電気段と光段の多重化方法を組み合わせる方法（第３の実施形態と第４の実施形態の組合せ）をとることも可能である。
【００５８】
図９（ａ）は、光通信ノード１０１，１０２の送信端に配置される終端装置５１１，５１３として、電気段の多重化器５２１および電気／光変換器５２２を用いた構成例を示す。制御装置１９１，１９２から出力される電気信号の逆方向光パス監視信号５３１、波長多重リンク・光通信ノード監視信号５３２および波長多重リンク・リピータ監視信号５３３は、多重化器５２１で多重化処理され、電気信号の逆方向光パス監視信号＋波長多重リンク・光通信ノード監視信号＋波長多重リンク・リピータ監視信号５３４が生成される。この電気信号は、電気／光変換器５２２で光信号（波長λｓｖ）の監視信号５０１，５０２に変換され、波長多重リンク１１１，１１２へ送信される。波長λｓｖは、他の光パス（主信号）の波長と異なるように設定される。
【００５９】
図９（ｂ）は、光通信ノード１０２，１０３の受信端に配置される終端装置５１２，５１６として、光／電気変換器５２３および電気段の多重分離器５２４を用いた構成例を示す。波長多重リンク１１１，１１３から分波された波長λｓｖの監視信号５０１，５０３は、光／電気変換器５２３で電気信号の逆方向光パス監視信号＋波長多重リンク・光通信ノード監視信号＋波長多重リンク・リピータ監視信号５３５に変換される。この信号は、さらに多重分離器５２４で電気信号の逆方向光パス監視信号５３６、波長多重リンク・光通信ノード監視信号５３７および波長多重リンク・リピータ監視信号５３８に分離され、それぞれ制御装置１９２，１９４へ送られる。
【００６０】
図９（ｃ）は、リピータ１０４の受信端に配置される終端装置５１４として、光／電気変換器５２３および電気段の多重分離器５２４を用いた構成例と、送信端に配置される終端装置５１５として、電気段の多重化器５２１および電気／光変換器５２２を用いた構成例を示す。なお、多重分離器５２４と多重化器５２１は、制御線５１７，５１８を介して接続される。
【００６１】
波長多重リンク１１２から分波された波長λｓｖの監視信号５０２は、光／電気変換器５２３で電気信号の逆方向光パス監視信号＋波長多重リンク・光通信ノード監視信号＋波長多重リンク・リピータ監視信号５３５に変換される。この信号は、さらに多重分離器５２４で電気信号の逆方向光パス監視信号５３６、波長多重リンク・光通信ノード監視信号５３７および波長多重リンク・リピータ監視信号５３８に分離される。このうち、波長多重リンク・リピータ監視信号５３８は、リピータ１０４で終端処理されるために制御装置１９３へ送られる。
【００６２】
逆方向光パス監視信号５３６および波長多重リンク・光通信ノード監視信号５３７は、制御線５１７，５１８を介して多重化器５２１へ送られる。多重化器５２１では、逆方向光パス監視信号５３６および波長多重リンク・光通信ノード監視信号５３７と、制御装置１９３から出力される電気信号の波長多重リンク・リピータ監視信号５３３とを多重化処理し、電気信号の逆方向光パス監視信号＋波長多重リンク・光通信ノード監視信号＋波長多重リンク・リピータ監視信号５３４が生成される。この電気信号は、電気／光変換器５２２で光信号（波長λｓｖ）の監視信号５０３に変換され、波長多重リンク１１３へ送信される。波長λｓｖは、他の光パス（主信号）の波長と異なるように設定される。
【００６３】
【発明の効果】
以上説明したように、本発明の波長多重光通信網の監視方法および監視システムは、任意の２つの光通信ノード間に設定される光パスが片方向であっても、信号チャネルの追加や１ホップ光パスのペイロード部を用いて逆方向の光パス監視信号を伝送することにより、双方向の光パス監視信号の伝送が可能となる。
【００６５】
したがって、波長多重光通信網にどのような光パスが設定されていても、波長多重光通信網全体で各光パスの監視を確実に行うことができる。
【図面の簡単な説明】
【図１】本発明の波長多重光通信網の監視システムの第１の実施形態を示す図。
【図２】第１の実施形態の逆方向光パス監視信号終端装置２１１，２１２の構成例を示す図。
【図３】本発明の波長多重光通信網の監視システムの第２の実施形態を示す図。
【図４】本発明の波長多重光通信網の監視システムの第３の実施形態を示す図。
【図５】第３の実施形態の終端装置３１１〜３１４の構成例を示す図。
【図６】本発明の波長多重光通信網の監視システムの第４の実施形態を示す図。
【図７】第４の実施形態の終端装置４１１〜４１６の構成例を示す図。
【図８】本発明の波長多重光通信網の監視システムの第５の実施形態を示す図。
【図９】第５の実施形態の終端装置５１１〜５１６の構成例を示す図。
【図１０】従来の波長多重光通信網の監視システムの構成例を示す図。
【図１１】光通信ノード間に片方向の光パスが設定される従来の波長多重光通信網の監視システムの構成例を示す図。
【符号の説明】
１０１〜１０３光通信ノード
１０４リピータ
１１１〜１１６波長多重リンク
１２１，１２２光パス＋光パス監視信号
１３１〜１３４波長多重リンク・光通信ノード監視信号
１４１〜１４６波長多重リンク・リピータ監視信号
１５１〜１５４光パス・光パス監視信号終端装置
１６１〜１６８波長多重リンク・光通信ノード監視信号終端装置
１７１〜１８２波長多重リンク・リピータ監視信号終端装置
１９１〜１９４制御装置
１９５通信網監視装置
２０１逆方向光パス監視信号
２０２，２０３光パス＋逆方向光パス監視信号
２１１，２１２逆方向光パス監視信号終端装置
２２１電気／光変換器
２２２光／電気変換器
３０１逆方向光パス監視信号＋波長多重リンク・光通信ノード監視信号
３１１〜３１４逆方向光パス監視信号／波長多重リンク・光通信ノード監視信号終端装置
３２１多重化器
３２２電気／光変換器
３２３光／電気変換器
３２４多重分離器
４０１〜４０３逆方向光パス監視信号＋波長多重リンク・リピータ監視信号
４１１〜４１６逆方向光パス監視信号／波長多重リンク・リピータ監視信号終端装置
４１７制御線
４２１電気／光変換器
４２２光変調器
４２３光信号分配器
４２４光／電気変換器
４２５光復調器
５０１〜５０３逆方向光パス監視信号＋波長多重リンク・光通信ノード監視信号＋波長多重リンク・リピータ監視信号
５１１〜５１６逆方向光パス監視信号／波長多重リンク・光通信ノード監視信号／波長多重リンク・リピータ監視信号終端装置
５１７，５１８制御線
５２１多重化器
５２２電気／光変換器
５２３光／電気変換器
５２４多重分離器[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a monitoring method and a monitoring system for a wavelength division multiplexing optical communication network in which optical paths of a plurality of different wavelengths are set in a mesh transmission path. In particular, a one-way optical path is set between any two optical communication nodes connected via a wavelength-division multiplex link, and an optical path monitoring signal is set in the same direction as the optical path. The present invention relates to a monitoring method and a monitoring system.
[0002]
[Prior art]
FIG. 10 shows a configuration example of a conventional monitoring system for a wavelength division multiplexing optical communication network (reference: Japanese Patent Laid-Open No. 9-247106).
[0003]
In the figure, the transmission direction from the optical communication node 101 to the optical communication node 103 is defined as an up direction, and the transmission direction from the optical communication system 103 to the communication node 101 is defined as a down direction. In the upstream direction, the optical communication node 101 and the optical communication node 102 are connected via a wavelength multiplex link 111, and the optical communication node 102 and the optical communication node 103 are connected via a wavelength multiplex link 112, a repeater 104, and a wavelength multiplex link 113. Is done. In the downstream direction, the optical communication node 103 and the optical communication node 102 are connected via the wavelength multiplex link 114, the repeater 104, and the wavelength multiplex link 115, and the optical communication node 102 and the optical communication node 101 are connected via the wavelength multiplex link 116. Is done.
[0004]
Here, optical path + optical path monitoring signals 121 and 122 are generated between the end points of the optical paths set bidirectionally between the two optical communication nodes 101 and 103, and the main signal and the optical path monitoring signal are made the same. By performing the bidirectional transmission of the optical path monitoring signal by transmitting the signal through the above-mentioned signal channel, the entire network transmission path can be monitored.
[0005]
For example, in order to monitor an optical path from the optical communication node 101 to the optical communication node 103, an optical path monitoring signal is superimposed on an upstream main signal, and then superimposed on a downstream main signal and turned back. Is reciprocated between the optical communication node 101 and the optical communication node 103. Similarly, in order to monitor the optical path from the optical communication node 103 to the optical communication node 101, the optical path monitoring signal is superimposed on the downstream main signal, and then superimposed on the upstream main signal and turned back. The signal travels back and forth between the optical communication node 103 and the optical communication node 101. The optical path monitoring signal that is superimposed on the main signal in the reverse direction and turned back is hereinafter referred to as a “reverse optical path monitoring signal” as necessary.
[0006]
The wavelength multiplex link / optical communication node monitoring signals 131 to 134 are set between the optical communication nodes at both ends of the wavelength multiplex link, and are set between the optical communication node and the repeater, or between the optical communication nodes, or between the repeaters. The wavelength multiplex link repeater monitoring signals 141 to 146 are transmitted through the wavelength multiplex link on a channel different from the main signal. However, the wavelength multiplex link / optical communication node monitoring signals 131 to 134 and the wavelength multiplex link / repeater monitoring signals 141 to 146 are not always present, and are set as needed.
[0007]
In the optical communication nodes 101 to 103, optical path / optical path monitoring signal terminating devices 151 to 154 for transmitting and receiving the optical path + optical path monitoring signals 121 and 122 are arranged. In the optical communication nodes 101 to 103, wavelength multiplex link / optical communication node monitoring signal terminating devices 161 to 168 for transmitting and receiving wavelength multiplex link / optical communication node monitoring signals 131 to 134 are arranged. In the optical communication nodes 101 to 103 and the repeater 104, wavelength division multiplex link / repeater supervisory signal terminating devices 171 to 182 for transmitting and receiving the wavelength division multiplex link / repeater supervisory signals 141 to 146 are arranged. Each terminating device is connected to the corresponding optical communication node and repeater control devices 191 to 194, and mutually exchanges information and performs monitoring / control processing. Each of the control devices 191 to 194 is connected to the communication network monitoring device 195 and exchanges information with each other.
[0008]
[Problems to be solved by the invention]
In the conventional monitoring system for a wavelength division multiplexing optical communication network shown in FIG. 10, since each optical path monitoring signal is transmitted on the same signal channel as the main signal, it is necessary to transmit the optical path monitoring signal in two directions. It is necessary that an optical path is set bidirectionally between any two optical communication nodes. Therefore, even when a one-way optical path may be set between the optical communication nodes, it is necessary to set a bidirectional optical path between the optical communication nodes.
[0009]
FIG. 11 shows a configuration example of a wavelength multiplexing optical communication network monitoring system in which a one-way optical path is set between optical communication nodes. Note that the same reference numerals as those shown in FIG. 10 have the same functions. Here, a situation is shown in which a downstream optical path is set from the optical communication node 103 to the optical communication node 101, and only the downstream optical path + optical path monitoring signal 122 is transmitted. Such a case is found, for example, in a broadcast-type communication mode, in which an optical path is not set bidirectionally. That is, since there is no optical path for transmitting the optical path monitor signal (reverse optical path monitor signal) in the upstream direction, the conventional method of superimposing the optical path monitor signal on the main signal causes the optical path monitor signal to be bidirectional. Could not transmit.
[0010]
The present invention enables bidirectional transmission of an optical path monitor signal between optical communication nodes even in a situation where only one-way (downward in the example of FIG. 11) optical path is set between any optical communication nodes. It is another object of the present invention to provide a monitoring method and a monitoring system for a wavelength division multiplexing optical communication network that enable monitoring of the entire network transmission path.
[0011]
[Means for Solving the Problems]
The present invention (claim 1, 4 The method and system for monitoring a wavelength division multiplexed optical communication network according to the first aspect of the present invention provide a method for monitoring a signal channel between two optical communication nodes terminating a one-way optical path in a direction opposite to a one-way optical path and an optical path monitoring signal. In addition, an optical path monitoring signal in the opposite direction to the optical path monitoring signal of the one-way optical path is transmitted using the signal channel, and a bidirectional optical path monitoring signal is transmitted. Thus, even in a situation where an optical path is set in only one direction, it becomes possible to transmit an optical path monitoring signal in both directions by the added signal channel.
[0012]
For a plurality of one-way optical paths and optical path monitoring signals sharing the same termination point, a plurality of optical path monitoring signals in the opposite direction may be transmitted by sharing a signal channel. Term 2, 5 ).
[0013]
The present invention (claim 3, 6 The method and system for monitoring a wavelength division multiplexing optical communication network according to the first aspect of the present invention provide two-way communication between adjacent optical communication nodes via a wavelength division multiplexing link. One hop An optical path is set, an optical path monitoring signal in the opposite direction to the optical path monitoring signal of the one-way optical path is transmitted using the payload portion, and a bidirectional optical path monitoring signal is transmitted. As a result, even if the optical path is set in only one direction, One hop The optical path monitoring signal can be transmitted bidirectionally using the payload section of the optical path.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
(1st Embodiment)
FIG. 1 shows a first embodiment of a wavelength multiplexing optical communication network monitoring system according to the present invention. The components having the same reference numerals as those of the conventional configuration shown in FIG. 10 have the same functions. Here, as shown in FIG. 11, in a situation where a downstream optical path is set from the optical communication node 103 to the optical communication node 101 and the downstream optical path + optical path monitoring signal 122 is transmitted, the upstream optical path is transmitted. 1 shows a configuration for transmitting an optical path monitoring signal (a backward optical path monitoring signal).
[0023]
In the configuration of the present embodiment, one new signal channel (wavelength) is added to transmit the reverse optical path monitoring signal 201 corresponding to the downstream optical path monitoring signal. In the optical communication nodes 101 and 103, reverse optical path supervisory signal terminating devices 211 and 212 for transmitting and receiving the reverse optical path supervisory signal 201 are arranged.
[0024]
Note that, for a plurality of unidirectional optical paths and optical path monitoring signals sharing the same termination point, a single signal channel is shared and a plurality of reverse paths are shared instead of adding a signal channel to each. The optical path monitoring signal in the direction may be transmitted. In this case, an optical path monitoring signal in the opposite direction may be transmitted to the second and subsequent one-way optical paths and the optical path monitoring signal using, for example, a payload unit.
[0025]
Here, the configuration of each optical communication node, repeater, and each wavelength multiplex link will be summarized. The optical communication node 101 includes a backward optical path supervisory signal terminating device 211, a wavelength multiplexing link / optical communications node supervisory signal terminating device 161 and a wavelength multiplexing link / repeater supervisory signal terminating device 171 in the upstream direction, and in the downstream direction. , An optical path / optical path supervisory signal termination device 154, a wavelength multiplex link / optical communication node supervisory signal termination device 168, and a wavelength multiplex link / repeater supervisory signal termination device 182. Further, each terminating device exchanges information with the control device 191 and performs monitoring and control processing.
[0026]
The optical communication node 102 includes wavelength multiplexing link / optical communication node monitoring signal terminating devices 162 and 163 and wavelength multiplexing link / repeater monitoring signal terminating devices 172 and 173 in the upstream direction. Link / optical communication node monitoring signal termination devices 166 and 167 and wavelength multiplexing link / repeater monitoring signal termination devices 180 and 181 are provided. Further, each terminal device exchanges information with the control device 192 and performs monitoring and control processing.
[0027]
The repeater 104 includes wavelength multiplexing link repeater monitoring signal termination devices 174 and 175 in the upstream direction, and wavelength multiplexing link repeater monitoring signal termination devices 178 and 179 in the downstream direction. Further, each terminal device exchanges information with the control device 193 and performs monitoring and control processing.
[0028]
The optical communication node 103 includes a backward optical path supervisory signal terminating device 212, a wavelength multiplexing link / optical communications node supervisory signal terminating device 164, and a wavelength multiplexing link / repeater supervisory signal terminating device 176 with respect to the upstream direction. , An optical path / optical path supervisory signal termination device 153, a wavelength multiplex link / optical communication node supervisory signal termination device 165, and a wavelength multiplex link / repeater supervisory signal termination device 177. Furthermore, each terminal device exchanges information with the control device 194 and performs monitoring and control processing. Each of the control devices 191 to 194 is connected to the communication network monitoring device 195, and exchanges information with each other.
[0029]
The upstream wavelength multiplexing link 111 has a reverse optical path monitoring signal terminating device 211 of the optical communication node 101 at the transmitting end and a reverse optical path monitoring signal terminating device 212 of the optical communication node 103 at the receiving end. The path monitoring signal 201 and the wavelength whose wavelength is set to the wavelength multiplexing link / optical communication node monitoring signal terminating device 161 of the optical communication node 101 at the transmitting end and to the wavelength multiplexing link / optical communication node monitoring signal terminating device 162 of the optical communication node 102 at the receiving end. The multilink / optical communication node monitoring signal 131, the transmitting end is the wavelength multiplexing link / repeater monitoring signal terminating device 171 of the optical communication node 101, and the receiving end is the wavelength multiplexing link / repeater monitoring signal terminating device 172 of the optical communication node 102. The wavelength multiplex link repeater monitoring signal 141 is set.
[0030]
The uplink wavelength multiplexing link 112 has a reverse optical path monitoring signal 201, a transmission end of the wavelength multiplexing link / optical communication node monitoring signal termination device 163 of the optical communication node 102, and a receiving end of the wavelength multiplexing of the optical communication node 103. A wavelength multiplexing link / optical communication node monitoring signal 132 serving as a link / optical communication node monitoring signal terminating device 164, a wavelength multiplexing link / repeater monitoring signal terminating device 173 of the optical communication node 102 at the transmitting end, and a wavelength of the repeater 104 at the receiving end. A wavelength multiplex link repeater monitor signal 142 to be used as the multi link repeater monitor signal termination device 174 is set.
[0031]
The upstream wavelength multiplexing link 113 includes a reverse optical path monitoring signal 201, a wavelength multiplexing link / optical communication node monitoring signal 132, a wavelength multiplexing link / repeater monitoring signal terminator 175 of the repeater 104, and a receiving end. Is set as the wavelength multiplexing link repeater monitoring signal terminating device 176 of the optical communication node 103.
[0032]
The downstream WDM link 114 has an optical path / optical path supervisory signal terminator 153 of the optical communication node 103 at the transmitting end and an optical path / optical path supervisory signal terminator 154 of the optical communication node 101 at the receiving end. The path + optical path monitoring signal 122, the transmitting end is the wavelength multiplexing link / optical communication node monitoring signal termination device 165 of the optical communication node 103, and the receiving end is the wavelength multiplexing link / optical communication node monitoring signal termination device 166 of the optical communication node 102. The wavelength division multiplex link / optical communication node monitoring signal 133 of the optical communication node 103 at the transmission end, the wavelength division multiplex link / repeater monitoring signal termination device 178 of the repeater 104 at the reception end, Multiplexed link repeater monitoring signal 144 is set.
[0033]
On the downstream wavelength multiplexing link 115, the optical path + optical path monitoring signal 122, the wavelength multiplexing link / optical communication node monitoring signal 133, the transmitting end of the wavelength multiplexing link / repeater monitoring signal terminating device 179 of the repeater 104, and the receiving end A wavelength division multiplex link / repeater monitoring signal 145 having an end at the wavelength division multiplex link / repeater monitoring signal termination device 180 of the optical communication node 102 is set.
[0034]
An optical path + optical path monitor signal 122, a wavelength multiplex link / optical communication node monitor signal termination device 167 of the optical communication node 102 at the transmission end, and a wavelength of the optical communication node 101 A wavelength multiplexing link / optical communication node monitoring signal 134 serving as a multilink / optical communication node monitoring signal terminating device 168, a wavelength multiplexing link / repeater monitoring signal terminating device 181 of the optical communication node 102 at the transmitting end, and an optical communication node at the receiving end. A wavelength multiplex link repeater monitoring signal 146 is set as the wavelength multiplex link repeater monitoring signal terminating device 182 of 101.
[0035]
Here, the transmission and reception operations of the backward optical path supervisory signal terminating devices 211 and 212 will be described with reference to FIG. FIG. 2A shows a configuration example in which an electrical / optical converter 221 is used as the backward optical path supervisory signal terminating device 211 disposed at the transmitting end of the optical communication node 101. The backward optical path monitoring signal 231 of the electric signal output from the control device 191 is converted into the backward optical path monitoring signal 201 of the optical signal (wavelength λsv) by the electric / optical converter 221 and transmitted to the wavelength multiplex link 111. Is done. The wavelength λsv is set to be different from the wavelengths of other optical paths (main signals), wavelength multiplex link / optical communication node monitoring signals, and wavelength multiplex link / repeater monitoring signals.
[0036]
FIG. 2B shows a configuration example using an optical / electrical converter 222 as the backward optical path supervisory signal terminating device 212 disposed at the receiving end of the optical communication node 103. The backward optical path monitoring signal 201 of wavelength λsv, which is demultiplexed from the wavelength multiplexing link 113, is converted into an electrical optical backward optical path monitoring signal 232 by the optical / electrical converter 222 and sent to the control device 194.
[0037]
(Second embodiment)
FIG. 3 shows a second embodiment of the wavelength multiplexing optical communication network monitoring system of the present invention. The components having the same reference numerals as those of the first embodiment shown in FIG. 1 have the same functions. Here, as in the first embodiment, in a situation where a downstream optical path is set from the optical communication node 103 to the optical communication node 101 and only the downstream optical path + optical path monitoring signal 122 is transmitted, A configuration for transmitting an upstream optical path monitoring signal (reverse optical path monitoring signal) is shown. However, since the configuration is the same for the downstream direction, a description thereof is omitted.
[0038]
In the configuration of the present embodiment, in order to transmit a backward optical path monitoring signal corresponding to a downstream optical path monitoring signal, an optical path (one-hop optical path) between adjacent optical communication nodes via a wavelength division multiplex link. Is set, and the backward optical path monitoring signal is stored in the payload of the one-hop optical path and transmitted. These signals are referred to as optical path + reverse optical path monitoring signals 202 and 203. In the optical communication nodes 101 to 103, optical path / reverse optical path monitoring signal terminating devices 213 to 216 for transmitting and receiving the optical path + reverse optical path monitoring signals 202 and 203 are arranged.
[0039]
Since the one-hop optical path is terminated at each optical communication node, for example, by assigning an address to the backward optical path monitoring signal and routing the signal by the control device of each optical communication node, the target optical communication node (downlink direction) Is set to be transmitted to the optical communication node 103), which is the transmission end of the optical path.
[0040]
(Third Embodiment : Reference example )
FIG. 4 shows a third embodiment of the wavelength multiplexing optical communication network monitoring system according to the present invention. (Reference example) Is shown. The components having the same reference numerals as those of the first embodiment shown in FIG. 1 have the same functions. Here, similarly to the first embodiment and the second embodiment, the portion relating to the down direction is omitted.
[0041]
In the configuration of the present embodiment, the reverse optical path monitor signal corresponding to the downstream optical path monitor signal is multiplexed with the wavelength multiplex link / optical communication node monitor signal, and both monitor signals are transmitted on the same signal channel. This signal is referred to as a backward optical path monitoring signal + wavelength multiplex link / optical communication node monitoring signal 301, 302. In the optical communication nodes 101 to 103, a reverse optical path monitoring signal / wavelength multiplex link / optical communication node monitoring signal terminating device 311 for transmitting / receiving a reverse optical path monitoring signal + wavelength multiplex link / optical communication node monitoring signals 301 and 302 is provided. To 314.
[0042]
Note that the monitoring system of the present embodiment is used when both the wavelength multiplex link / optical communication node monitoring signal and the wavelength multiplex link / repeater monitoring signal exist, or when only the wavelength multiplex link / optical communication node monitoring signal exists. Applicable to both.
[0043]
Hereinafter, in the description of the present embodiment, the monitoring signals 301 and 302 and the terminating devices 311 to 314 are simply referred to. The transmission / reception operations of the terminating devices 311 to 314 will be described with reference to FIG.
[0044]
FIG. 5A shows a configuration example in which a multiplexer 321 and an electrical / optical converter 322 in the electrical stage are used as the terminating devices 311 and 313 disposed at the transmission ends of the optical communication nodes 101 and 102. The backward optical path monitor signal 331 and the wavelength multiplex link / optical communication node monitor signal 332 of the electric signal output from the controllers 191 and 192 are multiplexed by the multiplexer 321 to monitor the backward optical path of the electric signal. A signal + wavelength multiplex link / optical communication node monitoring signal 333 is generated. The backward optical path monitoring signal + wavelength multiplex link / optical communication node monitoring signal 333 of the electrical signal is converted into monitoring signals 301 and 302 of optical signals (wavelength λsv) by the electrical / optical converter 322, and the wavelength multiplexing link 111. , 112. The wavelength λsv is set to be different from the wavelength of another optical path (main signal) or the wavelength multiplex link / repeater monitoring signal.
[0045]
FIG. 5B shows a configuration example in which an optical / electrical converter 323 and an electric-stage demultiplexer 324 are used as the terminating devices 312 and 314 arranged at the receiving ends of the optical communication nodes 102 and 103. The monitoring signals 301 and 302 of the wavelength λsv demultiplexed from the wavelength multiplexing links 111 and 113 are converted by an optical / electrical converter 323 into a reverse optical path monitoring signal of an electrical signal + a wavelength multiplexing link / optical communication node monitoring signal 334. Is done. This signal is further separated by a demultiplexer 324 into a reverse optical path monitoring signal 335 and a wavelength multiplexing link / optical communication node monitoring signal 336 of an electric signal, and sent to the controllers 192 and 194.
[0046]
(Fourth embodiment : Reference example )
FIG. 6 is a fourth embodiment of the wavelength multiplexing optical communication network monitoring system according to the present invention. (Reference example) Is shown. The components having the same reference numerals as those of the first embodiment shown in FIG. 1 have the same functions. Here, similarly to the first to third embodiments, a portion related to the down direction is omitted.
[0047]
In the configuration of the present embodiment, a reverse optical path monitor signal corresponding to a downstream optical path monitor signal is multiplexed on a wavelength division multiplex link / repeater monitor signal, and both monitor signals are transmitted on the same signal channel. This signal is referred to as a reverse optical path monitor signal + wavelength multiplex link repeater monitor signal 401-403. The optical communication nodes 101 to 103 and the repeater 104 are provided with reverse optical path monitor signals / wavelength multiplex link repeater monitor signal terminating devices 411 to 411 for transmitting and receiving reverse optical path monitor signals + wavelength multiplex link repeater monitor signals 401 to 403. 416 is arranged. However, in the repeater 104, a control line 417 for passing the reverse optical path monitor signal is provided between the reverse optical path monitor signal / wavelength multiplexing link repeater monitor signal terminating devices 414 and 415.
[0048]
The monitoring system according to the present embodiment can be used in the case where both the wavelength multiplex link / optical communication node monitoring signal and the wavelength multiplex link / repeater monitoring signal exist, or in the case where only the wavelength multiplex link / repeater monitoring signal exists. Is also applicable.
[0049]
Hereinafter, in the description of the present embodiment, the monitoring signals 401 to 403 and the terminating devices 411 to 416 are simply referred to. With reference to FIG. 7, the transmission / reception operations of the terminating devices 411 to 416 will be described.
[0050]
FIG. 7A shows a configuration example in which an electric / optical converter 421 and an optical modulator 422 are used as the terminating devices 411 and 413 arranged at the transmission ends of the optical communication nodes 101 and 102. The backward optical path monitoring signal 431 of the electric signal output from the control devices 191 and 192 is converted by the electrical / optical converter 421 into the backward optical path monitoring signal 432 of the optical signal (wavelength λsv). The wavelength λsv is set to be different from the wavelength of another optical path (main signal) or the wavelength multiplex link / optical communication node monitoring signal. The optical modulator 422 modulates the backward optical path monitoring signal 432 of the optical signal with the wavelength multiplex link / repeater monitoring signal 433 of the electric signal output from the controllers 191 and 192, and monitors the optical signal monitoring signals 401 and 402. Is generated and transmitted to the wavelength multiplexing links 111 and 112.
[0051]
FIG. 7B shows a configuration example in which an optical signal distributor 423, an optical / electrical converter 424, and an optical demodulator 425 are used as terminating devices 412, 416 arranged at the receiving ends of the optical communication nodes 102, 103. Show. The monitoring signals 401 and 403 of the wavelength λsv demultiplexed from the wavelength multiplexing links 111 and 113 are divided into two by the optical signal distributor 423 and input to the optical / electrical converter 424 and the optical demodulator 425, respectively. The optical / electrical converter 424 converts the monitoring signals 401 and 403 into a reverse optical path monitoring signal 434 of an electrical signal, and sends out the signals to the controllers 192 and 194. The optical demodulator 425 reproduces the wavelength-division multiplex link / repeater monitoring signal 435 of the electric signal from the monitoring signals 401 and 403, and sends out the signals to the controllers 192 and 194.
[0052]
FIG. 7C shows a configuration example using an optical signal distributor 423, an optical / electrical converter 424, and an optical demodulator 425 as a terminating device 414 disposed at the receiving end of the repeater 104, and disposed at the transmitting end. A configuration example using an electrical / optical converter 421 and an optical modulator 422 as the termination device 415 is shown. The optical / electrical converter 424 and the electric / optical modulator 421 are connected via a control line 417.
[0053]
The monitor signal 402 having the wavelength λsv, which is demultiplexed from the wavelength multiplex link 112, is divided into two by the optical signal distributor 423, and is input to the optical / electrical converter 424 and the optical demodulator 425, respectively. The optical / electrical converter 424 converts the monitor signal 402 into a reverse optical path monitor signal 434 of the electric signal, sends the signal to the electric / optical converter 421 via the control line 417, and reverses the optical signal (wavelength λsv) again. It is converted into a direction optical path monitor signal 432. Thereby, the modulation component due to the wavelength multiplex link repeater monitoring signal is removed. The optical demodulator 425 reproduces the wavelength division multiplex link repeater monitoring signal 435 of the electric signal from the monitoring signal 402 and sends it to the control device 193. The optical modulator 422 converts the backward optical path monitoring signal 432 of the optical signal (wavelength λsv) output from the electrical / optical converter 421 into the wavelength multiplexing link repeater monitoring signal 433 of the electrical signal output from the control device 193. , And generates a monitoring signal 403 of the optical signal and transmits it to the wavelength multiplexing link 113.
[0054]
In the third embodiment, a reverse optical path monitoring signal and a wavelength multiplexing link / optical communication node monitoring signal are multiplexed at an electric stage and transmitted on the same signal channel. In the fourth embodiment, a reverse optical path monitoring signal and a wavelength division multiplex link / repeater monitoring signal are multiplexed at an optical stage and transmitted on the same signal channel. The respective multiplexing methods are interchangeable, and the third embodiment may be configured to multiplex at the optical stage, or the fourth embodiment may be configured to multiplex at the electric stage.
[0055]
(Fifth Embodiment : Reference example )
FIG. 8 shows a fifth embodiment of the wavelength multiplexing optical communication network monitoring system according to the present invention. (Reference example) Is shown. The components having the same reference numerals as those of the first embodiment shown in FIG. 1 have the same functions. Here, similarly to the first to fourth embodiments, the parts related to the down direction are omitted.
[0056]
In the configuration of the present embodiment, a reverse optical path monitoring signal corresponding to a downstream optical path monitoring signal is multiplexed into a wavelength multiplexing link / optical communication node monitoring signal and a wavelength multiplexing link / repeater monitoring signal, and each monitoring signal is multiplexed. Transmit on the same signal channel. This signal is referred to as a reverse optical path monitor signal + wavelength multiplex link / optical communication node monitor signal + wavelength multiplex link / repeater monitor signal 501-503. The optical communication nodes 101 to 103 and the repeater 104 receive reverse optical path monitor signals / wavelength multiplex link / optical communication node monitor signals + wavelength multiplex link / repeater monitor signals 501 to 503. The multilink / optical communication node monitoring signal / wavelength multiplex link / repeater monitoring signal terminating devices 511 to 516 are arranged. However, in the repeater 104, the reverse optical path supervisory signal and the wavelength multiplex link / optical signal are transmitted between the reverse optical path supervisory signal / wavelength multiplex link / optical communication node supervisory signal / wavelength multiplex link / repeater supervisory signal terminator 514,515. Control lines 517 and 518 for passing the communication node monitoring signal are provided.
[0057]
Hereinafter, in the description of the present embodiment, the monitoring signals 501 to 503 and the terminating devices 511 to 516 are simply referred to. With reference to FIG. 9, the transmission / reception operations of the terminating devices 511 to 516 will be described. Here, an example in which three monitoring signals are multiplexed in the electric stage is shown, but a method of combining the multiplexing method of the electric stage and the optical stage (a combination of the third embodiment and the fourth embodiment) is employed. It is also possible.
[0058]
FIG. 9A shows a configuration example in which a multiplexer 521 and an electrical / optical converter 522 in an electric stage are used as terminating devices 511 and 513 arranged at the transmission ends of the optical communication nodes 101 and 102. The reverse optical path monitor signal 531, the wavelength multiplex link / optical communication node monitor signal 532, and the wavelength multiplex link / repeater monitor signal 533 of the electrical signals output from the control devices 191 and 192 are multiplexed by the multiplexer 521. , An electrical signal reverse optical path monitoring signal + wavelength multiplex link / optical communication node monitoring signal + wavelength multiplex link / repeater monitoring signal 534 is generated. The electric signal is converted into monitoring signals 501 and 502 of optical signals (wavelength λsv) by the electric / optical converter 522 and transmitted to the wavelength multiplexing links 111 and 112. The wavelength λsv is set to be different from the wavelength of another optical path (main signal).
[0059]
FIG. 9B shows a configuration example in which an optical / electrical converter 523 and a demultiplexer 524 in the electric stage are used as the terminating devices 512 and 516 disposed at the receiving ends of the optical communication nodes 102 and 103. The monitoring signals 501 and 503 of the wavelength λsv demultiplexed from the wavelength multiplexing links 111 and 113 are converted by the optical / electrical converter 523 into a reverse optical path monitoring signal of an electrical signal + a wavelength multiplexing link / optical communication node monitoring signal + wavelength multiplexing. It is converted into a link repeater monitoring signal 535. This signal is further separated by a demultiplexer 524 into a backward optical path monitor signal 536 of an electrical signal, a wavelength multiplex link / optical communication node monitor signal 537 and a wavelength multiplex link / repeater monitor signal 538. Sent to
[0060]
FIG. 9C shows a configuration example in which an optical / electrical converter 523 and a demultiplexer 524 in an electric stage are used as a terminating device 514 arranged at the receiving end of the repeater 104, and a terminating device arranged at the transmitting end. Reference numeral 515 shows a configuration example using the multiplexer 521 and the electrical / optical converter 522 in the electric stage. Note that the demultiplexer 524 and the multiplexer 521 are connected via control lines 517 and 518.
[0061]
The monitoring signal 502 of the wavelength λsv, which is demultiplexed from the wavelength multiplexing link 112, is monitored by the optical / electrical converter 523 in the reverse direction of the electrical signal monitoring signal + wavelength multiplex link / optical communication node monitoring signal + wavelength multiplexing link / repeater monitoring It is converted to a signal 535. This signal is further separated by a demultiplexer 524 into a backward optical path monitor signal 536 of an electrical signal, a wavelength multiplex link / optical communication node monitor signal 537, and a wavelength multiplex link / repeater monitor signal 538. Among them, the wavelength multiplex link repeater monitoring signal 538 is sent to the control device 193 to be terminated at the repeater 104.
[0062]
The reverse optical path monitor signal 536 and the wavelength multiplex link / optical communication node monitor signal 537 are sent to the multiplexer 521 via control lines 517 and 518. The multiplexer 521 multiplexes the reverse optical path monitor signal 536 and the wavelength multiplex link / optical communication node monitor signal 537 and the wavelength multiplex link / repeater monitor signal 533 of the electric signal output from the controller 193. , An electrical signal reverse optical path monitoring signal + wavelength multiplex link / optical communication node monitoring signal + wavelength multiplex link / repeater monitoring signal 534 is generated. This electric signal is converted into a monitor signal 503 of an optical signal (wavelength λsv) by the electric / optical converter 522 and transmitted to the wavelength multiplex link 113. The wavelength λsv is set to be different from the wavelength of another optical path (main signal).
[0063]
【The invention's effect】
As described above, the monitoring method and the monitoring system for the wavelength division multiplexing optical communication network according to the present invention provide a method for adding a signal channel or for controlling the addition of a signal channel even if the optical path set between any two optical communication nodes is unidirectional. By transmitting the optical path monitoring signal in the opposite direction using the payload portion of the hop optical path, it is possible to transmit the optical path monitoring signal in both directions.
[0065]
Therefore, no matter what optical path is set in the WDM optical communication network, it is possible to reliably monitor each optical path in the WDM optical communication network as a whole.
[Brief description of the drawings]
FIG. 1 is a diagram showing a first embodiment of a wavelength multiplexing optical communication network monitoring system according to the present invention.
FIG. 2 is a diagram showing a configuration example of reverse optical path supervisory signal termination devices 211 and 212 according to the first embodiment.
FIG. 3 is a diagram showing a second embodiment of the wavelength multiplexing optical communication network monitoring system of the present invention.
FIG. 4 is a diagram showing a third embodiment of the wavelength multiplexing optical communication network monitoring system of the present invention.
FIG. 5 is a diagram illustrating a configuration example of terminal devices 311 to 314 according to the third embodiment.
FIG. 6 is a diagram showing a fourth embodiment of the wavelength multiplexing optical communication network monitoring system of the present invention.
FIG. 7 is a diagram illustrating a configuration example of termination devices 411 to 416 according to a fourth embodiment.
FIG. 8 is a diagram showing a fifth embodiment of the wavelength multiplexing optical communication network monitoring system of the present invention.
FIG. 9 is a diagram illustrating a configuration example of terminal devices 511 to 516 according to a fifth embodiment.
FIG. 10 is a diagram showing a configuration example of a conventional monitoring system for a wavelength division multiplexing optical communication network.
FIG. 11 is a diagram showing an example of the configuration of a conventional wavelength multiplexing optical communication network monitoring system in which a one-way optical path is set between optical communication nodes.
[Explanation of symbols]
101-103 Optical communication node
104 repeater
111-116 WDM link
121, 122 optical path + optical path monitoring signal
131-134 WDM link / optical communication node monitoring signal
141 to 146 WDM link repeater monitor signal
151-154 Optical path / optical path monitoring signal termination device
161 to 168 WDM link / optical communication node monitoring signal termination device
171 to 182 WDM link repeater supervisory signal termination device
191 to 194 control device
195 Communication network monitoring device
201 Reverse optical path monitoring signal
202, 203 optical path + reverse optical path monitoring signal
211, 212 Reverse optical path monitoring signal termination device
221 Electric / optical converter
222 optical / electrical converter
301 Reverse optical path monitoring signal + WDM link / optical communication node monitoring signal
311 to 314 Reverse optical path supervisory signal / wavelength multiplex link / optical communication node supervisory signal termination device
321 multiplexer
322 Electric / optical converter
323 optical / electrical converter
324 demultiplexer
401 to 403 Reverse optical path monitor signal + wavelength multiplex link repeater monitor signal
411-416 Reverse optical path supervisory signal / wavelength multiplex link repeater supervisory signal termination device
417 Control line
421 Electric / optical converter
422 optical modulator
423 Optical signal distributor
424 Optical / electrical converter
425 optical demodulator
501 to 503 Reverse optical path monitor signal + wavelength multiplex link / optical communication node monitor signal + wavelength multiplex link / repeater monitor signal
511-516 Reverse optical path supervisory signal / wavelength multiplex link / optical communication node supervisory signal / wavelength multiplex link / repeater supervisory signal termination device
517,518 control line
521 multiplexer
522 Electric / optical converter
523 Optical / electrical converter
524 demultiplexer

Claims

In a wavelength multiplexing optical communication network in which a one-way optical path is set between any two optical communication nodes connected via a wavelength multiplexing link and an optical path monitoring signal is set in the same direction as the optical path,
Between the two optical communication nodes terminating the one-way optical path, a signal channel is added in the opposite direction to the one-way optical path and the optical path monitoring signal, and the one-way optical path is used by using the signal channel. A method for monitoring a wavelength division multiplexed optical communication network, comprising transmitting an optical path supervisory signal in a direction opposite to an optical path supervisory signal of an optical path, and transmitting a bidirectional optical path supervisory signal.

The method for monitoring a wavelength division multiplexing optical communication network according to claim 1,
Wavelength multiplexing optical communication, wherein a plurality of optical path monitoring signals in the opposite direction are transmitted by sharing the signal channel for a plurality of one-way optical paths and optical path monitoring signals sharing the same terminal point. How to monitor the web.

In a wavelength multiplexing optical communication network in which a one-way optical path is set between any two optical communication nodes connected via a wavelength multiplexing link and an optical path monitoring signal is set in the same direction as the optical path,
Using payload of 1 hop optical path of a bidirectional set between the optical communication nodes adjacent via the wavelength multiplexing link, reverse optical path supervisory signal for optical path supervisory signal of the one-way light path And transmitting a bidirectional optical path monitoring signal.

A wavelength multiplexing optical communication network monitoring system in which a one-way optical path is set between any two optical communication nodes connected via a wavelength multiplexing link, and an optical path monitoring signal is set in the same direction as the optical path. At
The two optical communication nodes terminating the one-way optical path are provided with means for setting a signal channel in the opposite direction to the one-way optical path and the optical path monitoring signal, and using the signal channel to set the one-way optical path. A monitoring system for a wavelength division multiplexed optical communication network, wherein the monitoring system is configured to transmit an optical path monitoring signal in a direction opposite to an optical path monitoring signal of a direction optical path.

The wavelength multiplexing optical communication network monitoring system according to claim 4,
For a plurality of unidirectional optical paths and optical path monitoring signals sharing the same termination point, the configuration is such that a set signal channel is shared to transmit a plurality of reverse optical path monitoring signals. Wavelength multiplexing optical communication network monitoring system.

A wavelength multiplexing optical communication network monitoring system in which a one-way optical path is set between any two optical communication nodes connected via a wavelength multiplexing link, and an optical path monitoring signal is set in the same direction as the optical path. At
Means for setting a bidirectional one-hop optical path in each optical communication node between two optical communication nodes terminating the one-way optical path, and using the payload portion of the optical communication node, A monitoring system for a wavelength division multiplexed optical communication network, wherein the monitoring system is configured to transmit an optical path monitoring signal in a direction opposite to the path monitoring signal.