JPS6358496B2 - - Google Patents
Info
- Publication number
- JPS6358496B2 JPS6358496B2 JP57065885A JP6588582A JPS6358496B2 JP S6358496 B2 JPS6358496 B2 JP S6358496B2 JP 57065885 A JP57065885 A JP 57065885A JP 6588582 A JP6588582 A JP 6588582A JP S6358496 B2 JPS6358496 B2 JP S6358496B2
- Authority
- JP
- Japan
- Prior art keywords
- optical
- light
- signal
- modulation
- receiving element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/27—Arrangements for networking
Landscapes
- Engineering & Computer Science (AREA)
- Computing Systems (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Small-Scale Networks (AREA)
- Optical Communication System (AREA)
Description
【発明の詳細な説明】
本発明は各種デイジタル信号の情報を複数個所
の端末に分配したり、端末から入力して他の端末
間との間で授受する情報網を形成する光ネツトワ
ークを提供するものであり、これはビル内あるい
はビル間の情報管理、情報サービスとしてのOA
（オフイスオートメーシヨン）、工場データ情報網
としての産業用F.O（フアクトリオートメーシヨ
ン）、さらにはまた交通情報網など光技術を用い
る各種情報網分野に適用可能なものである。[Detailed Description of the Invention] The present invention provides an optical network that distributes various types of digital signal information to multiple terminals, and forms an information network in which information is input from a terminal and exchanged between other terminals. This is information management within a building or between buildings, and OA as an information service.
It can be applied to various information network fields using optical technology, such as office automation (office automation), industrial FO (factory automation) as a factory data information network, and even traffic information networks.
従来、電気線を用いたネツトワークでは信号の
高速性、広帯域性に限界があり、光フアイバ方式
では各端末のカスケード接続構成において通常光
電、電光変換による中継を必要とし、さらに中継
部で光信号を通過させる場合に可動式光スイツチ
を要し、この信頼性と特性の安定化に対する配慮
が必要であつた。 Conventionally, networks using electric wires have limitations in signal speed and broadband performance, while optical fiber systems usually require relaying using photoelectric and electro-optical conversion in a cascade connection configuration of each terminal, and furthermore, the relay section requires optical signal conversion. A movable optical switch was required to allow the light to pass through, and consideration had to be given to the reliability and stabilization of the characteristics.
本発明は上記従来技術に鑑み、多量の情報を複
数の端末間で授受するためのネツトワークにおい
て、光フアイバによる広帯域性と電気光学式の光
機能素子を有機的に複合化し、信号切換、信号変
調、信号受信などの機能を非可動式で実現するこ
とを目的とする。また本発明は、複数端末のうち
各端末が任意の時刻に自由自在に伝送回線を利用
可能にする光ネツトワークの実現をはかることを
目的とするものであり、さらに本発明は、各端末
は必ずしも中継機能を有することなく特定の端末
にのみ発光源を設ければよいなど光送受信部構成
における信頼性の向上および構成が単純化した光
ネツトワークの実現を目的とする。 In view of the above-mentioned prior art, the present invention organically combines the broadband performance of optical fibers and electro-optic optical functional elements in a network for transmitting and receiving a large amount of information between multiple terminals, and provides signal switching and signal processing. The purpose is to realize functions such as modulation and signal reception in a non-movable manner. Another object of the present invention is to realize an optical network in which each terminal among a plurality of terminals can freely use a transmission line at any time. The purpose of this invention is to improve the reliability of the optical transmitter/receiver configuration and to realize an optical network with a simplified configuration, such as by providing a light emitting source only in a specific terminal without necessarily having a relay function.
以下本発明の一実施例を図面とともに説明す
る。第１図は本発明の一実施例の光ネツトワーク
を示すものであり、光センターステーシヨンＣか
ら常時光をネツトワークに送り、各光リモートス
テーシヨンR1やR2では、発光素子を用いないで、
その光を変調して前記ネツトワークへ信号を送
る。そのときに受信する光に信号が重畳している
かどうかを検出し、各ステーシヨンから信号を重
畳してもよいかどうかを判断している。 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an optical network according to an embodiment of the present invention, in which light is constantly sent to the network from an optical center station C, and no light emitting element is used at each optical remote station R1 and R2 . ,
The light is modulated and sent to the network. It detects whether a signal is superimposed on the light received at that time, and determines whether it is okay to superimpose a signal from each station.
第１図において、光リモートステーシヨンR1，
R2および光センターステーシヨンＣがそれぞれ
光フアイバF1，F2およびF3でループ状に構成さ
れている。光リモートステーシヨンR1には、光
分岐変調受光素子１が備えられ、その光入力部が
光フアイバF1に、光主出力部が光フアイバF2に
おのおの光結合されている。 In FIG. 1, optical remote stations R 1 ,
R 2 and optical center station C are constructed in a loop with optical fibers F 1 , F 2 and F 3 , respectively. The optical remote station R1 is equipped with an optical branch modulation light receiving element 1, whose optical input part is optically coupled to the optical fiber F1 , and its optical main output part is optically coupled to the optical fiber F2 .
光分岐変調受光素子１の受光部出力電極１７，
１８から出力信号回路２、信号判別回路３、入力
信号起動回路４へとそれぞれカスケードに接続さ
れた回路構成と、入力信号回路５、入力開閉回路
６、変調回路７へとカスケードに接続され、変調
回路７の出力が光分岐変調受光素子１の変調用電
極１４，１５に接続されている。光リモートステ
ーシヨンR2の内部も光リモートステーシヨンR1
と同一に構成されている。また、光センターステ
ーシヨンＣは、光フアイバF3が受光素子１′の光
入力部に結合され、光フアイバF1が光分岐変調
受光素子１の光主出力部に結合され、光分岐変調
受光素子１の光入力部に発光素子８からの光が結
合されている。 light receiving part output electrode 17 of the light branching modulation light receiving element 1;
The circuit configuration is connected in cascade from 18 to output signal circuit 2, signal discrimination circuit 3, and input signal activation circuit 4, respectively, and connected in cascade to input signal circuit 5, input switching circuit 6, and modulation circuit 7, and modulation. The output of the circuit 7 is connected to the modulation electrodes 14 and 15 of the light branching modulation light receiving element 1. Inside of Optical Remote Station R 2 Also of Optical Remote Station R 1
is configured the same as. Further, in the optical center station C, the optical fiber F3 is coupled to the light input part of the light receiving element 1', the optical fiber F1 is coupled to the light main output part of the light branching modulation light receiving element 1, and the optical fiber F3 is coupled to the light main output part of the light branching modulation light receiving element 1. Light from the light emitting element 8 is coupled to one optical input section.
次に第１図に構成される光分岐変調受光素子１
の機能を実現するための光複合機能素子の構成例
を第２図に示す。光分岐変調受光素子１は第１の
導波路１１、第２の導波路１２、回折格子１３、
導波路１１および１２用の外部電圧印加用の電極
１４および１５、回折格子１３の光出力部に設け
られた受光素子１６、その電極１７，１８が一体
に構成されている。光分岐変調受光素子１、導波
路１１の光入力側に光フアイバF1、導波路１１
の光主出力側に光フアイバF2がそれぞれ光結合
される。 Next, the optical splitting modulation light receiving element 1 configured as shown in FIG.
FIG. 2 shows an example of the configuration of an optical multi-functional device for realizing the functions described above. The optical splitting modulation light receiving element 1 includes a first waveguide 11, a second waveguide 12, a diffraction grating 13,
Electrodes 14 and 15 for applying external voltages to the waveguides 11 and 12, a light receiving element 16 provided at the light output portion of the diffraction grating 13, and its electrodes 17 and 18 are integrally constructed. An optical fiber F 1 and a waveguide 11 are provided on the optical input side of the optical branching modulation light receiving element 1 and the waveguide 11.
An optical fiber F2 is optically coupled to the main optical output side of each.
次に動作について説明する。光フアイバF1か
ら入力された光は電極１４，１５に印加される電
圧による第１の状態で第１の導波路１１を通つて
光フアイバF2に光出力される。電極１４，１５
に印加される電圧による第２の状態では、入力さ
れた光が導波路１１から導波路１２に移動し、回
折格子１３を経て受光素子１６に伝えられる。こ
こで電極１４，１５に印加する電圧を第１と第２
の状態に交互に変えると、光フアイバF1から入
力される光が一定レベルであれば、光フアイバ
F2に出力される光はパルス状に変化する。すな
わち、パルス変調が行なわれる。電極１４，１５
に印加する電圧が第１と第２の状態の中間の値に
設定されるとその電圧値に応じて光フアイバF1
から光フアイバF2への光は受光素子１６の方に
光分岐される。 Next, the operation will be explained. The light input from the optical fiber F 1 is outputted to the optical fiber F 2 through the first waveguide 11 in a first state due to the voltage applied to the electrodes 14 and 15 . Electrodes 14, 15
In the second state due to the voltage applied to the waveguide 11 , the input light moves from the waveguide 11 to the waveguide 12 and is transmitted to the light receiving element 16 via the diffraction grating 13 . Here, the voltages applied to the electrodes 14 and 15 are set to the first and second voltages.
If the light input from optical fiber F1 is at a constant level, the optical fiber will
The light output to F2 changes in a pulsed manner. That is, pulse modulation is performed. Electrodes 14, 15
When the voltage applied to F 1 is set to a value intermediate between the first and second states, the optical fiber F 1
The light from the optical fiber F 2 is branched toward the light receiving element 16 .
つづいて、第１図の構成について動作を説明す
る。光フアイバF1から光リモートステーシヨン
R1の光分岐変調受光素子１へ光入力されると、
分岐変調用の電極１４，１５の印加電圧により光
分岐されて一部の光が受光部電極１７，１８から
電気信号として出力される。この信号が出力信号
回路２により出力されるとともに信号判別回路３
に伝えられる。ここで変化のない信号であること
が判定されると、光リモートステーシヨンR1か
ら信号を送信し得ることになり、入力信号起動回
路４が動作し、入力信号回路５からの送信々号が
入力開閉回路６に伝えられる。信号判別回路３に
より入力開閉回路６が開状態になり変調回路７に
より光分岐変調受光素子１が外部変調される。こ
の結果、光フアイバF2への光出力は変調された
光信号が出力される。次の光リモートステーシヨ
ンR2では、光入力部にすでに変調された光信号
が入力されるため、一部分岐された光信号が出力
信号回路２を経て信号判別回路３により変化信号
ありと判別され、入力信号起動回路４を作動させ
ず、また、入力開閉回路６を閉の状態に保つこと
になる。 Next, the operation of the configuration shown in FIG. 1 will be explained. Optical Fiber F 1 to Optical Remote Station
When light is input to the optical branching modulation light receiving element 1 of R1 ,
The light is branched by the voltage applied to the branching modulation electrodes 14 and 15, and a portion of the light is output from the light receiving section electrodes 17 and 18 as an electrical signal. This signal is outputted by the output signal circuit 2 and the signal discrimination circuit 3
can be conveyed to. If it is determined that the signal does not change, the signal can be transmitted from the optical remote station R1 , the input signal activation circuit 4 operates, and the transmitted signal from the input signal circuit 5 is input. It is transmitted to the switching circuit 6. The signal discrimination circuit 3 turns the input switching circuit 6 into an open state, and the modulation circuit 7 externally modulates the optical branching modulation light receiving element 1. As a result, a modulated optical signal is outputted to the optical fiber F2 . In the next optical remote station R 2 , the optical signal that has already been modulated is input to the optical input section, so the partially branched optical signal passes through the output signal circuit 2 and is determined by the signal discrimination circuit 3 as having a change signal. The input signal activation circuit 4 is not activated, and the input switching circuit 6 is kept closed.
以上のごとく各光リモートステーシヨンR1，
R2は、入力光がすでに信号形状のものであれば
外部信号の受信のみの機能を行い、自己の信号を
送信せず、入力光が変化のない一定光であれば自
己の信号を入力して送信する。ここで光センター
ステーシヨンＣにおいては、発光素子８が本ルー
プ状光ネツトワークの光源となり一定レベルの光
を送出している。 As mentioned above, each optical remote station R1 ,
R 2 functions only to receive external signals if the input light is already in the form of a signal, and does not transmit its own signal; if the input light is constant light without change, it will input its own signal. and send. Here, in the optical center station C, the light emitting element 8 serves as the light source of this loop-shaped optical network and sends out light at a constant level.
以上の動作説明においては光リモートステーシ
ヨンあるいは光センターステーシヨンで送出信号
を伝送しようとすれば、その光ステーシヨンに入
力される光が未変調の一定レベルであることを確
認、判別してはじめて行える。次に別の動作様態
を本構成にて行う場合について説明する。光セン
ターステーシヨンＣから光リモートステーシヨン
R1あるいはR2へアドレスなどの信号を伝達し、
返信のためのタイムスロツトを割当てた情報伝送
方法においては、信号判別回路３で該当信号を判
別して、入力開閉回路６を開き、入力信号起動回
路４を動作させてデータの交換を行わすことがで
きる。 In the above operation description, if an optical remote station or an optical center station is to transmit an outgoing signal, it can only be done after confirming and determining that the light input to the optical station is unmodulated and at a constant level. Next, a case where another operation mode is performed with this configuration will be described. From optical center station C to optical remote station
Transmit signals such as address to R 1 or R 2 ,
In the information transmission method in which a time slot is assigned for a reply, the signal discrimination circuit 3 discriminates the corresponding signal, opens the input switching circuit 6, and operates the input signal activation circuit 4 to exchange data. Can be done.
光センターステーシヨンＣでは、発光素子８で
ネツトワーク全体の光源を全て送り出すととも
に、光リモートステーシヨンＲからの信号を中継
する動作を行う。 In the optical center station C, the light emitting element 8 sends out all the light sources of the entire network, and also performs the operation of relaying signals from the optical remote station R.
なお、光センターステーシヨンＣにおける光分
岐変調受光素子１は光リモートステーシヨンにお
ける光分岐変調受光素子１とはその構成が異な
り、受光素子部がなくてもよい。 Note that the optical branching modulation light receiving element 1 in the optical center station C has a different configuration from the optical branching modulation light receiving element 1 in the optical remote station, and may not include a light receiving element section.
以上の説明から明らかなように本発明において
は、ネツトワークの光伝送用光源を１カ所に設け
ればよく系全体の光能動部品の数が少なく、単純
化され、信頼性の向上が可能となる。また光リモ
ートステーシヨンにおける光の切換、分配、受
光、導波などの機能が全電子式、光学式となり機
構部、可動部がなく安定な動作が実現できる。さ
らに、ネツトワークの情報伝達として本方式によ
れば任意の時刻に任意の光リモートステーシヨン
から必要に応じて信号を発信でき、複数の光リモ
ートステーシヨンから同時に信号送信するような
衝突防止が行えて、効率のよい伝送ができる。ま
た光リモートステーシヨンの電気回路部分に故障
を生じても第１の導波路を通過するので次段への
光信号の伝送に支障を起さない。 As is clear from the above description, in the present invention, the light source for optical transmission of the network need only be provided at one location, and the number of optically active parts in the entire system is small, simplifying the system and improving reliability. Become. In addition, functions such as light switching, distribution, light reception, and waveguide in the optical remote station are all electronic and optical, and there are no mechanical or moving parts, allowing stable operation. Furthermore, according to this method for network information transmission, signals can be transmitted as needed from any optical remote station at any time, and collision prevention such as simultaneous signal transmission from multiple optical remote stations can be performed. Enables efficient transmission. Furthermore, even if a failure occurs in the electrical circuit portion of the optical remote station, the signal passes through the first waveguide, so there is no problem in transmitting the optical signal to the next stage.
第１図は本発明の一実施例における光ネツトワ
ークの構成図、第２図は第１図の要部構成図であ
る。
R1，R2……光リモートステーシヨン、Ｃ……
光センターステーシヨン、F1，F2，F3……光フ
アイバ、１……光分岐変調受光素子、１′……受
光素子、１１……第１の導波路、１２……第２の
導波路、１３……回折格子、１６……受光素子。
FIG. 1 is a block diagram of an optical network according to an embodiment of the present invention, and FIG. 2 is a block diagram of the main parts of FIG. R 1 , R 2 ... Optical remote station, C ...
Optical center station, F 1 , F 2 , F 3 ... optical fiber, 1 ... light branching modulation light receiving element, 1' ... light receiving element, 11 ... first waveguide, 12 ... second waveguide , 13...diffraction grating, 16... light receiving element.
Claims (1)
通過および光路を変位せしめる機能と、変位によ
り光を側路して受光素子に導く機能を有し、変調
用電気信号が入射光の通過量の変化として光信号
となし得る光分岐変調受光素子と、発光素子と、
受光素子を具備する光センターステーシヨンと、
複数の光リモートステーシヨンを光フアイバでル
ープ状に接続してネツトワークを形成し、前記光
センターステーシヨンにおいては前記光分岐変調
受光素子と受光素子は光学的に非接続であり、送
信しないときは前記発光素子からの光を無変調
で、送信するときは前記発光素子の光を変調して
前記ネツトワークに印加し、前記光リモートステ
ーシヨンにおいては少なくとも光分岐変調受光素
子を具備し、前記ネツトワークの光信号を前記光
分岐変調受光素子で受信し無信号であるかどうか
を判別する手段を設け、送信時は前記判別手段で
無信号であることを確認し、前記光分岐変調受光
素子で入射光を変調し、受信動作は前記判別手段
を介して信号のあることを確認して開始すること
により任意の光ステーシヨン同士の間で情報の送
受を行ない相互交信することを特徴とする光ネツ
トワーク。1 At least the function of passing the incident light and displacing the optical path according to the electrical signal for modulation, and the function of bypassing the light and guiding it to the light receiving element by the displacement, and the electrical signal for modulation changes the amount of passing incident light. an optical branching modulation light receiving element that can be used as an optical signal; a light emitting element;
an optical center station equipped with a light receiving element;
A network is formed by connecting a plurality of optical remote stations in a loop with optical fibers, and in the optical center station, the optical branching modulation light-receiving element and the light-receiving element are optically disconnected, and when not transmitting, the When transmitting light from a light emitting element without modulation, the light from the light emitting element is modulated and applied to the network, and the optical remote station is equipped with at least an optical splitting modulation light receiving element, A means is provided for receiving an optical signal by the optical splitting modulation light receiving element and determining whether there is no signal, and when transmitting, the determining means confirms that there is no signal, and the optical branching modulation receiving element detects the incident light. An optical network characterized in that information is transmitted and received between arbitrary optical stations and mutual communication is carried out by modulating the signal and starting reception operation after confirming the presence of a signal through the discriminating means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57065885A JPS58182333A (en) | 1982-04-19 | 1982-04-19 | Optical network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57065885A JPS58182333A (en) | 1982-04-19 | 1982-04-19 | Optical network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58182333A JPS58182333A (en) | 1983-10-25 |
| JPS6358496B2 true JPS6358496B2 (en) | 1988-11-16 |
Family
ID=13299871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57065885A Granted JPS58182333A (en) | 1982-04-19 | 1982-04-19 | Optical network |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58182333A (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5339002A (en) * | 1976-09-22 | 1978-04-10 | Takaoka Electric Mfg Co Ltd | Light signal transmitting system |
-
1982
- 1982-04-19 JP JP57065885A patent/JPS58182333A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58182333A (en) | 1983-10-25 |
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