JPS6251531B2 - - Google Patents
Info
- Publication number
- JPS6251531B2 JPS6251531B2 JP55186925A JP18692580A JPS6251531B2 JP S6251531 B2 JPS6251531 B2 JP S6251531B2 JP 55186925 A JP55186925 A JP 55186925A JP 18692580 A JP18692580 A JP 18692580A JP S6251531 B2 JPS6251531 B2 JP S6251531B2
- Authority
- JP
- Japan
- Prior art keywords
- optical
- signal
- transmission line
- data
- bypass path
- 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
- H04B10/29—Repeaters
Landscapes
- Small-Scale Networks (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Description
【発明の詳細な説明】
本発明は光ループ伝送網における光増幅機能を
有する端局装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a terminal device having an optical amplification function in an optical loop transmission network.
以下に光ループ伝送網について説明する。第１
図は光ループ伝送網の概念図である。本図におい
て、１は光伝送路、２は中央局、３は端局であ
る。光ループ伝送網は、光ループの監視、制御を
行なう１つの中央局２と光伝送路１からのデータ
の抽出および挿入を行なう複数の端局３を伝送路
１でループ状に接続したものである。 The optical loop transmission network will be explained below. 1st
The figure is a conceptual diagram of an optical loop transmission network. In this figure, 1 is an optical transmission line, 2 is a central station, and 3 is a terminal station. An optical loop transmission network is a network in which one central station 2 that monitors and controls the optical loop and multiple terminal stations 3 that extract and insert data from the optical transmission line 1 are connected in a loop through a transmission line 1. be.
第２図は上述の光ループ伝送網における光バイ
パス機能をもつた端局３の構成である。本図にお
いて４は光−電気変換回路、５は電気−光変換回
路、６はフレーム同期回路、７は信号処理回路、
８は可変光減衰器、９は光バイパス路、１０，１
０′は一部透過形ミラ、１１は受信データ、１２
は送信データ、１３は送信タイミング信号であ
る。光伝送路１に接続される複数の端局３におい
ては、局内での障害発生時にも通信を維持するた
め光バイパス路９が設けられ、光伝送路１よりの
光信号が一部透過形ミラー１０により光バイパス
路７と光−電気変換回路４に分岐されている。 FIG. 2 shows the configuration of the terminal station 3 having an optical bypass function in the above-mentioned optical loop transmission network. In this figure, 4 is an optical-to-electric conversion circuit, 5 is an electric-to-optical conversion circuit, 6 is a frame synchronization circuit, 7 is a signal processing circuit,
8 is a variable optical attenuator, 9 is an optical bypass path, 10, 1
0' is a partially transparent mirror, 11 is received data, 12
is transmission data, and 13 is a transmission timing signal. In a plurality of terminal stations 3 connected to the optical transmission line 1, an optical bypass line 9 is provided in order to maintain communication even when a failure occurs within the station, and a part of the optical signal from the optical transmission line 1 is passed through a transmission mirror. 10, it is branched into an optical bypass path 7 and an optical-to-electrical conversion circuit 4.
従来、上述のような構成の端局装置において自
局からデータを光伝送路１に送出する場合には、
自局より挿入するデータのみを電気−光変換回路
５で光信号に変換し、その波高を光可変減衰器８
により光バイパス路９を通過してくる主信号の波
高にあわせて、一部透過形ミラー１０′で主信号
に挿入する方式がとられている。以上の動作を第
３図を用いてさらに説明する。第３図は第２図の
Ａ〜Ｄ点における光信号の波高を示す図である。
光伝送路１からの光信号Ａは一部透過形ミラー１
０で分岐され、光信号Ａの一部Ｂが光バイパス路
９に入力される。端局３より挿入するデータＣを
送信タイミング信号Ｂに同期して光バイパス路９
からの主信号Ｂに挿入し、光伝送路１には光信号
Ｄが送出される。 Conventionally, when transmitting data from the own station to the optical transmission line 1 in a terminal device configured as described above,
Only the data inserted from the own station is converted into an optical signal by the electric-optical conversion circuit 5, and the wave height is converted to an optical signal by the variable optical attenuator 8.
According to the wave height of the main signal passing through the optical bypass path 9, a partially transmissive mirror 10' is used to insert the signal into the main signal. The above operation will be further explained using FIG. 3. FIG. 3 is a diagram showing the wave heights of optical signals at points A to D in FIG. 2.
Optical signal A from optical transmission line 1 is partially transmitted through mirror 1
0, and part B of the optical signal A is input to the optical bypass path 9. The data C inserted from the terminal station 3 is sent to the optical bypass path 9 in synchronization with the transmission timing signal B.
The optical signal D is inserted into the main signal B from the main signal B, and the optical signal D is sent to the optical transmission line 1.
以上が従来のデータの挿入方式であるが、第３
図からもわかるように従来は自局から挿入するデ
ータのみを、光バイパス路９を通過してきた光信
号の波高にあわせて挿入していたので、光伝送路
１を伝送される光信号は端局３を通過する毎に減
減し、光伝送路１に接続可能な局数が制限されて
しまう。 The above is the conventional data insertion method, but the third
As can be seen from the figure, conventionally only the data inserted from the own station was inserted in accordance with the wave height of the optical signal passing through the optical bypass path 9, so the optical signal transmitted through the optical transmission path 1 was Each time it passes through the station 3, the number of stations decreases, and the number of stations that can be connected to the optical transmission line 1 is limited.
本発明は上述の欠点を除去し光増幅機能を有す
る端局装置を提供することを目的とし、光ループ
伝送路の光信号を光バイパス路と信号処理部に２
分岐し、該信号処理部において所定の処理後、再
び該バイパス路の信号と合成し該光ループ伝送路
に送出する端局装置において、該信号処理部に分
岐された信号の処理信号レベルが、該バイパス路
の信号レベルと該処理部に分岐された信号のうち
処理を施されない信号のレベルとの和に略等しく
なるようにしたことを特徴とするものである。 An object of the present invention is to eliminate the above-mentioned drawbacks and provide a terminal device having an optical amplification function.
In the end station device which branches the signal and after predetermined processing in the signal processing section, combines it with the signal of the bypass path again and sends it out to the optical loop transmission path, the processed signal level of the signal branched to the signal processing section is The signal level of the bypass path is approximately equal to the sum of the level of the signal that is not processed among the signals branched to the processing section.
以下に図を用いて本発明を詳細に説明する。 The present invention will be explained in detail below using the figures.
第４図は本発明の一実施例である。本図におい
て１４は信号処理回路、１５は可変減衰器、１６
は信号合成器、１７は光バイパス路、１８は挿入
信号、１９は光伝送路１よりの主信号である。な
お本図において第２図と同一番号は同一部位を示
す。第５図は第４図のＥ〜Ｊ点の波高を示す図で
ある。なお本図においてＦ，Ｊは電気信号であ
り、その他は光信号である。 FIG. 4 shows an embodiment of the present invention. In this figure, 14 is a signal processing circuit, 15 is a variable attenuator, and 16 is a signal processing circuit.
1 is a signal combiner, 17 is an optical bypass line, 18 is an insertion signal, and 19 is a main signal from the optical transmission line 1. Note that in this figure, the same numbers as in FIG. 2 indicate the same parts. FIG. 5 is a diagram showing wave heights at points E to J in FIG. 4. In this figure, F and J are electrical signals, and the others are optical signals.
本発明の一実施例は、端局からの送信データ１
２の光伝送路１よりの主信号１９への挿入を電気
信号の領域で行ない、主信号１９と挿入データ１
８を共に電気−光信号変換回路５に入力し光信号
として光バイパス路１７からの信号と合成するこ
とにより光増幅機能をもたせたものである。 In one embodiment of the present invention, transmission data 1 from a terminal station is
The insertion into the main signal 19 from the optical transmission line 1 of 2 is performed in the electrical signal area, and the main signal 19 and the inserted data 1 are
8 are both input to the electrical-to-optical signal conversion circuit 5 and combined with the signal from the optical bypass path 17 as an optical signal, thereby providing an optical amplification function.
すなわち光伝送路１からの主信号１９は可変減
衰器１５で所定の減衰をうけ、送信タイミング信
号１３に同期した挿入データ１８と信号合成器１
６により合成される。両者の合成された信号は電
気−光変換回路５で光信号となり、一部透過形ミ
ラー１０′で光バイパス路１７よりの光信号と合
成される。なおここで主信号１９を減衰させて挿
入データ１８と合成したのは、電気−光変換回路
５からの出力は主信号１９と挿入データ１８が合
成されたものであるのに対し、光バイパス路１７
からの信号は、主信号のみであるのでそのまま両
者を合成すると波高の不一致が生じるためであ
る。したがつて第５図Ｆ，Ｇのように主信号１９
のレベルを下げて、Ｈのように挿入データ１８と
合成することにより、一部透過形ミラー１０′で
光バイパス路からの信号Ｉと合成した出力はＪの
ように波高の一致した出力が得られる。 That is, the main signal 19 from the optical transmission line 1 is attenuated to a predetermined value by the variable attenuator 15, and is then outputted to the insertion data 18 synchronized with the transmission timing signal 13 and the signal combiner 1.
6. The combined signal of both becomes an optical signal in the electro-optical conversion circuit 5, and is combined with the optical signal from the optical bypass path 17 in the partially transmissive mirror 10'. Note that the main signal 19 is attenuated and combined with the insertion data 18 here because the output from the electrical-to-optical conversion circuit 5 is a combination of the main signal 19 and the insertion data 18, whereas the output from the optical bypass path 17
Since the signal from the main signal is only the main signal, if the two are combined as is, a mismatch in wave height will occur. Therefore, the main signal 19 as shown in FIG.
By lowering the level of the signal and combining it with the inserted data 18 as shown in H, the output combined with the signal I from the optical bypass path using the partially transmissive mirror 10' can be output with the same wave height as shown in J. It will be done.
なお本発明の一実施例において使用した光バイ
パス路１７には、信号処理回路１４等における信
号の遅延を補償するため遅延特性をもたせてい
る。 Note that the optical bypass path 17 used in one embodiment of the present invention is provided with delay characteristics to compensate for signal delays in the signal processing circuit 14 and the like.
以上のように本実施例においては主信号１９と
挿入データを共に光信号に変換して出力するため
端局３は光の増幅機能をもつことになる。 As described above, in this embodiment, since both the main signal 19 and the insertion data are converted into optical signals and output, the terminal station 3 has an optical amplification function.
以上説明したように本発明によれば、端局３が
光増幅機能を持つため、多くの端局３を光伝送路
に接続でき、また端局間の間隔も大きくとること
ができるので、ループ長をより長くすることが可
能である。 As explained above, according to the present invention, since the terminal station 3 has an optical amplification function, many terminal stations 3 can be connected to the optical transmission line, and since the intervals between the terminal stations can be large, the loop It is possible to make the length longer.
第１図はループ伝送網の概念図、第２図は従来
の端局の構成、第３図は第２図のＡ〜Ｄ点の波高
を示す図、第４図は本発明の一実施例、第５図は
第４図のＥ〜Ｊ点の波高を示す図である。
１……光伝送路、４……光−電気変換回路、５
……電気−光変換回路、６……フレーム同期回
路、１０，１０′……一部透過形ミラー、１１…
…受信データ、１２……送信データ、１３……送
信タイミング信号、１４……信号処理回路、１５
……可変減衰器、１６……信号合成器、１７……
光バイパス路、１８……挿入データ、１９……主
信号。
Figure 1 is a conceptual diagram of a loop transmission network, Figure 2 is the configuration of a conventional terminal station, Figure 3 is a diagram showing wave heights at points A to D in Figure 2, and Figure 4 is an embodiment of the present invention. , FIG. 5 is a diagram showing wave heights at points E to J in FIG. 4. 1... Optical transmission line, 4... Optical-electrical conversion circuit, 5
...Electric-optical conversion circuit, 6...Frame synchronization circuit, 10, 10'...Partially transparent mirror, 11...
... Reception data, 12 ... Transmission data, 13 ... Transmission timing signal, 14 ... Signal processing circuit, 15
...Variable attenuator, 16...Signal combiner, 17...
Optical bypass path, 18... insertion data, 19... main signal.
Claims (1)
号処理部に２分岐し、該信号処理部において所定
の処理後、再び該バイパス路の信号と合成し該光
ループ伝送路に送出する端局装置において、該信
号処理部に分岐された信号の処理信号レベルが、
該バイパス路の信号レベルと該処理部に分岐され
た信号のうち処理を施されない信号のレベルとの
和に略等しくなるようにしたことを特徴とする光
増幅機能を有する端局装置。1 A terminal station that branches the optical signal on the optical loop transmission line into an optical bypass line and a signal processing unit, and after predetermined processing in the signal processing unit, combines it with the signal on the bypass line again and sends it out to the optical loop transmission line. In the device, the processed signal level of the signal branched to the signal processing section is
A terminal device having an optical amplification function, characterized in that the signal level of the bypass path is approximately equal to the sum of the level of a signal that is not processed among the signals branched to the processing section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55186925A JPS57111145A (en) | 1980-12-26 | 1980-12-26 | Terminal station equipment having optical amplifying function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55186925A JPS57111145A (en) | 1980-12-26 | 1980-12-26 | Terminal station equipment having optical amplifying function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57111145A JPS57111145A (en) | 1982-07-10 |
| JPS6251531B2 true JPS6251531B2 (en) | 1987-10-30 |
Family
ID=16197101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55186925A Granted JPS57111145A (en) | 1980-12-26 | 1980-12-26 | Terminal station equipment having optical amplifying function |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57111145A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60160231A (en) * | 1984-01-31 | 1985-08-21 | Toshiba Corp | Loop form optical dataway system |
-
1980
- 1980-12-26 JP JP55186925A patent/JPS57111145A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57111145A (en) | 1982-07-10 |
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