JPS628979B2 - - Google Patents
Info
- Publication number
- JPS628979B2 JPS628979B2 JP56152895A JP15289581A JPS628979B2 JP S628979 B2 JPS628979 B2 JP S628979B2 JP 56152895 A JP56152895 A JP 56152895A JP 15289581 A JP15289581 A JP 15289581A JP S628979 B2 JPS628979 B2 JP S628979B2
- Authority
- JP
- Japan
- Prior art keywords
- optical
- input
- optical switch
- output
- electrical
- 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
- 230000003287 optical effect Effects 0.000 claims description 77
- 230000005540 biological transmission Effects 0.000 claims description 64
- 238000000034 method Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- 239000013307 optical fiber Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3084—Automatic control in amplifiers having semiconductor devices in receivers or transmitters for electromagnetic waves other than radiowaves, e.g. lightwaves
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Optical Communication System (AREA)
- Control Of Amplification And Gain Control (AREA)
Description
【発明の詳細な説明】
本発明は光通信システムにおける光スイツチシ
ステムの自動利得調整方式に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic gain adjustment method for an optical switch system in an optical communication system.
光通信システムにおいて、情報源から得られた
情報は、概略的に次の径路で伝送される場合が多
い。すなわち、情報の電気信号が電気−光変換部
（以下、単にＥ／Ｏと称する）で光信号に変換さ
れ、次いで光入力伝送路（光フアイバケーブ
ル）、光スイツチシステム及び光出力伝送路（光
フアイバケーブル）を経由して光−電気変換部
（以下、単にＯ／Ｅと称する）で再び電気信号に
変換されて復調器等に伝送される。前記光スイツ
チシステムは入力側と出力側の伝送路をそれぞれ
複数個、例えばｎ個とｍ個の伝送路を有する場合
が多く、これらを互いに切換えてｎ×ｍ組の入出
力伝送路の組合せが可能である。この場合送信側
の上記Ｅ／Ｏから受信側の上記光スイツチ間まで
の各入力伝送路の距離、すなわち長さはそれぞれ
異なつているのが通常である。伝送される光パワ
ーは伝送路の長さに比例して損失が増加するの
で、上記ｎ個の入力伝送路における光損失はその
長さに応じて大小の差が生ずることになる。従つ
て、上記ｎ個の入力伝送路から光スイツチシステ
ムに入力される光パワーのレベルはそれぞれ異な
つたものになる。また、光スイツチにおいても接
続損失等により伝送光パワーの損失が生ずる。さ
らに光スイツチからＯ／Ｅまでの出力伝送路にお
いても伝送光パワーの損失が生ずる。従つて、入
出力伝送路の各組合せごとに光損失のレベル差が
生ずることになるので、Ｏ／Ｅに入力する光パワ
ーのレベルは入出力伝送路の組合せによつて大き
く変わつてしまう。一方、上記Ｏ／Ｅはこれらの
光信号を変換して出力すべき電気信号のレベルを
所定の一定値に保つて復調等に送出する必要があ
る。また、光損失の1dBは電気の場合では2dBに
相当するので、Ｏ／Ｅ入力光パワーはその大小差
によつてＯ／Ｅの出力電気レベルに大きな影響を
与えることになる。そこで、このＯ／Ｅの出力電
気レベルを一定に保つためには、Ｏ／Ｅ入力パワ
ーの広範囲にわたる利得調整が必要である。 In optical communication systems, information obtained from an information source is often transmitted roughly along the following path. That is, an electrical signal of information is converted into an optical signal by an electrical-to-optical converter (hereinafter simply referred to as E/O), and then connected to an optical input transmission line (optical fiber cable), an optical switch system, and an optical output transmission line (optical fiber cable). The optical signal is converted back into an electrical signal by an optical-to-electrical converter (hereinafter simply referred to as O/E) via a fiber cable) and transmitted to a demodulator or the like. The optical switch system often has a plurality of transmission lines on the input side and output side, for example, n and m transmission lines, and these are mutually switched to create n×m combinations of input and output transmission lines. It is possible. In this case, the distances, ie, lengths, of each input transmission path from the E/O on the transmitting side to the optical switches on the receiving side are usually different. Since the loss of transmitted optical power increases in proportion to the length of the transmission path, the optical loss in the n input transmission paths differs in magnitude depending on the length. Therefore, the levels of optical power input to the optical switch system from the n input transmission lines are different from each other. Furthermore, in optical switches, loss of transmission optical power occurs due to connection loss and the like. Furthermore, loss of transmission optical power also occurs in the output transmission path from the optical switch to the O/E. Therefore, since a difference in the level of optical loss occurs for each combination of input/output transmission lines, the level of optical power input to the O/E varies greatly depending on the combination of input/output transmission lines. On the other hand, the O/E needs to convert these optical signals and keep the level of the electrical signal to be output at a predetermined constant value before sending it out for demodulation or the like. Furthermore, since 1 dB of optical loss corresponds to 2 dB in the case of electricity, the difference in the magnitude of the O/E input optical power has a great effect on the output electrical level of the O/E. Therefore, in order to keep the output electrical level of this O/E constant, it is necessary to adjust the gain of the O/E input power over a wide range.
〓〓〓〓
従来のこの種の光スイツチシステムでは、光ス
イツチが単に入力と出力伝送路の切換えを行うの
みで、Ｏ／Ｅに自動利得制御素子（以下単に
AGC素子と呼ぶ）、例えば電界効果トランジスタ
（FET）やアバランシホトダイオード（APD）な
どを設けＯ／Ｅ自体に自動利得調整機能が付加さ
れている。しかしながら、一般にこのように
AGC素子のみでは利得調整範囲をあまり広範囲
にわたつてカバーできないので、従来の光スイツ
チシステムでは、例えば光損失で10dB、すなわ
ち電気レベルで20dBという大きな範囲の調整は
非常に困難である。また、この従来の光スイツチ
システムは、入出力伝送路の組合せによつて差が
生ずるＯ／Ｅ入力光パワーを各組合せの入出力伝
送路に応じて自動利得調整することができないの
で、Ｏ／Ｅ出力電気レベルを良好に一定に保つこ
とができない。この対策として、光スイツチの各
入力コネクタと入力伝送路の間に光アツテネータ
（光ATT）を介在装置して、Ｏ／Ｅ入力光パワー
を同程度に調整することが考えられる。しかしな
がら、この場合は、光アツテネータは非常に高価
であつて経済性に問題があること、また各Ｅ／Ｏ
からの信号と雑音との強さの比、すなわちＳ／Ｎ
比を、一律に最もＳ／Ｎ比の悪い伝送路のＳ／Ｎ
比に合せてしまうこと、等の好ましくない問題が
あり根本的な解決とはならない。〓〓〓〓
In conventional optical switch systems of this type, the optical switch simply switches input and output transmission paths, and an automatic gain control element (hereinafter simply referred to as
The O/E itself has an automatic gain adjustment function. However, generally like this
Since the AGC element alone cannot cover a very wide gain adjustment range, it is extremely difficult for conventional optical switch systems to adjust over a large range of, for example, 10 dB in optical loss, or 20 dB in electrical level. In addition, this conventional optical switch system cannot automatically adjust the gain of the O/E input optical power, which varies depending on the combination of input and output transmission lines, depending on the combination of input and output transmission lines. It is not possible to keep the E output electrical level well constant. As a countermeasure to this problem, it is possible to adjust the O/E input optical power to the same level by interposing an optical attenuator (optical ATT) between each input connector of the optical switch and the input transmission line. However, in this case, the optical attenuator is very expensive and there is a problem with economic efficiency, and each E/O
The ratio of the strength of the signal to the noise, i.e. S/N
The ratio is uniformly the S/N of the transmission line with the worst S/N ratio.
There are undesirable problems such as adjusting to the ratio, and it is not a fundamental solution.
本発明の目的は上記のような従来技術の欠点を
解決しＯ／Ｅの電気出力レベルが一定となるよう
な安価な光スイツチシステムの自動利得調整方式
を提供することにある。 SUMMARY OF THE INVENTION An object of the present invention is to provide an inexpensive automatic gain adjustment method for an optical switch system that solves the above-mentioned drawbacks of the prior art and keeps the electrical output level of the O/E constant.
この目的を達成するために、本発明に依れば入
力伝送路ｎ個対伝送路ｍ個の光スイツチシステム
において、上記入力伝送路と出力伝送路の切換え
組合せ情報を、上記光スイツチシステムにおける
光スイツチと、上記出力伝送路側に設けた光−電
気変換部とに同時に送出することにより、上記光
スイツチにおける入出力伝送路のいづれの組合せ
においても上記光−電気変換部の電気出力レベル
が一定となるように、上記各組合せの入出力伝送
路それぞれに対応した利得調整を上記光−電気変
換部で行うことを特徴とする光スイツチシステム
の自動利得調整方式が提供される。 In order to achieve this object, according to the present invention, in an optical switch system having n input transmission lines and m transmission lines, switching combination information of the input transmission line and output transmission line is transmitted to the optical switch system in the optical switch system. By simultaneously sending signals to the switch and the optical-to-electrical converter provided on the output transmission path side, the electrical output level of the optical-to-electrical converter is constant for any combination of input and output transmission paths in the optical switch. Thus, there is provided an automatic gain adjustment method for an optical switch system, characterized in that the optical-to-electrical conversion section performs gain adjustment corresponding to each of the input/output transmission lines of each combination.
以下、本発明の実施例を添付図面にもとづき詳
細に説明する。 Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
第１図は本発明による方式の適用例を示す図
で、光通信システムにおける光スイツチシステム
の入力と出力伝送路が４個対１個の場合の適用例
である。同図に示す光通信システムは、例えば道
路監視、河川監視などに使用できるもので各テレ
ビカメラの監視情報を受信センターで選択してモ
ニターテレビに映し出すものである。図におい
て、１ａ，１ｂ，１ｃ及び１ｄはテレビカメラ、
３ａ，３ｂ，３ｃ及び３ｄは電気信号線、５ａ，
５ｂ，５ｃ及び５ｄはそれぞれ電気−光変換部
Ｅ／O1、Ｅ／O2、Ｅ／O3及びＥ／O4、７ａ，
７ｂ，７ｃ及び７ｄは光信号入力伝送路（光フア
イバケーブル）９は受信センタ、１１は光スイツ
チ、１３は光信号出力伝送路、１５は受光素子、
１７はＯ／Ｅ、１９は電気信号線、２１はモニタ
ーテレビ、２３はキーボード、２４は電気信号
線、２５は光スイツチ及びＯ／Ｅ制御装置、そし
て２７，２８は電気信号線を示す。カメラ１ａは
とらえた情報を電気信号として電気信号線３ａを
介して５ａのＥ／O1に送出する。Ｅ／O1はこの
電気信号を光信号に変換し、光信号入力伝送路７
ａを介して受信センタ９の光スイツチ１１に送出
する。光スイツチ１１は公知のもので切換え動作
によつて入力伝送路７ａを出力伝送路１３に接続
し、該伝送路１３及び受光素子１５を介して光信
号をＯ／Ｅ、１７に導く。Ｏ／Ｅ、１７はこの光
信号を再び電気信号に変換してテレビ２１に送出
し、該テレビ２１はこの電気信号にもとづいて上
記情報を映し出す。尚、上記以外のカメラ１ｂ，
１ｃ及び１ｄからテレビ２１までの情報伝達は上
記説明と全く同様にして行われる。キーボード２
３は入力伝送路７ａ，７ｂ，７ｃ及び７ｄと出力
伝送路１３の組合せの命令信号を送出するもの
で、予め定められた各組合せ設定のキーが押圧さ
れると、電気信号線２４を介して命令信号を制御
装置２５に送出する。制御装置２５はこの命令信
号にもとづき入出力伝送路の組合せ信号、例えば
Ｅ／O1とＯ／Ｅの組合せ信号を電気信号線２７
を介して光スイツチ１１に送出し、同時に電気信
号線２８を介してこの入出力伝送路の組合せ信号
を１７のＯ／Ｅにも送出する。この組合せ信号に
もとづき、光スイツチ１１は信号に応じた組合
せ、例えばＥ／O1→Ｏ／Ｅの組合せに入出力伝
送路を切換え、一方Ｏ／Ｅは、上記組合せの伝送
〓〓〓〓
路Ｅ／O1→Ｏ／Ｅを介して入力した光パワーを
電気信号に変換し、この電気信号を予めその利得
調整量を設定してＯ／Ｅ内部に設けられたＥ／
O1→Ｏ／Ｅ用の回路によつて、自動利得調整し
て一定の電気出力レベルとして電気信号線１９に
送出する。 FIG. 1 is a diagram showing an example of application of the method according to the present invention, in which the number of input and output transmission lines of an optical switch system in an optical communication system is 4 to 1. The optical communication system shown in the figure can be used, for example, for road monitoring, river monitoring, etc., and monitor information from each television camera is selected at a reception center and displayed on a monitor television. In the figure, 1a, 1b, 1c and 1d are television cameras,
3a, 3b, 3c and 3d are electric signal lines, 5a,
5b, 5c and 5d are electrical-optical converters E/O1, E/O2, E/O3 and E/O4, 7a,
7b, 7c and 7d are optical signal input transmission lines (optical fiber cables); 9 is a reception center; 11 is an optical switch; 13 is an optical signal output transmission line; 15 is a light receiving element;
17 is an O/E, 19 is an electric signal line, 21 is a monitor television, 23 is a keyboard, 24 is an electric signal line, 25 is an optical switch and an O/E control device, and 27 and 28 are electric signal lines. The camera 1a sends the captured information as an electrical signal to the E/O1 of 5a via the electrical signal line 3a. E/O1 converts this electrical signal into an optical signal and connects it to the optical signal input transmission line 7.
The signal is sent to the optical switch 11 of the receiving center 9 via a. The optical switch 11 is a well-known device that connects the input transmission line 7a to the output transmission line 13 by a switching operation, and guides the optical signal to the O/E 17 via the transmission line 13 and the light receiving element 15. The O/E 17 converts this optical signal into an electrical signal again and sends it to the television 21, and the television 21 displays the above information based on this electrical signal. In addition, cameras other than the above 1b,
Information transmission from 1c and 1d to the television 21 is performed in exactly the same manner as described above. keyboard 2
Reference numeral 3 sends command signals for combinations of the input transmission lines 7a, 7b, 7c, and 7d and the output transmission line 13, and when a key for each predetermined combination setting is pressed, a command signal is sent via the electric signal line 24. A command signal is sent to the control device 25. Based on this command signal, the control device 25 sends a combination signal of input/output transmission paths, for example, a combination signal of E/O1 and O/E to the electric signal line 27.
At the same time, the combined signal of this input/output transmission line is sent to the O/E 17 via the electric signal line 28. Based on this combination signal, the optical switch 11 switches the input/output transmission path to a combination according to the signal, for example, E/O1 → O/E, while O/E switches the transmission of the above combination.
The optical power input via the path E/O1 → O/E is converted into an electrical signal, and this electrical signal is sent to the E/E installed inside the O/E with the gain adjustment amount set in advance.
The O1→O/E circuit automatically adjusts the gain and sends it to the electrical signal line 19 as a constant electrical output level.
第２図は第１図のＯ／Ｅにおける回路の一例の
ブロツク図である。図において、２９はプリアン
プ、２９ａは帰還抵抗、３０は出力アンプ、そし
て次は本発明に係るもので、３１，３２はリレ
ー、３３ａは減衰器Ａ、３３ｂは減衰器Ｂ、３３
ｃは電気信号線、３３ｄは増幅器を示す。尚、図
中の上記以外の符号は第１図に示す符号と同一部
分を示す。リレー３１と３２間に、減衰器Ａ、３
３ａ、減衰器Ｂ、３３ｂ、電気信号線３３ｃ及び
増幅器３３ｄをそれぞれ経由する４つの径路が設
けられている。これらの経路は第１図における４
通りの組合せ入出力伝送路にそれぞれ対応するも
ので、例えば第１図のＥ／O1→Ｏ／Ｅの組合せ
の伝送路に対しては減衰器Ａ、３３ａの径路が対
応している。この場合、減衰器Ａ、３３ａは、
Ｅ／01→Ｏ／Ｅの組合せ伝送路における光パワー
の損失を予め算出しこれに見合つた利得調整を行
うように設定されているもので、Ｅ／O1→Ｏ／
Ｅの組合せ伝送路用の利得調整径路としての役割
を果すものである。このようにしてＯ／Ｅ入力光
パワーの損失に見合つた利得調整を行うことによ
り、Ｏ／Ｅの電気出力レベルをきわめて良好に一
定に保つことができる。次に、第２図における作
動を説明する。制御装置２５はキーボード２３か
ら入出力伝送路の組合せの命令信号を受けると、
これに対応して予め記憶してある入出力伝送路の
組合せ信号、例えばＥ／O1→Ｏ／Ｅの組合せ信
号を、信号線２７を介して光スイツチ１１に送出
し、同時に信号線２８を介してリレー３１と３２
にも送出する。従つて、リレー３１と３２は光ス
イツチ１１の切換え動作と連動して上記Ｅ／O1
→Ｏ／Ｅ伝送路に対応する減衰器Ａ、３３ａの径
路を接続する。そして、Ｅ／O1→Ｏ／Ｅの組合
せの伝送路を経由したＯ／Ｅ入力光パワーは受光
素子１５、プリアンプ２９等を介して電気信号に
変換され増幅されてリレー３１に導びかれる。リ
レー３１と３２はすでに上記の如く減衰器Ａ、３
３ａの径路を接続しているので、上記電気信号は
この径路で自動利得調整され、増幅器３０を経由
して信号線１９に導かれる。他の入出力送路の組
合せにおいても上記と同様にその組合せに対応し
た自動利得調整が行われる。 FIG. 2 is a block diagram of an example of the circuit in the O/E of FIG. In the figure, 29 is a preamplifier, 29a is a feedback resistor, 30 is an output amplifier, and the following are related to the present invention, 31 and 32 are relays, 33a is attenuator A, 33b is attenuator B, 33
c indicates an electric signal line, and 33d indicates an amplifier. Note that the symbols other than those mentioned above in the drawings indicate the same parts as those shown in FIG. Attenuators A and 3 are installed between relays 31 and 32.
3a, attenuator B, 33b, electric signal line 33c, and amplifier 33d. These routes are 4 in Figure 1.
For example, the path of the attenuator A, 33a corresponds to the transmission path combination of E/O1→O/E in FIG. In this case, the attenuator A, 33a is
It is set to calculate the optical power loss in the combined transmission line of E/01→O/E in advance and adjust the gain accordingly.
This serves as a gain adjustment path for the E combination transmission path. By adjusting the gain to compensate for the loss of the O/E input optical power in this manner, the electrical output level of the O/E can be kept very well constant. Next, the operation in FIG. 2 will be explained. When the control device 25 receives a command signal for a combination of input and output transmission paths from the keyboard 23,
Correspondingly, a combination signal of the input/output transmission paths stored in advance, for example, a combination signal of E/O1 → O/E, is sent to the optical switch 11 via the signal line 27, and at the same time, is sent to the optical switch 11 via the signal line 28. relays 31 and 32
It will also be sent to Therefore, the relays 31 and 32 operate in conjunction with the switching operation of the optical switch 11 to switch the E/O1.
→ Connect the path of attenuator A and 33a corresponding to the O/E transmission path. The O/E input optical power passing through the transmission line of the combination E/O1→O/E is converted into an electrical signal via the light receiving element 15, preamplifier 29, etc., amplified, and guided to the relay 31. Relays 31 and 32 are already connected to attenuators A and 3 as described above.
Since the path 3a is connected, the electrical signal is automatically gain-adjusted on this path and guided to the signal line 19 via the amplifier 30. For other combinations of input/output paths, automatic gain adjustment corresponding to the combination is performed in the same manner as above.
第３図は入力と出力伝送路が３個対３個の光ス
イツチシステムへの本発明の第２適用例を示すも
のである。図において、１３ａ，１３ｂ，１３ｃ
は出力伝送路、１５ａ，１５ｂ，１５ｃは受光素
子、１７ａ，１７ｂ，１７ｃはそれぞれＯ／
E1、Ｏ／E2、Ｏ／E3、２８ａ，２８ｂ，２８ｃ
は電気信号線を示し、前記以外の符号は第１図に
示す符号と同一部分を示す。この場合は、入出力
伝送路の組合せが９組（３×３）に増加されたの
みで、基本的構成及び動作は前出の第１図と第２
図に示した第１適用例と全く同様である。 FIG. 3 shows a second example of application of the present invention to an optical switch system having three input and three output transmission lines. In the figure, 13a, 13b, 13c
is an output transmission line, 15a, 15b, 15c are light receiving elements, and 17a, 17b, 17c are respective O/
E1, O/E2, O/E3, 28a, 28b, 28c
1 indicates an electric signal line, and symbols other than those mentioned above indicate the same parts as those shown in FIG. In this case, the combinations of input and output transmission lines have only been increased to nine (3 x 3), and the basic configuration and operation are as shown in Figures 1 and 2 above.
This is exactly the same as the first application example shown in the figure.
このように本発明に依れば、入出力伝送路の組
合せ信号を光スイツチとＯ／Ｅとに同時に送出す
る方式によつて、光スイツチの入出力伝送路の切
換えと同時に、この切換えた伝送路に対応して
Ｏ／Ｅに予め設定した利得調整径路も切換えて
Ｏ／Ｅ入力光パワーの自動利得調整を行うことが
可能である。このため従来のように広範囲にわた
る高価なAGC素子の用意の必要がなく従つて安
価でしかもＯ／Ｅ入力光パワーの広範な損失差に
わたつて良好な利得調整が可能な光スイツチシス
テムの自動利得調整方式を実現することができ
る。 As described above, according to the present invention, by the method of simultaneously sending out the combined signal of the input and output transmission lines to the optical switch and the O/E, the switched transmission can be performed at the same time as the input and output transmission lines of the optical switch are switched. It is also possible to perform automatic gain adjustment of the O/E input optical power by switching the gain adjustment path preset in the O/E corresponding to the path. Therefore, there is no need to prepare expensive AGC elements over a wide range as in the past, and the automatic gain of the optical switch system is inexpensive and allows good gain adjustment over a wide range of loss differences in O/E input optical power. An adjustment method can be realized.
第１図は本発明の第１適用例であつて、入力と
出力伝送路が４個対１個の光スイツチシステムへ
の適用例を示す図、第２図は第１図のＯ／Ｅ内部
の回路のブロツク図、第３図は本発明の第２適用
例であつて、入力と出力伝送路が３個対３個の光
スイツチシステムへの適用例を示す図である。
５ａ，５ｂ，５ｃ，５ｄ……電気−光変換部
（Ｅ／O1、Ｅ／O2、Ｅ／O3、Ｅ／O4）、７ａ，
７ｂ，７ｃ，７ｄ……入力伝送路、１１……光ス
イツチ、１３，１３ａ，１３ｂ，１３ｃ……出力
伝送路、１５，１５ａ，１５ｂ，１５ｃ……受光
素子、１７，１７ａ，１７ｂ，１７ｃ……光−電
気変換部（Ｏ／Ｅ、Ｏ／E1、Ｏ／E2、Ｏ／
E3）、１９，２４，２７，２８……電気信号線、
２３……キーボード、２５……光スイツチ及び
Ｏ／Ｅ制御装置、２９……プリアンプ、３０……
〓〓〓〓
出力アンプ、３１，３２……リレー、３３ａ……
減衰器Ａ、３３ｂ……減衰器Ｂ、３３ｃ……電気
信号線、３３ｄ……増幅器。
〓〓〓〓
FIG. 1 is a first application example of the present invention, which shows an example of application to an optical switch system with four input and output transmission lines, and FIG. 2 shows the inside of the O/E shown in FIG. 1. FIG. 3 is a second application example of the present invention, and is a diagram showing an example of application to an optical switch system having three input and three output transmission lines. 5a, 5b, 5c, 5d...Electric-optical converter (E/O1, E/O2, E/O3, E/O4), 7a,
7b, 7c, 7d... Input transmission line, 11... Optical switch, 13, 13a, 13b, 13c... Output transmission line, 15, 15a, 15b, 15c... Light receiving element, 17, 17a, 17b, 17c... …Optical-electrical converter (O/E, O/E1, O/E2, O/
E3), 19, 24, 27, 28...electric signal line,
23...Keyboard, 25...Optical switch and O/E control device, 29...Preamplifier, 30...
〓〓〓〓
Output amplifier, 31, 32...Relay, 33a...
Attenuator A, 33b...attenuator B, 33c...electric signal line, 33d...amplifier. 〓〓〓〓
Claims (1)
チシステムにおいて、上記入力伝送路と出力伝送
路の切換え組合せ情報を、上記光スイツチシステ
ムにおける光スイツチと、上記出力伝送路側に設
けた光−電気変換部とに同時に送出することによ
り、上記光スイツチにおける入出力伝送路のいづ
れの組合せにおいても上記光−電気変換部の電気
出力レベルが一定となるように、上記各組合せの
入出力伝送路それぞれに対応した利得調整を上記
光−電気変換部で行うことを特徴とする光スイツ
チシステムの自動利得調整方式。1. In an optical switch system having n input transmission lines and m output transmission lines, switching combination information of the input transmission line and output transmission line is transmitted between the optical switch in the optical switch system and the optical switch provided on the output transmission line side. By simultaneously transmitting signals to the electrical converter, the input/output transmission paths of each combination of the above-mentioned optical-to-electrical converter are made constant so that the electrical output level of the optical-to-electrical converter is constant in any combination of input/output transmission paths in the optical switch. An automatic gain adjustment method for an optical switch system, characterized in that gain adjustment corresponding to each is performed in the optical-to-electrical conversion section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56152895A JPS5854745A (en) | 1981-09-29 | 1981-09-29 | Automatic gain adjusting system for optical switch system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56152895A JPS5854745A (en) | 1981-09-29 | 1981-09-29 | Automatic gain adjusting system for optical switch system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5854745A JPS5854745A (en) | 1983-03-31 |
| JPS628979B2 true JPS628979B2 (en) | 1987-02-25 |
Family
ID=15550470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56152895A Granted JPS5854745A (en) | 1981-09-29 | 1981-09-29 | Automatic gain adjusting system for optical switch system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5854745A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS649171U (en) * | 1987-07-06 | 1989-01-18 |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6344546U (en) * | 1986-09-08 | 1988-03-25 | ||
| JPS6344547U (en) * | 1986-09-08 | 1988-03-25 | ||
| DE69001772T2 (en) * | 1989-03-31 | 1993-09-09 | Toshiba Kawasaki Kk | FREQUENCY AND VOLTAGE VARIABLE POWER CONVERTER. |
-
1981
- 1981-09-29 JP JP56152895A patent/JPS5854745A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS649171U (en) * | 1987-07-06 | 1989-01-18 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5854745A (en) | 1983-03-31 |
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