JPH10126340A - Transmission line changeover method and system therefor - Google Patents
Transmission line changeover method and system thereforInfo
- Publication number
- JPH10126340A JPH10126340A JP27367196A JP27367196A JPH10126340A JP H10126340 A JPH10126340 A JP H10126340A JP 27367196 A JP27367196 A JP 27367196A JP 27367196 A JP27367196 A JP 27367196A JP H10126340 A JPH10126340 A JP H10126340A
- Authority
- JP
- Japan
- Prior art keywords
- optical
- output
- pattern
- optical fiber
- fiber amplifier
- 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.)
- Pending
Links
Landscapes
- Optical Communication System (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、光伝送路の障害検
出に関し、特に外付けの光ファイバアンプの障害による
誤り光コネクタ外れの検出と受信側端局装置での強制的
な伝送システムの冗長切替に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the detection of a fault in an optical transmission line, and more particularly to the detection of a faulty optical connector disconnection due to a fault in an external optical fiber amplifier and the forcible transmission system redundancy in the receiving terminal equipment. Regarding switching.
【０００２】[0002]
【従来の技術】従来の高出力の光伝送路の光コネクタ外
れの状態監視は、図２に示すように、送信側の端局装置
には、同期パタン発生回路２と、同期パタン挿入回路３
と、電気／光変換回路４とを有し、外付け光ファイバア
ンプには、光を増幅する光ファイバアンプ５と、反射光
を監視する反射モニタ６と、反射モニタ６の結果によっ
て光ファイバアンプ５の出力を自動的に低下させるフィ
ードバック制御回路７とを有し、伝送路には、複数の伝
送路接続点８を有し、受信側の端局装置には、光／電気
変換回路９、フレーム同期回路１０とを有している。2. Description of the Related Art As shown in FIG. 2, a conventional terminal device on the transmitting side includes a synchronous pattern generating circuit 2 and a synchronous pattern inserting circuit 3 for monitoring the state of a detached optical connector of a high-output optical transmission line.
And an electrical / optical conversion circuit 4. The external optical fiber amplifier includes an optical fiber amplifier 5 for amplifying light, a reflection monitor 6 for monitoring reflected light, and an optical fiber amplifier based on the result of the reflection monitor 6. 5, a feedback control circuit 7 for automatically lowering the output of the transmission line 5. The transmission line has a plurality of transmission line connection points 8, and the terminal device on the receiving side has an optical / electrical conversion circuit 9, And a frame synchronization circuit 10.
【０００３】次に動作について説明する。送信側に配置
した外付け光ファイバアンプの反射モニタ６にて反射光
を常時監視させ、伝送路上の伝送路接続点８にて光コネ
クタ外れが発生し、光コネクタの端面が空気に触れて反
射モニタ６に反射光が増大したことを検出し、この検出
結果よりフィードバック制御回路７が動作して、光ファ
イバアンプ５に光出力低下制御を行う。しかし、光コネ
クタ外れ検出後、送信側の反射モニタ６によって光コネ
クタ外れの回復が検出されるように、光出力低下制御時
にもある程度の光出力を行っている。光コネクタ外れが
回復し、反射モニタ６にて反射光が低減したことを検出
すると、フィードバック制御回路７が再び動作し、光フ
ァイバアンプ５の光出力を正常状態に復旧させるように
なっている。Next, the operation will be described. The reflected light is constantly monitored by the reflection monitor 6 of the external optical fiber amplifier disposed on the transmission side, and the optical connector is disconnected at the transmission line connection point 8 on the transmission line, and the end face of the optical connector comes into contact with air and is reflected. The monitor 6 detects that the reflected light has increased, and the feedback control circuit 7 operates based on the result of the detection to control the optical fiber amplifier 5 to reduce the optical output. However, after the disconnection of the optical connector is detected, a certain amount of optical output is performed even during the optical output reduction control so that the reflection monitor 6 on the transmission side detects the recovery of the disconnection of the optical connector. When the disconnection of the optical connector is recovered and the reflection monitor 6 detects that the reflected light is reduced, the feedback control circuit 7 operates again to restore the optical output of the optical fiber amplifier 5 to a normal state.
【０００４】受信側では、伝送路を通ってきた光信号を
光／電気変換回路９を介して電気レベルに変換後、フレ
ーム同期回路１０にて同期処理を行っている。[0004] On the receiving side, the optical signal that has passed through the transmission path is converted into an electric level via the optical / electrical conversion circuit 9 and then subjected to synchronization processing by the frame synchronization circuit 10.
【０００５】[0005]
【発明が解決しようとする課題】しかし、送信側に配置
した外付け光ファイバアンプの反射モニタにより反射光
を常時監視させる従来の伝送路監視システムでは、送信
側の外付け光ファイバアンプにて光コネクタ外れを誤っ
て認識してしまうと、送信する光出力を低下させるだけ
で、伝送路の冗長切替要因とはなっておらず、対向して
いる光受信回路では、入ってくる光の入力レベルによっ
て頻度の少ないエラーを継続的に発生してしまう（伝送
品質の悪いままで継続する）可能性があった。However, in a conventional transmission line monitoring system in which the reflected light is constantly monitored by a reflection monitor of an external optical fiber amplifier disposed on the transmission side, the optical transmission is controlled by an external optical fiber amplifier on the transmission side. If the connector is mistakenly recognized, it only reduces the optical output to be transmitted and does not cause redundant switching of the transmission line. Therefore, there is a possibility that an infrequent error is continuously generated (the transmission is continued with poor transmission quality).
【０００６】本発明の目的は、端局−端局間の伝送路に
外付けの光ファイバアンプを配置した伝送路システムに
おいて、光ファイバアンプの障害によって、誤って光コ
ネクタ外れを検出してしまった場合に、受信側の端局装
置で強制的に受信断を認識し、伝送システムの冗長切替
を起こさせ、不安定な伝送品質のまま継続することを防
止する伝送路切替方法とその方式を提供することであ
る。SUMMARY OF THE INVENTION An object of the present invention is to provide a transmission line system in which an external optical fiber amplifier is arranged in a transmission path between terminal stations, and that a disconnection of an optical connector is erroneously detected due to a failure of the optical fiber amplifier. In this case, the receiving end terminal device forcibly recognizes the disconnection, causes redundant switching of the transmission system, and prevents the transmission path from continuing with unstable transmission quality. To provide.
【０００７】[0007]
【課題を解決するための手段】本発明の伝送路切替方法
は、高出力の光信号を取り扱う際に、送信側で光ファイ
バからの反射光をモニタし、光コネクタ外れの発生を検
出した時には自動的に光出力を弱め、または光コネクタ
外れの回復を検出した時には自動的に光出力を強めて光
信号を復旧させる外付けの光ファイバアンプを配置した
伝送路切替方法において、送信側の端局装置内に、主信
号の同期パタン以外の特定パタンを生成し、所定の同期
パタン位置に前記特定パタンを挿入する固定パタン発生
手順と、前記固定パタン発生手順の特定パタン出力と同
期パタン出力との何れを主信号の同期パタン位置に挿入
するかを、前記外付け光ファイバアンプの光コネクタの
接続状態を監視している反射モニタからの信号により選
択する選択手順を有することを特徴とする。SUMMARY OF THE INVENTION A transmission line switching method according to the present invention monitors a reflected light from an optical fiber on the transmission side when handling a high-output optical signal and detects the occurrence of disconnection of an optical connector. In the transmission line switching method in which an external optical fiber amplifier is arranged to automatically weaken the optical output or to recover the optical signal by detecting the recovery of the disconnection of the optical connector, the optical output is automatically enhanced to recover the optical signal. In the station device, a specific pattern other than the synchronization pattern of the main signal is generated, a fixed pattern generation procedure of inserting the specific pattern at a predetermined synchronization pattern position, a specific pattern output and a synchronization pattern output of the fixed pattern generation procedure Is selected from the reflection monitor that monitors the connection status of the optical connector of the external optical fiber amplifier to determine which of them is inserted into the synchronization pattern position of the main signal. Characterized in that it.
【０００８】また、本発明の伝送路切替方式は、高出力
の光信号を取り扱う際に、送信側で光ファイバからの反
射光をモニタし、光コネクタ外れの発生を検出した時に
は自動的に光出力を弱め、または光コネクタ外れの回復
を検出した時には自動的に光出力を強めて光信号を復旧
させる外付けの光ファイバアンプを配置した伝送路切替
方式において、送信側の端局装置内に、主信号の同期パ
タン以外の特定パタンを生成し、所定の同期パタン位置
に前記特定パタンを挿入する固定パタン発生手段と、
前記固定パタン発生手段の特定パタン出力と同期パタン
出力との何れを主信号の同期パタン位置に挿入するか
を、前記外付け光ファイバアンプの光コネクタの接続状
態を監視している反射モニタからの信号により選択する
選択手段を有することを特徴とする。In the transmission line switching method of the present invention, when handling a high-output optical signal, the reflected light from the optical fiber is monitored on the transmission side, and when the occurrence of the disconnection of the optical connector is detected, the light is automatically transmitted. In the transmission line switching method, an external optical fiber amplifier is installed to weaken the output or recover the optical signal by automatically increasing the optical output when the recovery from the disconnection of the optical connector is detected. A fixed pattern generating means for generating a specific pattern other than the synchronization pattern of the main signal and inserting the specific pattern at a predetermined synchronization pattern position;
Which of the specific pattern output and the synchronization pattern output of the fixed pattern generation means is to be inserted into the synchronization pattern position of the main signal is determined by a reflection monitor monitoring the connection state of the optical connector of the external optical fiber amplifier. It has a selection means for selecting by a signal.
【０００９】[0009]
【発明の実施の形態】本発明の発明の実施形態につい
て、図面を参照して説明する。Embodiments of the present invention will be described with reference to the drawings.
【００１０】図１は本発明の一実施例のブロック図であ
る。送信側の端局装置には、同期パタン発生回路２と、
同期パタン挿入回路３と、電気／光変換回路４とを有
し、更に外付け光ファイバアンプから反射モニタ６の結
果を受け、同期パタンと特定パタンを切り替えるパタン
選択回路１２と、特定パタンを発生する固定パタン発生
回路１１とを含む切り替え信号発生回路１とを有してい
る。また、外付け光ファイバアンプには、光を増幅する
光ファイバアンプ５と、反射光を監視する反射モニタ６
と、反射モニタ６の結果によって光ファイバアンプ５の
出力を自動的に低下させるフィードバック制御回路７と
を有し、伝送路には、複数の伝送路接続点８を有し、受
信側の端局装置には、光／電気変換回路９、フレーム同
期回路１０とを有している。FIG. 1 is a block diagram of one embodiment of the present invention. The terminal equipment on the transmitting side includes a synchronization pattern generation circuit 2,
It has a synchronization pattern insertion circuit 3 and an electric / optical conversion circuit 4, further receives a result of the reflection monitor 6 from an external optical fiber amplifier, generates a pattern selection circuit 12 for switching between a synchronization pattern and a specific pattern, and generates a specific pattern. And a switching signal generating circuit 1 including a fixed pattern generating circuit 11. The external optical fiber amplifier includes an optical fiber amplifier 5 for amplifying light and a reflection monitor 6 for monitoring reflected light.
And a feedback control circuit 7 for automatically lowering the output of the optical fiber amplifier 5 based on the result of the reflection monitor 6. The transmission path has a plurality of transmission path connection points 8, and the reception-side terminal station The device has an optical / electrical conversion circuit 9 and a frame synchronization circuit 10.
【００１１】次に動作について説明する。送信側の外付
け光ファイバアンプでは、反射モニタ６により反射光を
常時監視しており、伝送路上の伝送路接続点８において
光コネクタ外れが検出されると、反射モニタ６にて反射
光が増大したことを検出し、この検出結果よりフィード
バック制御回路７が動作して、光ファイバアンプ５に光
出力低下制御を行う。しかし、光コネクタ外れ検出後、
送信側の反射モニタ６によって光コネクタ外れの回復を
検出させるために、光出力低下制御時にもある程度の光
出力を行わせている。光コネクタ外れが回復し、反射モ
ニタ６により反射光が低減したことを検出すると、フィ
ードバック制御回路７が再び動作し、光ファイバアンプ
５の光出力を正常状態に復旧させるようになっている。
以上の動作は従来の光コネクタ外れの監視の基本動作と
変わりはない。Next, the operation will be described. In the external optical fiber amplifier on the transmission side, the reflected light is constantly monitored by the reflection monitor 6, and when the disconnection of the optical connector is detected at the transmission line connection point 8 on the transmission line, the reflection monitor 6 increases the reflected light. The feedback control circuit 7 operates based on the detection result, and controls the optical fiber amplifier 5 to reduce the optical output. However, after detecting the disconnection of the optical connector,
In order for the reflection monitor 6 on the transmission side to detect the recovery from the disconnection of the optical connector, a certain amount of light output is performed even during the light output reduction control. When the disconnection of the optical connector is recovered and the reflection monitor 6 detects that the reflected light is reduced, the feedback control circuit 7 operates again to restore the optical output of the optical fiber amplifier 5 to a normal state.
The above operation is the same as the conventional basic operation for monitoring disconnection of the optical connector.
【００１２】本発明の伝送路切替方式は、送信側の端局
装置において、同期パタン発生回路２の出力か、オー
ル”０”のような同期パタンとは異なる特定パタンを発
生する固定パタン発生回路１１の出力かを選択するパタ
ン選択回路１２の制御を、光ファイバアンプのフィード
バック制御回路７の信号を入力することによって行うよ
うにする。According to the transmission line switching method of the present invention, a fixed pattern generation circuit for generating a specific pattern different from a synchronization pattern such as an output of a synchronization pattern generation circuit 2 or all "0" in a terminal device on a transmission side. The control of the pattern selection circuit 12 for selecting the output 11 is performed by inputting the signal of the feedback control circuit 7 of the optical fiber amplifier.
【００１３】送信側の端末装置では、外付け光ファイバ
アンプの反射モニタ６が、誤って光りコネクタ外れを検
出したとき、パタン選択回路１２により同期パタン以外
の特定パタンを同期パタン位置に挿入して送出するた
め、受信側の端末装置では同期処理回路１０にて同期外
れを検出し、同期外れを切替要因として伝送路冗長切替
が発生する。In the terminal device on the transmitting side, when the reflection monitor 6 of the external optical fiber amplifier erroneously detects the disconnection of the light connector, the pattern selection circuit 12 inserts a specific pattern other than the synchronization pattern into the synchronization pattern position. In order to transmit the data, in the terminal device on the receiving side, the synchronization processing circuit 10 detects the loss of synchronization, and the loss of synchronization is used as a switching factor to cause transmission line redundancy switching.
【００１４】[0014]
【発明の効果】以上説明したように本発明によれば、外
付け光ファイバアンプの障害によって、誤って光コネク
タ外れを検出してしまった場合、光出力低下制御がかけ
られた状態になるが、受信側で強制的に受信断を認識さ
せることによって、伝送路システムの冗長切替を起こさ
せ、不安定な伝送品質のまま継続してしまうことを防止
する効果がある。As described above, according to the present invention, when the disconnection of the optical connector is erroneously detected due to the failure of the external optical fiber amplifier, the optical output reduction control is performed. By forcibly recognizing the reception interruption on the receiving side, there is an effect of causing redundant switching of the transmission path system and preventing the transmission path system from continuing with unstable transmission quality.
【図１】本発明の一実施例のブロック図である。FIG. 1 is a block diagram of one embodiment of the present invention.
【図２】従来の技術の一実施例のブロック図である。FIG. 2 is a block diagram of an embodiment of the related art.
１ 切替信号発生回路 ２ 同期パタン発生回路 ３ 同期パタン位置挿入回路 ４ 電気／光変換回路 ５ 光ファイバアンプ ６ 反射モニタ ７ フィードバック制御回路 ８ 伝送路接続点 ９ 光／電気変換回路 １０ 同期処理回路 １０ 固定パタン発生回路 ２０ パタン選択回路 DESCRIPTION OF SYMBOLS 1 Switching signal generation circuit 2 Synchronization pattern generation circuit 3 Synchronization pattern position insertion circuit 4 Electric / optical conversion circuit 5 Optical fiber amplifier 6 Reflection monitor 7 Feedback control circuit 8 Transmission line connection point 9 Optical / electric conversion circuit 10 Synchronization processing circuit 10 Fixed Pattern generation circuit 20 Pattern selection circuit
Claims (2)
で光ファイバからの反射光をモニタし、光コネクタ外れ
の発生を検出した時には自動的に光出力を弱め、または
光コネクタ外れの回復を検出した時には自動的に光出力
を強めて光信号を復旧させる外付けの光ファイバアンプ
を配置した伝送路切替方法において、 送信側の端局装置内に、主信号の同期パタン以外の特定
パタンを生成し、所定の同期パタン位置に前記特定パタ
ンを挿入する固定パタン発生手順と、 前記固定パタン発生手順の特定パタン出力と同期パタン
出力との何れを主信号の同期パタン位置に挿入するか
を、前記外付け光ファイバアンプの光コネクタの接続状
態を監視している反射モニタからの信号により選択する
選択手順を有することを特徴とする伝送路切替方法。When a high-output optical signal is handled, a reflected light from an optical fiber is monitored on a transmission side, and when the occurrence of disconnection of an optical connector is detected, the optical output is automatically weakened or the optical connector is disconnected. When a recovery is detected, the transmission path switching method with an external optical fiber amplifier that automatically enhances the optical output and restores the optical signal. A fixed pattern generation procedure of generating a pattern and inserting the specific pattern at a predetermined synchronization pattern position; and determining which of the specific pattern output and the synchronization pattern output of the fixed pattern generation procedure is inserted at the synchronization pattern position of the main signal A transmission line switching method, wherein a selection step is selected based on a signal from a reflection monitor that monitors a connection state of an optical connector of the external optical fiber amplifier.
で光ファイバからの反射光をモニタし、光コネクタ外れ
の発生を検出した時には自動的に光出力を弱め、または
光コネクタ外れの回復を検出した時には自動的に光出力
を強めて光信号を復旧させる外付けの光ファイバアンプ
を配置した伝送路切替方式において、 送信側の端局装置内に、主信号の同期パタン以外の特定
パタンを生成し、所定の同期パタン位置に前記特定パタ
ンを挿入する固定パタン発生手段と、 前記固定パタン発生手段の特定パタン出力と同期パタン
出力との何れを主信号の同期パタン位置に挿入するか
を、前記外付け光ファイバアンプの光コネクタの接続状
態を監視している反射モニタからの信号により選択する
選択手段を有することを特徴とする伝送路切替方式。2. When handling a high-output optical signal, the transmission side monitors the reflected light from the optical fiber, and automatically detects the occurrence of disconnection of the optical connector, automatically reduces the optical output, or detects the disconnection of the optical connector. When a recovery is detected, in the transmission line switching system with an external optical fiber amplifier that automatically enhances the optical output and restores the optical signal, in the terminal equipment on the transmitting side, identification other than the synchronization pattern of the main signal is performed. A fixed pattern generation unit that generates a pattern and inserts the specific pattern at a predetermined synchronization pattern position; and which of a specific pattern output and a synchronization pattern output of the fixed pattern generation unit is inserted at the synchronization pattern position of the main signal Transmission line switching method, comprising: selecting means based on a signal from a reflection monitor that monitors the connection state of the optical connector of the external optical fiber amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27367196A JPH10126340A (en) | 1996-10-16 | 1996-10-16 | Transmission line changeover method and system therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27367196A JPH10126340A (en) | 1996-10-16 | 1996-10-16 | Transmission line changeover method and system therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10126340A true JPH10126340A (en) | 1998-05-15 |
Family
ID=17530928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27367196A Pending JPH10126340A (en) | 1996-10-16 | 1996-10-16 | Transmission line changeover method and system therefor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10126340A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003051785A (en) * | 2001-08-06 | 2003-02-21 | Hitachi Ltd | Optical changeover device with reflection monitor function capable of detecting reflection and reflection measurement system |
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|---|---|---|---|---|
| JPS59174045A (en) * | 1983-03-23 | 1984-10-02 | Nec Corp | Circuit switching system |
| JPS6212217A (en) * | 1985-07-10 | 1987-01-21 | Hitachi Ltd | Optical communication system |
| JPH02260729A (en) * | 1989-03-30 | 1990-10-23 | Nec Corp | Line switching system |
| JPH06177837A (en) * | 1992-12-10 | 1994-06-24 | Nippon Telegr & Teleph Corp <Ntt> | Output shutdown controller for high output light transmitting part |
-
1996
- 1996-10-16 JP JP27367196A patent/JPH10126340A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59174045A (en) * | 1983-03-23 | 1984-10-02 | Nec Corp | Circuit switching system |
| JPS6212217A (en) * | 1985-07-10 | 1987-01-21 | Hitachi Ltd | Optical communication system |
| JPH02260729A (en) * | 1989-03-30 | 1990-10-23 | Nec Corp | Line switching system |
| JPH06177837A (en) * | 1992-12-10 | 1994-06-24 | Nippon Telegr & Teleph Corp <Ntt> | Output shutdown controller for high output light transmitting part |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003051785A (en) * | 2001-08-06 | 2003-02-21 | Hitachi Ltd | Optical changeover device with reflection monitor function capable of detecting reflection and reflection measurement system |
| JP4676099B2 (en) * | 2001-08-06 | 2011-04-27 | 株式会社日立製作所 | Optical switching device having reflection monitor function and capable of detecting reflection, and reflection measurement system |
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