JPH01295537A - Optical signal disconnection detecting system - Google Patents

Optical signal disconnection detecting system

Info

Publication number
JPH01295537A
JPH01295537A JP63126738A JP12673888A JPH01295537A JP H01295537 A JPH01295537 A JP H01295537A JP 63126738 A JP63126738 A JP 63126738A JP 12673888 A JP12673888 A JP 12673888A JP H01295537 A JPH01295537 A JP H01295537A
Authority
JP
Japan
Prior art keywords
frame
frame synchronization
transmission line
signal
bit
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
Application number
JP63126738A
Other languages
Japanese (ja)
Inventor
Junichi Yugawa
湯川　純一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP63126738A priority Critical patent/JPH01295537A/en
Publication of JPH01295537A publication Critical patent/JPH01295537A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To detect disconnection of an optical fiber transmission line by adding a different frame synchronizing bit by a frame generating circuit at both opposite terminal stations and using a frame synchronizing circuit to detect a fault of synchronization with respect to the frame synchronizing bit of its own terminal station. CONSTITUTION:Two opposite terminal stations 10, 20 connected via an optical fiber transmission line 30 have respectively frame generating circuits 11, 21 and frame synchronizing circuits 15, 25. The frame generating circuits 11, 21 add different frame synchronizing bits F1, F2 and the frame synchronizing circuits 15, 25 detect synchronization error with respect to the frame synchronization bit of its own terminal station to generate optical signal disconnection alarms 107, 207. If the optical fiber transmission line 30 is broken and reflection takes place at its broken face, the frame signal 102 (including synchronizing bit F1) generated at the terminal station 10 is returned to its own station as the reflected light but since the frame synchronizing circuit is synchronous with the synchronizing bit F2 and not synchronous with the synchronizing bit F1, the alarm 107 takes place. The alarm 207 takes place at the terminal station 20 similarly.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、同一波長双方向光伝送装置の光信号断検出方
式に利用する。特に、光ファイバ伝送路が切断した場合
の光信号断検出方式に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is applied to an optical signal disconnection detection method of a bidirectional optical transmission device having the same wavelength. In particular, it relates to an optical signal disconnection detection method when an optical fiber transmission line is disconnected.

〔概要〕〔overview〕

本発明は光信号断検出方式において、 両端局のフレーム発生回路はそれぞれ異なるフレーム同
期ビットを付加するから、フレーム同期回路では光ファ
イバ伝送路の破断点で反射して戻るフレームビットに対
しては同期しないことにより、 光ファイバ伝送路が切断したことを検出できるようにし
たものである。In the optical signal disconnection detection method of the present invention, the frame generation circuits of both end stations each add different frame synchronization bits, so the frame synchronization circuit does not synchronize the frame bits reflected back at the break point of the optical fiber transmission line. This makes it possible to detect that the optical fiber transmission line has been disconnected.

〔従来の技術〕[Conventional technology]

従来、光信号断検出方式は、光伝送装置の受信部で光フ
ァイバ伝送路の切断等で生じる光信号断を検出する方法
として、たとえば、電気信号に変換された受信１ｙ号か
ら抽出されるクロック成分の有無を判断して検出してい
た。Conventionally, the optical signal disconnection detection method is a method for detecting an optical signal disconnection that occurs due to a disconnection of an optical fiber transmission line in the receiving section of an optical transmission device. Detection was done by determining the presence or absence of components.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

しかし、このような従来例の信号断検出方式では、同一
波長双方向伝送装置の光ファイバ伝送路が切断した場合
に切断端面に反射を生じるために、端局から送出された
光信号が自端局の受信部に反射光として戻され、対向す
る端局から受信されるべき光信号が断となっているにも
かかわらず、信号断検出を行うことができない欠点があ
った。However, in such conventional signal disconnection detection methods, when the optical fiber transmission line of a bidirectional transmission device with the same wavelength is disconnected, reflection occurs on the cut end surface, so that the optical signal sent from the terminal station is There is a drawback in that it is not possible to detect a signal disconnection even though the optical signal that is returned as reflected light to the reception section of the station and is to be received from the opposing terminal station is disconnected.

本発明は上記の欠点を解決するもので、光ファイバ伝送
路が切断したことを検出できる光信号断検出方式を提供
することを目的とする。The present invention solves the above-mentioned drawbacks, and aims to provide an optical signal disconnection detection method that can detect disconnection of an optical fiber transmission line.

〔問題点を解決するための手段〕[Means for solving problems]

本発明は、フレーム同期回路とを備えた光信号断検出方
式において、フレーム発生回路は、上記対向する二つの
端局について異なるフレーム同期ビットを付加する構成
であり、フレーム同期回路は、自端局のフレーム同期ビ
ットに対しては同期異常を検出する手段を含むことを特
徴とする。The present invention provides an optical signal disconnection detection method including a frame synchronization circuit, in which the frame generation circuit is configured to add different frame synchronization bits for the two opposing terminal stations, and the frame synchronization circuit is configured to add different frame synchronization bits to the two opposing terminal stations. The present invention is characterized in that it includes means for detecting a synchronization abnormality for the frame synchronization bits.

〔作用〕[Effect]

相手端局から到来する信号にはフレーム同期する。しか
し、自端局から送信され、光ファイバ伝送路の破断点で
反射して戻る信号には、フレーム同期せず異常となる。The signal arriving from the other end station is frame synchronized. However, the signal transmitted from the own end station and reflected back at the break point of the optical fiber transmission line is out of frame synchronization and becomes abnormal.

この異常を検出することにより光信号断を検出できる。By detecting this abnormality, optical signal interruption can be detected.

〔実施例〕〔Example〕

本発明の実施例について図面を参照して説明する。第１
図は本発明一実施例光信号断検出装置のブロック構成図
である。第１図において、光信号断検出装置は、光ファ
イバ伝送路３０を介して接続された対向する二つの端局
１０．２０を備え、二つの端局１０．２０はそれぞれ、
人力データ１０１　、２０１にフレーム同期ビットを付
加してフレーム信号１０２．２０２を出力するフレーム
発生回路１１．２１と、フレーム発生回路１１．２１の
出力を光信号１０３．２０３に変換する電気光変換回路
１２．２２と、電気光変換回路１２．２２の出力を光フ
ァイバ伝送路３０に光伝送路信号３０１　として送出す
る手段および光ファイバ伝送路３０から他端局の出力光
伝送路信号３０１を分離する手段を含む方向性結合器１
３．２３と、この分離する手段の出力を光信号１０４．
２０４を電気信号１０５．２０５に変換する光電気変換
回路１４．２４と、光電気変換回路１４．２４の出力に
基づいてフレーム同期をとり出力データ１０６．２０６
を出力するフレーム同期回路１５．２５とを備える ここで本発明の特徴とするところは、フレーム発生回路
１１．２１は、対向する二つの端局１旧、２０１につい
て異なるフレーム同期ビットを付加する構成であり、フ
レーム同期回路１５．２５は、自端局のフレーム同期ビ
ットに対しては同期異常を検出する手段と、同期異常を
検出する手段の検出出力に基づいて光信号断警報１０７
．２０７を発生する手段を含むことにある。Embodiments of the present invention will be described with reference to the drawings. 1st
The figure is a block diagram of an optical signal disconnection detection device according to an embodiment of the present invention. In FIG. 1, the optical signal disconnection detection device includes two opposing terminal stations 10.20 connected via an optical fiber transmission line 30, and each of the two terminal stations 10.20
A frame generation circuit 11.21 that adds a frame synchronization bit to the human data 101, 201 and outputs a frame signal 102.202, and an electro-optical conversion circuit that converts the output of the frame generation circuit 11.21 into an optical signal 103.203. 12.22, a means for sending the output of the electro-optical conversion circuit 12.22 to the optical fiber transmission line 30 as an optical transmission line signal 301, and a means for separating the output optical transmission line signal 301 of the other terminal station from the optical fiber transmission line 30. Directional coupler 1 including means
3.23 and the output of this separating means as an optical signal 104.
A photoelectric conversion circuit 14.24 converts 204 into an electrical signal 105.205, and frame synchronization is performed based on the output of the photoelectric conversion circuit 14.24 and output data 106.206.
The present invention is characterized in that the frame generation circuit 11.21 has a configuration in which the frame generation circuit 11.21 adds different frame synchronization bits to the two opposing terminal stations 1 and 201. The frame synchronization circuit 15.25 includes a means for detecting synchronization abnormality for the frame synchronization bit of its own terminal station, and an optical signal disconnection alarm 107 based on the detection output of the means for detecting synchronization abnormality.
．． 207.

このような構成の光信号断検出装置の動作について説明
する。第２図は本発明の光信号断検出装置のフレーム信
号のフレームフォーマットである。The operation of the optical signal disconnection detection device having such a configuration will be explained. FIG. 2 shows a frame format of a frame signal of the optical signal disconnection detection device of the present invention.

第２図において、Ｆ、はフレーム信号１０１のフレーム
同期ビットおよびＦ２はフレーム信号２０１のフレーム
同期ビットを示す。In FIG. 2, F indicates a frame synchronization bit of the frame signal 101, and F2 indicates a frame synchronization bit of the frame signal 201.

第１図および第２図において、端局１０で入力データ１
０１はフレーム発生回路１１でフレーム同期ビットＦ１
を付加されフレーム信号１０２となる。フレーム信号１
０２は電気光変換回路１２で光信号１０３に変換され、
方向性結合器１３を介して光伝送路信号３０１　として
光ファイバ伝送路３０に送出される。1 and 2, input data 1 is input at the terminal station 10.
01 is the frame synchronization bit F1 in the frame generation circuit 11
is added to form a frame signal 102. Frame signal 1
02 is converted into an optical signal 103 by the electro-optical conversion circuit 12,
The signal is sent to the optical fiber transmission line 30 via the directional coupler 13 as an optical transmission line signal 301 .

端局２０では、方向性結合器２３で光信号２０４を分離
し、光電気変換回路２４で電気信号２０５に変換する。In the terminal station 20, the optical signal 204 is separated by the directional coupler 23, and converted into an electrical signal 205 by the opto-electric conversion circuit 24.

電気信号２０５は、フレーム同期回路２５に人力され、
フレーム同期回路２５は、フレーム同期を行い出力デー
タ２０６を再生する。フレーム同期回路２５は、フレー
ム同期ビットＦ１には同期し、その他のフレームビット
には同期せず、光信号断警報２０７を発生する。The electrical signal 205 is manually input to the frame synchronization circuit 25,
The frame synchronization circuit 25 performs frame synchronization and reproduces the output data 206. The frame synchronization circuit 25 synchronizes with the frame synchronization bit F1, does not synchronize with other frame bits, and generates an optical signal disconnection alarm 207.

端局２０で人力データ２０１はフレーム発生回路２１で
フレーム同期ビットＦ２を付加され、フレーム信号２０
２となる。フレーム信号２０２は電気光変換回路２２で
光信号２０３に変換され、方向性結合器２３を介して光
伝送路信号３０１として光ファイバ伝送路３０に送出さ
れる。At the terminal station 20, the human data 201 is added with a frame synchronization bit F2 by the frame generation circuit 21, and the frame signal 20
It becomes 2. The frame signal 202 is converted into an optical signal 203 by the electro-optical conversion circuit 22, and sent to the optical fiber transmission line 30 as an optical transmission line signal 301 via the directional coupler 23.

端局１０においては、方向性結合器１３で光信号人力１
０４を分離し、光電気回路１４で電気信号１０５に変換
する。この信号はフレーム同期回路１５に入力され、フ
レーム同期回路１５は、フレーム同期を行い出力データ
１０６を再生する。フレーム同期回路１５は、フレーム
同期ビットＦ２には同期し、その他のフレーム同期パタ
ーンには同期せず、このとき光信帰所警報１０７を発生
する。At the terminal station 10, the directional coupler 13 connects the optical signal 1
04 is separated and converted into an electrical signal 105 by the opto-electric circuit 14. This signal is input to the frame synchronization circuit 15, and the frame synchronization circuit 15 performs frame synchronization and reproduces the output data 106. The frame synchronization circuit 15 synchronizes with the frame synchronization bit F2, but does not synchronize with other frame synchronization patterns, and generates an optical return home warning 107 at this time.

いま、光ファイバ伝送路３０が切断され、切断面で反射
を生じたとすると、端局１０で発生したフレーム信号１
０２（フレーム同期ビットＦ１を含む）は反射光として
自局に戻り、フレーム同期回路１５に人力する。フレー
ム同期回路１５はフレーム同期ピッ）Ｆ２には同期する
が、フレーム同期ビットＦ＋は同期しないので光信帰所
警報１０７が発生する。Now, if the optical fiber transmission line 30 is cut and reflection occurs at the cut surface, the frame signal 1 generated at the terminal station 10
02 (including the frame synchronization bit F1) returns to the own station as reflected light and is input to the frame synchronization circuit 15. The frame synchronization circuit 15 is synchronized with the frame synchronization bit F2, but the frame synchronization bit F+ is not synchronized, so an optical signal returning home alarm 107 is generated.

端局２０においても同様にして光信帰所警報２０７を発
生する。Similarly, the terminal station 20 generates an optical signal return home alarm 207.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、本発明は、同一波長双方向光伝送
装置で光ファイバ伝送路が切断した場合に、切断面に反
射を生じても確実に光信帰所が検出できる優れた効果が
ある。As described above, the present invention has an excellent effect in that when an optical fiber transmission line is cut in a same-wavelength bidirectional optical transmission device, the optical signal return can be reliably detected even if reflection occurs on the cut surface.

また、光ファイバ伝送路に無反射のフィジカルコンタク
トコネクタを使用し、このコネクタをはずした場合に端
面反射を生じるが、この場合にも光信号断検出に関して
同様な効果がある。Further, when a non-reflection physical contact connector is used in the optical fiber transmission line and the connector is disconnected, end face reflection occurs, and in this case, the same effect can be obtained regarding optical signal disconnection detection.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明一実施例光信号断検出回路のブロック構
成図。 第２図は本発明の光信号断検出回路のフレーム信号のフ
レームフォーマット。 １０．２０・・・端局、１１．２１・・・フレーム発生
回路、１２．２２・・・電気光変換回路、１３．２３・
・・方向性結合器、１４．２４・・・光電気変換回路、
１５．２５・・・フレーム同期回路、３０・・・光ファ
イバ伝送路、１０１．２０１・・・入力データ、１０２
．２０２・・・フレーム信号、１０３．１０４．２０３
．２０４・・・光信号、１０５．２０５・・・電気信号
、１０６．２０６・・・出力データ、１０７．２０７・
・・光信帰所警報、３０１・・・先任送路信号。 特許出願人　日本電気株式会社、 代理人　　弁理士　井　出　直　孝FIG. 1 is a block diagram of an optical signal disconnection detection circuit according to an embodiment of the present invention. FIG. 2 shows the frame format of the frame signal of the optical signal disconnection detection circuit of the present invention. 10.20...Terminal station, 11.21...Frame generation circuit, 12.22...Electro-optical conversion circuit, 13.23.
...Directional coupler, 14.24...Optoelectrical conversion circuit,
15.25...Frame synchronization circuit, 30...Optical fiber transmission line, 101.201...Input data, 102
．． 202...Frame signal, 103.104.203
．． 204... Optical signal, 105.205... Electric signal, 106.206... Output data, 107.207...
...Mitsushin return home warning, 301...senior sending route signal. Patent applicant: NEC Corporation, agent: Naotaka Ide, patent attorney

Claims (1)

【特許請求の範囲】 １、光ファイバ伝送路を介して接続された対向する二つ
の端局を備え、 この二つの端局はそれぞれ、 入力データにフレーム同期ビットを付加してフレーム信
号を出力するフレーム発生回路と、上記光ファイバ伝送
路から到来する信号に基づいてフレーム同期をとるフレ
ーム同期回路とを備えた光信号断検出方式において、 上記フレーム発生回路は、上記対向する二つの端局につ
いて異なるフレーム同期ビットを付加する構成であり、 上記フレーム同期回路は、自端局のフレーム同期ビット
に対しては同期異常を検出する手段を含む ことを特徴とする光信号断検出方式。[Claims] 1. Two opposing terminal stations connected via an optical fiber transmission line, each of which adds a frame synchronization bit to input data and outputs a frame signal. In an optical signal disconnection detection method comprising a frame generation circuit and a frame synchronization circuit that performs frame synchronization based on a signal arriving from the optical fiber transmission line, the frame generation circuit is different for the two opposing terminal stations. An optical signal disconnection detection system having a configuration in which a frame synchronization bit is added, wherein the frame synchronization circuit includes means for detecting a synchronization abnormality with respect to the frame synchronization bit of its own terminal station.
JP63126738A 1988-05-23 1988-05-23 Optical signal disconnection detecting system Pending JPH01295537A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63126738A JPH01295537A (en) 1988-05-23 1988-05-23 Optical signal disconnection detecting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63126738A JPH01295537A (en) 1988-05-23 1988-05-23 Optical signal disconnection detecting system

Publications (1)

Publication Number Publication Date
JPH01295537A true JPH01295537A (en) 1989-11-29

Family

ID=14942676

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63126738A Pending JPH01295537A (en) 1988-05-23 1988-05-23 Optical signal disconnection detecting system

Country Status (1)

Country Link
JP (1) JPH01295537A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5325366A (en) * 1990-10-18 1994-06-28 Fujitsu Limited Alarm system for station in a communications system using asynchronous third-digital-stage signal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5325366A (en) * 1990-10-18 1994-06-28 Fujitsu Limited Alarm system for station in a communications system using asynchronous third-digital-stage signal

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