JPS59229938A - Phase synchronization system for two-route optical communication - Google Patents
Phase synchronization system for two-route optical communicationInfo
- Publication number
- JPS59229938A JPS59229938A JP58104744A JP10474483A JPS59229938A JP S59229938 A JPS59229938 A JP S59229938A JP 58104744 A JP58104744 A JP 58104744A JP 10474483 A JP10474483 A JP 10474483A JP S59229938 A JPS59229938 A JP S59229938A
- Authority
- JP
- Japan
- Prior art keywords
- phase
- circuit
- route
- routes
- optical
- 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
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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
Abstract
Description
【発明の詳細な説明】
〔発明の属する技術分野〕
本発明は、信頼性を向上するために２ルート化した光通
信の位相同期方式に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field to which the Invention Pertains] The present invention relates to a phase synchronization system for optical communications that has two routes in order to improve reliability.
このような２ル一ト化方式では、伝送路に無瞬断で信号
を送受させるために、２ルートに対し電気回路にて同時
送信および受信結合の方式をとっている。それにより、
どちらか一方のルートが切断しても無瞬断で信号を伝送
し続けることができるが、ルートのファイバーケーブル
長の差による位相差が生じるので、固定の位相等化量を
一方のルートの電気回路に付加して位相差を補正するこ
とが必要である。しかし、初期調整時の調整残やファイ
バーケーブルの季節の変化による伸縮などによる位相差
がわずかであるが残る欠点があった。In such a dual route system, in order to transmit and receive signals on the transmission line without momentary interruption, a system is adopted in which simultaneous transmission and reception are combined using electric circuits for the two routes. Thereby,
Even if one route is disconnected, signals can continue to be transmitted without momentary interruption, but a phase difference occurs due to the difference in fiber cable length between the routes. It is necessary to add it to the circuit to correct the phase difference. However, there was a drawback that a slight phase difference remained due to unadjusted initial adjustments and expansion and contraction of the fiber cable due to seasonal changes.
特に高速度データー伝送の場合には、前記位相差が相対
的に大きくなる欠点があった。Particularly in the case of high-speed data transmission, there is a drawback that the phase difference becomes relatively large.
本発明は、前記欠点を改善し、２ルート化の特長を生か
し、しかも位相差が問題となる高速度データー伝送を支
障なく適用できる２ル一ト化光通信の位相同期方式を提
供することを目的とする。It is an object of the present invention to provide a phase synchronization method for dual-route optical communication that can improve the above-mentioned drawbacks, take advantage of the features of dual routes, and can be applied without any problems to high-speed data transmission where phase differences are a problem. purpose.
本発明は、送信側にはパイロット信号を送信する手段を
備え、受信側には、前記光・電気変換回路（３，４）の
出力にそれぞれ接続され、前記パイロット信号を検出す
る検出手段（６，７）と、前記検出手段の出力に現われ
るパイロット信号の段（８）と、前記２ルートの通信信
号の位相差残を前記比較手段から送出される市、流によ
り補正する可変位相等化手段（１０）とを備えたことを
特徴とする。The present invention is provided with means for transmitting pilot signals on the transmitting side, and detecting means (6) connected to the outputs of the optical-to-electric conversion circuits (3, 4) and detecting the pilot signals on the receiving side. , 7), a pilot signal stage (8) appearing at the output of the detection means, and variable phase equalization means for correcting the residual phase difference between the communication signals of the two routes by the phase difference sent from the comparison means. (10).
本発明の実施例について、図面を参照して説明する。図
は本発明一実施例２ルート化光通信の位相同期回路図で
ある。図において、光フアイバ伝送路第１ルー・ト１お
よび第２ルート２１Ｃは、それぞれ光・電気変換回路３
．４が接続される。光・電気変換回路３には、固定位相
等化回路５が接続される。また、光・電気変換回路３．
４には、それぞれパイロット検出回路６．７が接続され
、パイロット検出回路６．７の出方は、ともに位相比較
回路８に接続される。Embodiments of the present invention will be described with reference to the drawings. The figure is a phase synchronization circuit diagram of routed optical communication according to the second embodiment of the present invention. In the figure, the optical fiber transmission line first route 1 and second route 21C are respectively optical-to-electrical conversion circuit 3.
．． 4 is connected. A fixed phase equalization circuit 5 is connected to the optical/electrical conversion circuit 3 . Also, optical/electrical conversion circuit 3.
A pilot detection circuit 6.7 is connected to each of the terminals 4 and 4, and both terminals of the pilot detection circuit 6.7 are connected to a phase comparison circuit 8.
位相比較回路８には、直流増幅回路９が接続される。固
定位相等化回路５と直流増幅回路９の各出力は、ともに
可変位相等化回路１ｏに接続される。A DC amplifier circuit 9 is connected to the phase comparison circuit 8 . The outputs of the fixed phase equalization circuit 5 and the DC amplifier circuit 9 are both connected to the variable phase equalization circuit 1o.
光・電気変換回路４と可変位相等化回路１ｏの各出力は
、ともに受信結合回路１１に接続され、受信結合回路１
１の出力は、信号出力端子１２に接続される。The respective outputs of the optical/electrical conversion circuit 4 and the variable phase equalization circuit 1o are both connected to the receiving coupling circuit 11.
The output of 1 is connected to the signal output terminal 12.
このような構成の位相同期回路の動作を説明する。図に
おいて、光フアイバー伝送路第１ルート１を伝送されて
来た光通信信号は、第１ルートの光・電気変換回路３で
″電気信号に変換され、固定位相等化回路５および可変
位相等化回路１０を経て受信結合回路１１へ入力される
。また、光フアイバー伝送路第２ルート２を伝送されて
来た光通信信号は、第２ルートの光・電気変換回路４で
電気信号に変換され、受信結合回路１１へ入力される。The operation of the phase locked circuit having such a configuration will be explained. In the figure, an optical communication signal transmitted through a first route 1 of an optical fiber transmission line is converted into an electrical signal by an optical-to-electrical conversion circuit 3 on the first route, and then a fixed phase equalization circuit 5 and a variable phase etc. The optical communication signal is input to the reception coupling circuit 11 via the conversion circuit 10.The optical communication signal transmitted through the second route 2 of the optical fiber transmission line is converted into an electrical signal by the optical-to-electrical conversion circuit 4 on the second route. and is input to the reception coupling circuit 11.
このままの回路構成では、２ルートの位相等化は固定位
相等化回路５だけで行われるため、位相差残がある。本
発明の特徴ある動作は、第１ルートの光・電気変換回路
３および第２ルートの光・電気変換回路４の各出力で電
、気信号を分岐して、パイロット検出回路６およびパイ
ロット検出回路７にてそれぞれのルートを伝送されて来
た信号内に含めであるパイロット信号をそれぞれ取り出
すことにある。２つのパイロット信号は位相比較回路８
により位相を比較され位相差に相当する大きさの電流と
して送出され、直流増幅回路９にて増幅され、その増幅
された電流により可変位相等化回路ｌＯを動作させ位相
差残を補正する。このことにより、受信結合回路１ＩＶ
ｃて２ルートの信号が結合され出力される信号出力端子
１２では、位相の同期した信号が得られる。With the circuit configuration as it is, the phase equalization of the two routes is performed only by the fixed phase equalization circuit 5, so there is a residual phase difference. The characteristic operation of the present invention is to branch the electrical and electrical signals at the respective outputs of the optical-to-electrical conversion circuit 3 of the first route and the optical-to-electrical conversion circuit 4 of the second route, and then branch the electrical and electrical signals to the pilot detection circuit 6 and the pilot detection circuit 6. 7, the pilot signals included in the signals transmitted through the respective routes are extracted. The two pilot signals are sent to the phase comparator circuit 8.
The phases are compared and sent out as a current with a magnitude corresponding to the phase difference, which is amplified by the DC amplifier circuit 9. The amplified current operates the variable phase equalization circuit IO to correct the residual phase difference. As a result, the reception coupling circuit 1IV
At the signal output terminal 12, where the signals from the two routes are combined and output, a phase-synchronized signal is obtained.
以上説明したように、本発明は、固定位相等化回路の位
相差残を補正することにより、光通信の２ルート化によ
る伝送路高信頼度化を生かしながら、しかも高速度デー
ター伝送の時に問題となる伝送路運営時の位相差残をな
くすことができる優れた効果がある。As explained above, the present invention corrects the residual phase difference of the fixed phase equalization circuit, thereby making use of the high reliability of the transmission path due to the two-route optical communication, and also solves problems during high-speed data transmission. This has the excellent effect of eliminating residual phase differences during transmission line operation.
図は本発明一実施例２ルート化光通信の位相同期回路の
ブロック構成図。
ｌ・・・光フアイバー伝送路第１ルート、２・・・光フ
アイバー伝送路第２ルート、３．４・・・光・電気変挽
回路、５・・・固定位相等化回路、６．７・・・バイロ
フト検出回路、８・・・位相比較回路、９・・・直流増
幅器、１０・・・可変位相等化回路、１１・・・受信結
合回路、１２・・・信号出力端子。
特許出願人 日本電気株式会社
代理人 弁匪士 井 出 直 孝The figure is a block configuration diagram of a phase synchronization circuit for routed optical communication according to a second embodiment of the present invention. l... Optical fiber transmission line first route, 2... Optical fiber transmission line second route, 3.4... Optical/electrical transformer circuit, 5... Fixed phase equalization circuit, 6.7 ...Biloft detection circuit, 8.. Phase comparison circuit, 9.. DC amplifier, 10.. Variable phase equalization circuit, 11.. Receiving coupling circuit, 12.. Signal output terminal. Patent applicant: NEC Corporation Representative: Naotaka Ide
Claims (1)
伝送路の受信側圧、 ２ルートのそれぞれに接続された光・電気変換回路と、 少なくとも一方のルートの前記光・電気変換回路の出力
に接続され２ルートの位相差を等化するための固定位相
等化回路と、 前記２ルートの出力を結合する受（ｉ結合回路（ｌυと を備えた２ル一ト化光通信の位相同期方式において、 送信側にはパイロット信号を送信する手段を備え・ 受信側には、 前記光・電気変換回路（３，４）の出力にそ・れぞれ接
続され、前記パイロット信号を検出する検出手段（６，
７）と、 前記検出手段の出力に現われるパイロット信号の位相差
に対応する大きさの電流を送出する比較手段（８）と、 前記２ルートの通信信号の位相差残を前記比較手段から
送出される電流により補正する可変位相等化手段（１０
）と を備えたことを特徴とする２ル一ト化光通信の位相同期
方式２．(1) Receiving side pressure of two routes of optical fiber transmission lines that transmit signals with the same content, the optical-to-electrical conversion circuits connected to each of the two routes, and the output of the optical-to-electrical conversion circuit of at least one route. A phase synchronization system for dual-route optical communication, which is equipped with a fixed phase equalization circuit for equalizing the phase difference between the two connected routes, and a receiver (i-coupling circuit (lυ) for combining the outputs of the two routes. In this case, the transmitting side includes means for transmitting a pilot signal, and the receiving side includes detecting means connected to the outputs of the optical-to-electrical conversion circuits (3, 4) and detecting the pilot signals. (6,
7); Comparing means (8) for sending out a current having a magnitude corresponding to the phase difference between the pilot signals appearing at the output of the detecting means; Variable phase equalization means (10
) A phase synchronization system for dual-route optical communication characterized by comprising: 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58104744A JPS59229938A (en) | 1983-06-10 | 1983-06-10 | Phase synchronization system for two-route optical communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58104744A JPS59229938A (en) | 1983-06-10 | 1983-06-10 | Phase synchronization system for two-route optical communication |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59229938A true JPS59229938A (en) | 1984-12-24 |
Family
ID=14388999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58104744A Pending JPS59229938A (en) | 1983-06-10 | 1983-06-10 | Phase synchronization system for two-route optical communication |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59229938A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6281824A (en) * | 1985-10-04 | 1987-04-15 | Furukawa Electric Co Ltd:The | Hitless switching method for optical line |
| FR2645376A1 (en) * | 1989-03-28 | 1990-10-05 | Pirelli Cavi Spa | Process and device for compensating for the accidental variations in optical measurement signals occurring on the optical lines for remote transmission of these signals |
| EP0407919A2 (en) * | 1989-07-11 | 1991-01-16 | Harmonic Lightwaves, Inc. | Optical transmitters linearized by means of parametric feedback |
| EP0412830A2 (en) * | 1989-08-10 | 1991-02-13 | Tektronix Inc. | Apparatus and method for reduction of intermodulation distortion in an optical fiber network |
| EP0539177A2 (en) * | 1991-10-21 | 1993-04-28 | Nec Corporation | An optical transmission system |
-
1983
- 1983-06-10 JP JP58104744A patent/JPS59229938A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6281824A (en) * | 1985-10-04 | 1987-04-15 | Furukawa Electric Co Ltd:The | Hitless switching method for optical line |
| FR2645376A1 (en) * | 1989-03-28 | 1990-10-05 | Pirelli Cavi Spa | Process and device for compensating for the accidental variations in optical measurement signals occurring on the optical lines for remote transmission of these signals |
| EP0407919A2 (en) * | 1989-07-11 | 1991-01-16 | Harmonic Lightwaves, Inc. | Optical transmitters linearized by means of parametric feedback |
| EP0412830A2 (en) * | 1989-08-10 | 1991-02-13 | Tektronix Inc. | Apparatus and method for reduction of intermodulation distortion in an optical fiber network |
| EP0539177A2 (en) * | 1991-10-21 | 1993-04-28 | Nec Corporation | An optical transmission system |
| EP0539177A3 (en) * | 1991-10-21 | 1994-10-05 | Nec Corp | An optical transmission system |
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