JPH0482335A - Fail safe type optical transmission reception system and its optical circuit - Google Patents
Fail safe type optical transmission reception system and its optical circuitInfo
- Publication number
- JPH0482335A JPH0482335A JP2195022A JP19502290A JPH0482335A JP H0482335 A JPH0482335 A JP H0482335A JP 2195022 A JP2195022 A JP 2195022A JP 19502290 A JP19502290 A JP 19502290A JP H0482335 A JPH0482335 A JP H0482335A
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- Prior art keywords
- optical
- circuit
- switch
- transmission line
- fiber transmission
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- 230000003287 optical effect Effects 0.000 title claims abstract description 255
- 230000005540 biological transmission Effects 0.000 title claims abstract description 68
- 239000013307 optical fiber Substances 0.000 claims abstract description 51
- 238000012360 testing method Methods 0.000 claims abstract description 29
- 230000005856 abnormality Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 31
- 238000004891 communication Methods 0.000 abstract description 7
- 230000008878 coupling Effects 0.000 description 10
- 238000010168 coupling process Methods 0.000 description 10
- 238000005859 coupling reaction Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 230000001902 propagating effect Effects 0.000 description 5
- 230000000644 propagated effect Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- Detection And Prevention Of Errors In Transmission (AREA)
Abstract
Description
【発明の詳細な説明】
J産業上の利用分野]
本発明は、局と加入者間を光ファイバ伝送路で接続した
伝送方式において、送出光信号をモニタする回路、上記
伝送路を試験監視する回路。[Detailed Description of the Invention] Field of Industrial Use] The present invention provides a circuit for monitoring an outgoing optical signal in a transmission system in which a station and a subscriber are connected by an optical fiber transmission line, and a circuit for testing and monitoring the transmission line. circuit.
障害時に光経路を切り替えるための光スイッチを含んだ
光送受信方式及びその光回路に関するものである。The present invention relates to an optical transmission/reception system including an optical switch for switching optical paths in the event of a failure, and its optical circuit.
「従来の技術]
局と加入者間を1本の光ファイバで結んで、双方向伝送
する光加入者伝送システムが世界的に研究されている。``Prior Art'' Optical subscriber transmission systems that connect a station and a subscriber with a single optical fiber and perform bidirectional transmission are being researched around the world.
このシステムを実現する上では、光送受信装置、光ファ
イバ伝送路の信頼性確保が重要である。In realizing this system, it is important to ensure the reliability of the optical transmitter/receiver and the optical fiber transmission line.
この信頼性を確保する方式として、第3図に示す構成の
ものか検討されている(特開昭62−273428号)
。同図において、32は電気−光変換器、33は光信号
、34は光分波器、35は光試験回路、36は光ファイ
バ伝送路、37は光分波器、38は光−電気変換器、3
9は端末装置、44は光−電気変換器、45はモニタ装
置、46は光分岐回路、47は光パルス試験器、48は
光合流口路て゛ある。As a method to ensure this reliability, the configuration shown in Figure 3 is being considered (Japanese Patent Laid-Open No. 62-273428).
. In the figure, 32 is an electrical-to-optical converter, 33 is an optical signal, 34 is an optical demultiplexer, 35 is an optical test circuit, 36 is an optical fiber transmission line, 37 is an optical demultiplexer, and 38 is an optical-to-electrical converter. vessel, 3
9 is a terminal device, 44 is an optical-electrical converter, 45 is a monitor device, 46 is an optical branch circuit, 47 is an optical pulse tester, and 48 is an optical junction path.
局の電気−光変換器32から送出する光信号〈矢印33
で示す〉は、光分岐回路46を介してモニタ装置45で
モニタされる。また光ファイバ伝送路36の障害点探索
は、光パルス試験器47から、試験光パルスを、反射ミ
ラーの光合流口路48を介して光ファイバ伝送路36に
送出し、この試験光パスルによって生じる光ファイバ伝
送路36中での後方散乱光を、上記光合浅凹FI?14
8を介し光パルス試験回路47で受信して行われる。Optical signal sent from the electrical-to-optical converter 32 of the station <arrow 33
is monitored by the monitor device 45 via the optical branch circuit 46. In addition, to search for a fault point in the optical fiber transmission line 36, a test light pulse is sent from the optical pulse tester 47 to the optical fiber transmission line 36 via the optical junction path 48 of the reflection mirror, and the test light pulse generated by this test light pulse is The backscattered light in the optical fiber transmission line 36 is transmitted through the optical coupling shallow concave FI? 14
The optical pulse test circuit 47 receives the signal through the optical pulse test circuit 8 and performs the test.
!発明が解決しようとする課題]
第3図の構成では、局f則から送出する光信号及び光フ
ァイバ伝送路の状態を監視することができる。しかし、
障害か発生した場合に、予備の装置に切り替えて局−加
入者間の通信を維持する構成が含まれていない。! Problems to be Solved by the Invention] With the configuration shown in FIG. 3, it is possible to monitor the optical signal sent out and the state of the optical fiber transmission line based on the local f law. but,
There is no provision for switching to a spare device to maintain communication between the station and the subscriber in the event of a failure.
本発明の目的は、前記した従来技術の問題点を解消し、
光ファイバ伝送路を試験監視する回路は勿論のこと、障
害時に光経路を切り替えるための光スイッチを含んだフ
ェールセーフ型光送受信方式及びその光回路を提供する
ことにある。The purpose of the present invention is to solve the problems of the prior art described above,
The object of the present invention is to provide a fail-safe optical transmission/reception system including not only a circuit for testing and monitoring an optical fiber transmission line but also an optical switch for switching the optical path in the event of a failure, and an optical circuit thereof.
[課題を解決するための手段]
本発明のフェールセーフ型光送受信方式は、局と加入者
間を主系及び予備系の光ファイバ伝送路で接続し:局側
には、主系回路及び予備系回路として、波長λ1及びλ
2の光信号を送出及び受信する光送受信回路、該光信号
を合分波する光合分波回路、光ファイバ伝送路へ波長λ
3の光パルス信号を送出して光ファイバ伝送路の障害を
試験監視する光試験回路を設けると共に、これら主系及
び予備系回路を切り替える光スイッチを設け:加入者側
には、主系及び予備系の光ファイバ伝送路を切り替える
光スイッチ、光合分波回路、波長λ2及びλ1の光信号
を送出及び受信する光送受信回路を設け:上記光試験回
路により光ファイバ伝送路の障害か検出されたときは、
局側及び加入者側に設けた上記光スイッチにより、光フ
ァイバ伝送路を主系から予備系に切り替えるものである
。[Means for Solving the Problems] The fail-safe optical transmission/reception system of the present invention connects a station and a subscriber with a main system and a protection optical fiber transmission line. As a system circuit, the wavelengths λ1 and λ
An optical transmitter/receiver circuit that sends and receives optical signals of 2, an optical multiplexer/demultiplexer circuit that multiplexes and demultiplexes the optical signals, and a wavelength λ to the optical fiber transmission line.
An optical test circuit is installed to test and monitor failures in the optical fiber transmission line by sending out optical pulse signals (3), and an optical switch is installed to switch between the main and backup circuits. An optical switch that switches the optical fiber transmission line of the system, an optical multiplexing/demultiplexing circuit, and an optical transmitting/receiving circuit that sends and receives optical signals of wavelengths λ2 and λ1 are installed: When a fault in the optical fiber transmission line is detected by the above optical test circuit. teeth,
The optical switches provided on the station side and the subscriber side are used to switch the optical fiber transmission line from the main system to the backup system.
この場合、上記光ファイバ伝送路の主系から予備系への
切り替えは、光試験回路の出力を局側の光スイッチへフ
ィードバック制御することにより行うことか好ましい。In this case, it is preferable that the switching of the optical fiber transmission line from the main system to the standby system is performed by feedback control of the output of the optical test circuit to the optical switch on the station side.
また、局側に、更に主系及び予備系の光経路に送出光信
号をモニタする光モニタ回路を設け、該光モニタ回路に
より主系の光送受信回路の光出力に異常が検出されたと
き、当該光送受信回路を予備系に切り替え且つ光スイッ
チも予備系に切り替えることができる。この場合も、局
側における光送受信回路と光スイッチの予備系への切り
替えは、上記光モニタ回路の出力を局側め光スイッチと
局側の光送受信回路の制御回路とにフィードバック制御
することにより行うことが好ましい。In addition, an optical monitor circuit is further provided on the station side to monitor the transmitted optical signal in the optical path of the main system and the backup system, and when the optical monitor circuit detects an abnormality in the optical output of the optical transmitter/receiver circuit of the main system, The optical transmitter/receiver circuit can be switched to a standby system, and the optical switch can also be switched to a standby system. In this case as well, the switching of the optical transmitter/receiver circuit and optical switch to the standby system at the central office is achieved by feedback control of the output of the optical monitor circuit to the optical switch at the central office and the control circuit of the optical transmitter/receiver circuit at the central office. It is preferable to do so.
上記局側及び加入者側の光回路を含むフェールセーフ型
光回路は光導波路で構成することかできる。The fail-safe optical circuit including the optical circuits on the station side and the subscriber side can be constructed of optical waveguides.
二作用]
本発明の要旨は、局側に予備の光送信回路、光合分波回
路、光試験回路、光スイッチを、加入者側に光スイッチ
を追加的に設け、また予備の光ファイバ伝送路を局と加
入者間に設け、伝送路の障害発生時に、局及び加入者側
に設けた光スイッチにより、予備の光ファイバ伝送路に
切り替えるようにしたものである。[Two functions] The gist of the present invention is to additionally provide a backup optical transmission circuit, an optical multiplexing/demultiplexing circuit, an optical test circuit, and an optical switch on the central office side, and an optical switch on the subscriber side, and to provide a backup optical fiber transmission line. is installed between the station and the subscriber, and when a failure occurs in the transmission line, an optical switch installed at the station and subscriber side switches to a backup optical fiber transmission line.
また、更に局側の主系及び予備系に光モニタ回路を設け
、該光モニタ回路により主系の光出力異常が検出された
とき、光送受信回路及び光スイッチを予備系に切り替え
るようにしたら・のである。Furthermore, if an optical monitor circuit is provided in the main system and the backup system on the station side, and when an optical output abnormality in the main system is detected by the optical monitor circuit, the optical transmitter/receiver circuit and the optical switch are switched to the backup system. It is.
従って、障害が発生した場合に、予備の装置に切り替え
て局−加入者間の通信を維持することができる。Therefore, in the event of a failure, it is possible to switch to a spare device and maintain communication between the station and the subscriber.
これらの形態において、光試験回路の出力を局側の光ス
イッチへフィードバックし、或いは、光モニタ回路の出
力を光スイッチと制御回路とにフィードバックすること
により、上記光ファイバ伝送路或いは光送受信回路の主
系から予備系への切り替えを、自動的に行うことができ
る。In these forms, the output of the optical fiber transmission line or the optical transceiver circuit is controlled by feeding back the output of the optical test circuit to the optical switch at the station side, or by feeding back the output of the optical monitor circuit to the optical switch and the control circuit. Switching from the main system to the standby system can be performed automatically.
「実施例] 以下、本発明を図示の実施例に基づいて説明する。"Example] Hereinafter, the present invention will be explained based on illustrated embodiments.
第1図に光試験回路付き加入者伝送方式のシステム構成
を示す、これは、1本の光ファイバ伝送R(6aあるい
は6b)内を、異なった波長λ1及びλ2の光信号を、
矢印17及び18のごとく双方向に伝送させる構成例で
・あり、図中の番号の後に付くa及びbは、主系用及び
予備系用の区別表示をするものである。Figure 1 shows the system configuration of a subscriber transmission system with an optical test circuit.This system allows optical signals of different wavelengths λ1 and λ2 to be transmitted within one optical fiber transmission R (6a or 6b).
This is an example of a configuration in which data is transmitted in both directions as shown by arrows 17 and 18, and the a and b added after the numbers in the figure indicate whether the data is for the main system or for the backup system.
第1図の左側に示す局側からは、主系の光送受信回路の
電気−光変換回路1aから波長λ1の光信号が送出され
る。この光信号は、光合分波回路2a、光スイッチ4.
光合分波回路5aを経た後、主系の光ファイバ伝送路6
aを通して、矢印17のごとく、加入者側に送られる。From the station side shown on the left side of FIG. 1, an optical signal of wavelength λ1 is sent out from the electrical-to-optical conversion circuit 1a of the main optical transceiver circuit. This optical signal is sent to the optical multiplexing/demultiplexing circuit 2a, the optical switch 4.
After passing through the optical multiplexing/demultiplexing circuit 5a, the main optical fiber transmission line 6
a, and is sent to the subscriber side as shown by arrow 17.
加入者側では、この光信号が、光スイッチ7、光合分波
回路8を介して、光送受信回路の光−電気変換回路9に
より受信される。On the subscriber side, this optical signal is received by an optical-to-electrical conversion circuit 9 of an optical transmitting/receiving circuit via an optical switch 7 and an optical multiplexing/demultiplexing circuit 8.
一方、加入者側からは、光送受信回路の電気光変換回路
10から、波長λ2の光信号が、光合分波回路8.光ス
イッチ7を経た後、主系の光ファイバ伝送路6aを通し
て、矢印18のごとく局側に送られる。そして、光合分
波回路5a、光スイッチ4.光合分波回路2aを介して
、光−電気変換回路11aにより受信される。On the other hand, from the subscriber side, an optical signal with wavelength λ2 is transmitted from the electro-optical conversion circuit 10 of the optical transmitting/receiving circuit to the optical multiplexing/demultiplexing circuit 8. After passing through the optical switch 7, the signal is sent to the office side as indicated by an arrow 18 through the main optical fiber transmission line 6a. Then, an optical multiplexing/demultiplexing circuit 5a, an optical switch 4. The signal is received by the optical-to-electrical conversion circuit 11a via the optical multiplexing/demultiplexing circuit 2a.
この構成において、局側の主系の電気−光変換回路1a
の光出力は、主系の光モニタ回路3aによりモニタされ
、その光出力が減少したかどうか或いはゼロになったか
どうか等の異常状態が監視される。光モニタ回路3aに
より異常が検出された場合には、主系の電気−光変換回
路1aの代わりに、予備系の電気−光変換回路1bが動
作し、また光スイッチ4も切り替えられ、これにより予
備系の電気−変換回路1bの光出力か、光合分波回路2
b、光スイッチ4.光合変波回#I5.光ファイバ伝送
路6aを通して、加入者側に送られる。In this configuration, the main electrical-to-optical conversion circuit 1a on the station side
The light output of the main system is monitored by the main optical monitor circuit 3a, and abnormal conditions such as whether the light output has decreased or become zero are monitored. When an abnormality is detected by the optical monitor circuit 3a, the backup electric-optical converter circuit 1b operates instead of the main electric-optical converter circuit 1a, and the optical switch 4 is also switched. The optical output of the backup electrical conversion circuit 1b or the optical multiplexing/demultiplexing circuit 2
b. Optical switch 4. Optical multiplexing wave cycle #I5. It is sent to the subscriber side through the optical fiber transmission line 6a.
尚、上記光モニタ回路3aの出力信号に応じた予備系へ
の切替え、即ち、電気−光変換回路1aから1bへの切
り替え及び光スイッチ4の切り替えに関する切替制御回
路は、この図には省略しであるが、通常の電気比較回路
を用いることによって容易に実現することかできる。Note that the switching control circuit for switching to the standby system according to the output signal of the optical monitor circuit 3a, that is, switching from the electric-to-optical conversion circuit 1a to 1b and switching the optical switch 4, is omitted from this figure. However, it can be easily realized by using an ordinary electrical comparator circuit.
次に、主系の光ファイバ伝送路6aの障害点探索は、主
系の光試験回路23aから波長λ3の試験光パルス信号
を、光合分波回路5aを介して光ファイバ伝送R6aに
送出し、この試験光パルスによって生じる光ファイバ伝
送路6a中での後方散乱光を、上記光合分波回路5aを
介して光試験回路23aて受信することで行われる。こ
の光ファイバ伝送路6aの断線、折れ1等に依存した損
失増加箇所や破断点箇所の試験方法は、通常よく用いら
れている方法である。Next, to search for a fault point in the main optical fiber transmission line 6a, a test optical pulse signal of wavelength λ3 is sent from the main optical test circuit 23a to the optical fiber transmission R6a via the optical multiplexing/demultiplexing circuit 5a. This is performed by receiving backscattered light in the optical fiber transmission line 6a caused by this test light pulse by the optical test circuit 23a via the optical multiplexing/demultiplexing circuit 5a. This method of testing loss increase locations and breakage points depending on disconnections, bends, etc. of the optical fiber transmission line 6a is a commonly used method.
上記方法で主系の光ファイバ伝送路6aの故障を検出し
、通信に異常をきたすことを確認した場合には、局側の
光スイッチ4及び加入者側の光スイッチ7を作動させて
予備系の光ファイバ伝送路6bに切り替え、電気−光変
換回路1aの光出力信号(波長λ1)を、光合分波回路
2a、光スイyチ4.光合分波回路5b、光ファイバ伝
送路6bを介して加入者側に送る。そして加入者側では
、予備系の光ファイバ伝送N6bよつ受けた光信号を、
光スイッチ7、光合分波回路8を通して、光電気変換回
路9で受信する。If a failure in the main optical fiber transmission line 6a is detected using the above method and it is confirmed that an abnormality will occur in communication, the optical switch 4 on the station side and the optical switch 7 on the subscriber side are activated and the backup system is activated. The optical fiber transmission line 6b is switched to the optical fiber transmission line 6b, and the optical output signal (wavelength λ1) of the electrical-optical conversion circuit 1a is transferred to the optical multiplexing/demultiplexing circuit 2a, the optical switch 4. It is sent to the subscriber side via the optical multiplexing/demultiplexing circuit 5b and the optical fiber transmission line 6b. Then, on the subscriber side, the optical signal received through the backup optical fiber transmission N6b is
The signal is received by a photoelectric conversion circuit 9 through an optical switch 7 and an optical multiplexing/demultiplexing circuit 8.
尚、光試験回路23aの出力信号による光スイツチ4及
び7の切替制御回路もこの図には省略しであるが、通常
の電気比較回路によって容易に実現することができる。Although the switching control circuit for the optical switches 4 and 7 based on the output signal of the optical test circuit 23a is also omitted in this figure, it can be easily realized by a normal electrical comparator circuit.
上記のように、本発明の双方向伝送方式では、光モニタ
回路3aの出力信号によって、電気−光変換回路1a及
び光−電気変換回路11aで構成される主系の光送受信
回路から、電気−光変換回路1b及び光−電気変換回路
11bで構成される予備系の光送受信回路へと切り替え
られ、また光スイッチ4I:J、主系の光ファイバ伝送
路6aから予備系の光ファイバ伝送路6bへと切り替え
られる。更に、光試験回路23aが主系の光ファイバ伝
送路6aの異常を検出したときは、その出力信号によっ
て、局側の光スイッチ4及び加入者側の光スイッチ7が
、共に、主系の光ファイバ伝送路6aから予備系の光フ
ァイバ伝送路6bへと切り替えられる。As described above, in the bidirectional transmission system of the present invention, the output signal of the optical monitor circuit 3a allows the electrical signal to be transmitted from the main optical transmitter/receiver circuit composed of the electrical-optical converter circuit 1a and the optical-electrical converter circuit 11a. It is switched to a backup optical transmission/reception circuit composed of an optical conversion circuit 1b and an optical-electrical conversion circuit 11b, and the optical switch 4I:J switches from the main optical fiber transmission line 6a to the backup optical fiber transmission line 6b. can be switched to. Furthermore, when the optical test circuit 23a detects an abnormality in the main optical fiber transmission line 6a, its output signal causes both the optical switch 4 on the central office side and the optical switch 7 on the subscriber side to The fiber transmission line 6a is switched to the backup optical fiber transmission line 6b.
第2図は、フェールセーフ型の局側の光回路の実施例を
示したものである。ここでは導波路型光回路として構成
されており、カラス光導波路1強誘電体光導波路、半導
体光導波路のいずれか、あるいはこれらの組み合わせに
よって実現することができる。この光導波路は埋め込み
形、ロッジ形。FIG. 2 shows an embodiment of a fail-safe type central office optical circuit. Here, it is configured as a waveguide type optical circuit, and can be realized by either a glass optical waveguide 1, a ferroelectric optical waveguide, a semiconductor optical waveguide, or a combination thereof. This optical waveguide is a buried type, a lodge type.
装荷形、盛上げ形、拡散形、のいずれか、あるいはこれ
らの組み合わせを用いることができる。Any one of a loaded type, a raised type, a diffused type, or a combination thereof can be used.
次に、個々の光回路について説明する。Next, individual optical circuits will be explained.
2aは主系の、2bは予備系の光合分波回路であり、そ
れぞれ波長λ1とλ2の光信号を合分波する機能を有す
る。ここでは、主系の光合分波回路2aは同−構造の光
方向性結合回路15a。2a is a main optical multiplexing/demultiplexing circuit, and 2b is a backup optical multiplexing/demultiplexing circuit, each having a function of multiplexing/demultiplexing optical signals of wavelengths λ1 and λ2. Here, the main optical multiplexing/demultiplexing circuit 2a is an optical directional coupling circuit 15a having the same structure.
16a及び24aからなり、予備系の光合分波回路2b
は同−構造の光方向性結合回路15b。A standby optical multiplexing/demultiplexing circuit 2b consisting of 16a and 24a.
is an optical directional coupling circuit 15b having the same structure.
16b及び24bからなる。即ち、電気−光変換回路1
a<lb)からの波長λ1の光信号は、光方向性結合回
路15a(15b)、24a(24b)を通って、矢印
17a (19a)。It consists of 16b and 24b. That is, the electrical-optical conversion circuit 1
The optical signal with the wavelength λ1 from the source a<lb) passes through the optical directional coupling circuits 15a (15b) and 24a (24b) and is directed to the arrow 17a (19a).
17b (19b)のごとく伝搬し、矢印18a(20
a)のごとく伝搬してきた波長λ2の光信号は、光方向
性結合回路24a (24b)。17b (19b), and the arrow 18a (20
The optical signal of wavelength λ2 propagated as shown in a) is sent to the optical directional coupling circuit 24a (24b).
16a(16b)を矢印18b (20b)のごとく伝
搬し、光−電気変換回路11a(llb>で電気信号に
変換される。16a (16b) as shown by the arrow 18b (20b), and is converted into an electrical signal by the optical-to-electrical conversion circuit 11a (llb>).
上記光方向性結合回路15a、15bは、波長λ1の光
信号をモニタする光モニタ回路を兼用している。即ち、
電気−光変換回路1a(lb)の光出力信号は、光方向
性結合回路15a(15b)によって矢印17a (1
9a)のごとく伝搬するが、矢印17c (19c)方
向へも、−20dB程度減衰した光信号が洩れて伝搬す
る。従って、この漏洩光の光強度を、光モニタ用の光−
電気変換回路30a (30b)によって検出すること
によって、電気−光変換回路1a (lb)の異常状態
を判定することができる。そして、上記光モニタ用光−
電気変換回路30a (30b)の出力信号は、光スイ
ッチ4の駆動用電圧源13にフィードバックされて光ス
イッチ4の切替え制御信号として使用されると共に、光
送受信回路の制御回路100へもフィードバックされ、
主系の電気−光変換回路1a及び光−電気変換回路11
aから、予備系の電気−光変換回路1b及び光−電気変
換回路11bへの切替え制御Xl信号として使用される
。The optical directional coupling circuits 15a and 15b also serve as optical monitor circuits that monitor the optical signal of wavelength λ1. That is,
The optical output signal of the electrical-optical conversion circuit 1a (lb) is converted into an arrow 17a (1) by the optical directional coupling circuit 15a (15b).
9a), but an optical signal attenuated by about -20 dB also leaks and propagates in the direction of arrow 17c (19c). Therefore, the light intensity of this leaked light is
By detecting it with the electrical conversion circuit 30a (30b), it is possible to determine the abnormal state of the electrical-optical conversion circuit 1a (lb). And the above light monitoring light -
The output signal of the electrical conversion circuit 30a (30b) is fed back to the driving voltage source 13 of the optical switch 4 and used as a switching control signal for the optical switch 4, and is also fed back to the control circuit 100 of the optical transmitting/receiving circuit.
Main electrical-optical conversion circuit 1a and optical-electrical conversion circuit 11
a is used as a switching control signal Xl to the backup electric-optical conversion circuit 1b and optical-electrical conversion circuit 11b.
尚、14はアース電極′である6
4aは主系の光方向性結合回路、4bは予備系の光方向
性結合回路であり、矢印22a (22b)のように伝
搬する波長λ3の光信号を、矢印17b (19b)、
18a (20a>のごとく分波して伝搬させ、波長λ
1及びλ2の光信号は分波させない構造のものである。In addition, 14 is a ground electrode', 4a is a main system optical directional coupling circuit, and 4b is a backup system optical directional coupling circuit, which receives an optical signal of wavelength λ3 propagating as shown by arrow 22a (22b). , arrow 17b (19b),
18a (20a>) and propagate the wavelength λ
The optical signals of λ1 and λ2 are of a structure in which they are not demultiplexed.
光試験回路5a(5b)の出力信号は、制御回路60a
(60b)を通して、上記電圧源13にフィードバッ
クされる。The output signal of the optical test circuit 5a (5b) is transmitted to the control circuit 60a.
(60b) is fed back to the voltage source 13.
次に、光スイッチ4について説明する。Next, the optical switch 4 will be explained.
これは全く同じ構造寸法を持つ2つの単一モード光導波
路を近接して配置させ、結合領域にプレーナ電極21a
、21bを配置したものである(西原、春名、栖原、“
光集積回路”オーム社発行、昭和60年2月25日第1
版第1刷発行、 pp、304〜306)。In this method, two single mode optical waveguides having exactly the same structural dimensions are placed close to each other, and the coupling region is provided with a planar electrode 21a.
, 21b (Nishihara, Haruna, Suhara, “
“Optical Integrated Circuit” published by Ohmsha, February 25, 1985, No. 1
First edition published, pp. 304-306).
これは、電圧源13から印加電圧Vを印加することによ
って、2つの先導波路を伝搬する合波路に伝搬定数差Δ
βを生じさせ、例えば光導波路2ヲa内を伝搬している
光信号を光導波Fl@ 26 aあるいは26b内へ伝
搬させることができる。また、光導波路26a内を伝搬
している光信号を、光導波路25aあるいは25b内へ
伝搬させることができる。即ち、光導波路25a (2
6a)内を伝搬している光信号か光導波路26b (2
5b)内へスイッチングされる条件として、
Δβ=0゜
L/j’=2α〒1 (α=o、1,2.) ″
・・・(1)
を満足するように印加電圧Vを調整し、また、光導波路
25a (26a)内を伝搬している光信号が光導波路
25a (26a)内へスイッチングされる条件として
、
・・・(2)
但し1.l!:結合部の長さ。By applying the applied voltage V from the voltage source 13, the propagation constant difference Δ
For example, an optical signal propagating in the optical waveguide 2woa can be propagated into the optical waveguide Fl@26a or 26b. Furthermore, the optical signal propagating within the optical waveguide 26a can be propagated into the optical waveguide 25a or 25b. That is, the optical waveguide 25a (2
6a) is the optical signal propagating in the optical waveguide 26b (2
5b) As a condition for switching to Δβ=0゜L/j'=2α〒1 (α=o, 1, 2.)''
... (1) The applied voltage V is adjusted to satisfy the following conditions, and the conditions for the optical signal propagating in the optical waveguide 25a (26a) to be switched into the optical waveguide 25a (26a) are: ...(2) However, 1. l! : Length of joint.
L:完全結合長。L: complete bond length.
を満足するように、印加電圧■を調整することにより、
光スイツチング動作を行わせることができる。By adjusting the applied voltage ■ to satisfy
Optical switching operations can be performed.
上記実施例において、例えば波長λ1=1.3μm1λ
2=1.55μm、λ3=1.65μmか用いられる。In the above embodiment, for example, the wavelength λ1=1.3μm1λ
2=1.55 μm and λ3=1.65 μm are used.
本発明は、上記実施例に限定されない。例えばλ1 =
1.52μm、λ2=1.56μm、λ3 =1.65
μmを用いた場合には、光合分波図R2a、、2bは例
えばマツハラニーダ型の光合分波回路を用いることによ
って実現することができる。The present invention is not limited to the above embodiments. For example, λ1 =
1.52μm, λ2=1.56μm, λ3=1.65
When μm is used, the optical multiplexing/demultiplexing diagrams R2a, 2b can be realized by using, for example, a Matsuhara Kneader type optical multiplexing/demultiplexing circuit.
光スイッチ4には、上記実施例の構成の他に、例えば半
導体材料を用いた交叉型光スイッチ、光ファイバ型の機
械式光スイッチ、等を用いても良い。また光合分波回路
4a、4bも光ファイバ型のものを用いても良い。In addition to the configuration of the above embodiment, the optical switch 4 may be, for example, a cross-type optical switch using a semiconductor material, an optical fiber type mechanical optical switch, or the like. Further, the optical multiplexing/demultiplexing circuits 4a and 4b may also be of optical fiber type.
尚、第2図は局側の光回路について述べたが、加入者側
の光回路(光スイッチ7、光合分波回路8、光−電気変
換回路9.及び電気−光変換回路10)も同様に光導波
路で構成できることは明かである。Although FIG. 2 describes the optical circuit on the central office side, the optical circuit on the subscriber side (optical switch 7, optical multiplexing/demultiplexing circuit 8, optical-to-electrical conversion circuit 9, and electric-to-optical conversion circuit 10) is similar. It is clear that it can be constructed from optical waveguides.
[発明の効果1
以上述べたように、本発明は次のような優れた効果を奏
することができる。[Effects of the Invention 1 As described above, the present invention can produce the following excellent effects.
(1)完全に二重化されたフェールセーフ型の構成にな
っているので、光ファイバ伝送路に障害が発生した場合
に、予錨系に切り替えて局−加入者間の通信を維持する
ことができる。光モニタ回路を備えた形態では更に送受
信回路に障害が発生した場合にら、子幅系に切り替えて
局−加入者間の通信を維持することができる。従って、
信頼性の高い光送受信方式を実現することができる。(1) It has a completely redundant fail-safe configuration, so if a failure occurs in the optical fiber transmission line, it can switch to the pre-anchor system and maintain communications between the station and subscribers. . In addition, in the case where an optical monitor circuit is provided, even if a failure occurs in the transmitter/receiver circuit, it is possible to switch to a subband system and maintain communication between the station and the subscriber. Therefore,
A highly reliable optical transmission and reception system can be realized.
(2)フィードバック制御によるフェールセーフ型光送
受信方式とした形態では、局−加入者間の通信を切断す
ることはなく実現することができる。(2) A fail-safe optical transmission/reception system using feedback control can be implemented without disconnecting communication between the station and the subscriber.
(3)光回路は、局側の光送受信回路を一枚の基板上に
先導波路構造で構成することできるので、量産が可能で
あり大幅な低コスト化を期待できる。(3) In the optical circuit, since the optical transmitter/receiver circuit on the central office side can be constructed with a leading waveguide structure on a single substrate, mass production is possible and a significant cost reduction can be expected.
第1図は本発明のフェールセーフ型光送受信方式の実施
例を示す図、第2図は本発明の実施例である局側め光送
受信部の光回路の構成図、第3図は従来の光送受信方式
の構成を示した図である。
図中、1a、1bは電気−光変換回路(光送受信回路)
、2a、2bは光合分波回路、3a。
3bは光モニタ回路、4は光スイッチ、5a。
5bは光合分波回路、6a、6bは光ファイバ伝送路、
7は光スイッチ、8は光合分波回路、9は光−電気変換
回路、10は電気−光変換回路、11a、llbは光−
電気変換回路(光送受信回IN)、13は駆動用電圧源
、14はアース電極、23a、23bは光試験回路、1
00は光送受信回路の制御回路を示す。
特許出願人 日立電線株式会社
代理人弁理士 關 谷 信 雄Fig. 1 is a diagram showing an embodiment of the fail-safe optical transceiver system of the present invention, Fig. 2 is a configuration diagram of the optical circuit of the optical transmitter/receiver section on the central side which is an embodiment of the present invention, and Fig. 3 is a diagram showing a conventional optical transceiver system. 1 is a diagram showing the configuration of an optical transmission/reception system. In the figure, 1a and 1b are electrical-optical conversion circuits (optical transceiver circuits)
, 2a, 2b are optical multiplexing/demultiplexing circuits, and 3a. 3b is an optical monitor circuit, 4 is an optical switch, and 5a. 5b is an optical multiplexing/demultiplexing circuit, 6a and 6b are optical fiber transmission lines,
7 is an optical switch, 8 is an optical multiplexing/demultiplexing circuit, 9 is an optical-electrical conversion circuit, 10 is an electrical-optical conversion circuit, and 11a and llb are optical-
Electrical conversion circuit (optical transceiver circuit IN), 13 is a driving voltage source, 14 is a ground electrode, 23a and 23b are optical test circuits, 1
00 indicates a control circuit of the optical transmitter/receiver circuit. Patent applicant: Nobuo Sekitani, Patent Attorney, Hitachi Cable Co., Ltd.
Claims (1)
で接続し、 局側には、主系回路及び予備系回路として、波長λ1及
びλ2の光信号を送出及び受信する光送受信回路、該光
信号を合分波する光合分波回路、光ファイバ伝送路へ波
長λ3の光パルス信号を送出して光ファイバ伝送路の障
害を試験監視する光試験回路を設けると共に、これら主
系及び予備系回路を切り替える光スイッチを設け、 加入者側には、主系及び予備系の光ファイ バ伝送路を切り替える光スイッチ、光合分波回路、波長
λ2及びλ1の光信号を送出及び受信する光送受信回路
を設け、 上記光試験回路により光ファイバ伝送路の 障害が検出されたときは、局側及び加入者側に設けた上
記光スイッチにより、光ファイバ伝送路を主系から予備
系に切り替える ことを特徴とするフェールセーフ型光送受信方式。 2、請求項1記載の光ファイバ伝送路の主系から予備系
への切り替えは、光試験回路の出力を局側の光スイッチ
へフィードバック制御することにより行うことを特徴と
する請求項1記載のフェールセーフ型光送受信方式。 3、請求項1記載の局側に、更に主系及び予備系の光経
路に送出光信号をモニタする光モニタ回路を設け、該光
モニタ回路により主系の光送受信回路の光出力に異常が
検出されたとき、当該光送受信回路を予備系に切り替え
且つ光スイッチも予備系に切り替えることを特徴とする
請求項1記載のフェールセーフ型光送受信方式。 4、請求項3記載の局側における光送受信回路と光スイ
ッチの予備系への切り替えは、上記光モニタ回路の出力
を局側の光スイッチと局側の光送受信回路の制御回路と
にフィードバック制御することにより行うことを特徴と
する請求項3記載のフェールセーフ型光送受信方式。 5、請求項1又は3記載の局側及び加入者側の光回路を
光導波路で構成したことを特徴とするフェールセーフ型
光回路。[Claims] 1. A main system and a protection optical fiber transmission line connect the station and the subscriber, and the station side receives optical signals of wavelengths λ1 and λ2 as the main system circuit and the protection system circuit. An optical transmitting/receiving circuit for transmitting and receiving, an optical multiplexing/demultiplexing circuit for multiplexing and demultiplexing the optical signals, and an optical test circuit for testing and monitoring failures in the optical fiber transmission line by transmitting an optical pulse signal of wavelength λ3 to the optical fiber transmission line. At the same time, an optical switch is installed to switch between the main and protection circuits, and on the subscriber side, there is an optical switch to switch between the main and protection optical fiber transmission lines, an optical multiplexing/demultiplexing circuit, and optical signals with wavelengths λ2 and λ1. An optical transmitter/receiver circuit is installed to send and receive optical fibers, and when a fault in the optical fiber transmission line is detected by the optical test circuit, the optical switch installed on the station side and the subscriber side switches the optical fiber transmission line to the main system. A fail-safe optical transmission/reception system that is characterized by switching from 1 to 2 to a standby system. 2. The switching from the main system to the backup system of the optical fiber transmission line according to claim 1 is performed by feedback control of the output of the optical test circuit to the optical switch at the central office side. Fail-safe optical transmission and reception method. 3. The office side according to claim 1 is further provided with an optical monitor circuit that monitors the transmitted optical signal in the optical path of the main system and the protection system, and the optical monitor circuit detects abnormalities in the optical output of the optical transmitter/receiver circuit of the main system. 2. The fail-safe optical transmitting and receiving system according to claim 1, wherein when the optical transmitting and receiving circuit is detected, the optical transmitting and receiving circuit is switched to a standby system and the optical switch is also switched to a standby system. 4. Switching the optical transmitting/receiving circuit and the optical switch on the central office side to the standby system according to claim 3 is achieved by feedback control of the output of the optical monitor circuit to the optical switch on the central office side and the control circuit of the optical transmitting/receiving circuit on the central office side. 4. The fail-safe optical transmission/reception system according to claim 3, wherein the fail-safe optical transmission/reception system is carried out by: 5. A fail-safe optical circuit, characterized in that the optical circuits on the station side and the subscriber side according to claim 1 or 3 are constituted by optical waveguides.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2195022A JPH0482335A (en) | 1990-07-25 | 1990-07-25 | Fail safe type optical transmission reception system and its optical circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2195022A JPH0482335A (en) | 1990-07-25 | 1990-07-25 | Fail safe type optical transmission reception system and its optical circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0482335A true JPH0482335A (en) | 1992-03-16 |
Family
ID=16334236
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2195022A Pending JPH0482335A (en) | 1990-07-25 | 1990-07-25 | Fail safe type optical transmission reception system and its optical circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0482335A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0646039A (en) * | 1992-07-23 | 1994-02-18 | Nec Corp | Optical fiber medium connector |
-
1990
- 1990-07-25 JP JP2195022A patent/JPH0482335A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0646039A (en) * | 1992-07-23 | 1994-02-18 | Nec Corp | Optical fiber medium connector |
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