JPS6139777B2 - - Google Patents
Info
- Publication number
- JPS6139777B2 JPS6139777B2 JP55084088A JP8408880A JPS6139777B2 JP S6139777 B2 JPS6139777 B2 JP S6139777B2 JP 55084088 A JP55084088 A JP 55084088A JP 8408880 A JP8408880 A JP 8408880A JP S6139777 B2 JPS6139777 B2 JP S6139777B2
- Authority
- JP
- Japan
- Prior art keywords
- optical
- optical fiber
- wavelength
- signal
- loop
- 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
- 239000013307 optical fiber Substances 0.000 claims description 49
- 230000003287 optical effect Effects 0.000 claims description 46
- 230000005540 biological transmission Effects 0.000 claims description 13
- 230000005856 abnormality Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 10
- 230000002457 bidirectional effect Effects 0.000 description 5
- 239000000835 fiber Substances 0.000 description 3
- 230000001010 compromised effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0287—Protection in WDM systems
- H04J14/0289—Optical multiplex section protection
- H04J14/0291—Shared protection at the optical multiplex section (1:1, n:m)
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
- H04J14/0283—WDM ring architectures
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mechanical Light Control Or Optical Switches (AREA)
- Optical Communication System (AREA)
Description
【発明の詳細な説明】
本発明は光ループネツトワークのリンクカツプ
ラとして用いられ、１本の光フアイバにてループ
バツク機能をもつことのできるリンクカツプラに
関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a link coupler that is used as a link coupler in an optical loop network and can have a loop back function with a single optical fiber.
第１図は従来のリンクカツプラの原理を説明す
るブロツク図である。図において１，２は主ルー
プを構成する光フアイバ、３，４は予備ループを
構成する光フアイバ５は光フアイバコネクタ、６
は２：２の光スイツチ、７，８は電気信号を光信
号に変換する電／光変換器、９，１０は光信号を
電気信号に変換する光／電変換器、１１はループ
バツクモードの際に働く電気スイツチ、１２は送
信信号端子、１３は受信信号端子である。 FIG. 1 is a block diagram illustrating the principle of a conventional link coupler. In the figure, 1 and 2 are optical fibers forming a main loop, 3 and 4 are optical fibers forming a backup loop, 5 is an optical fiber connector, and 6 is an optical fiber connector.
is a 2:2 optical switch, 7 and 8 are electrical/optical converters that convert electrical signals to optical signals, 9 and 10 are optical/electrical converters that convert optical signals to electrical signals, and 11 is a loopback mode switch. 12 is a transmitting signal terminal, and 13 is a receiving signal terminal.
先ず、正常時には主ループの光フアイバ１より
入射した光信号はコネクタ５を経て光スイツチ６
を通過し、光／電変換器９により電気信号に変換
され、受信信号端子１３で受信される。又送信端
子１２により送出された電気信号は電／光変換器
７により光信号に変換され、主ループの光フアイ
バ２によつて下流局に送信される。次に、電気ス
イツチ１１はループバツクモードの際に動作する
スイツチで、例えば、図において左側の光フアイ
バ２，３が断線をおこした場合、主ループの光フ
アイバ１により光信号を受信し、前述したように
受信信号１３により受信する。送信側は送信信号
端子１２により送信され、電気スイツチ１１を介
して電／光変換器８により光信号に変換され、予
備ループの光フアイバ４によつて所謂ループバツ
クを行なうループを構成・維持する。また、光ス
イツチ６はバイパスモード時に主ループ及び予備
ループの夫々の入力端子と出力端子どうしを光学
的に接続し、所謂バイパスさせるための光スイツ
チである。 First, during normal operation, the optical signal input from the optical fiber 1 of the main loop passes through the connector 5 and is sent to the optical switch 6.
The signal passes through the optical/electrical converter 9, converts the signal into an electrical signal, and receives the signal at the receiving signal terminal 13. Further, the electrical signal sent out by the transmission terminal 12 is converted into an optical signal by the electrical/optical converter 7, and is transmitted to the downstream station via the optical fiber 2 of the main loop. Next, the electric switch 11 is a switch that operates in the loopback mode, and for example, if the optical fibers 2 and 3 on the left side in the figure are disconnected, the electrical switch 11 receives the optical signal through the optical fiber 1 of the main loop, and The received signal 13 is received as shown in FIG. On the transmitting side, a signal is transmitted from a transmission signal terminal 12, is converted into an optical signal by an electrical/optical converter 8 via an electric switch 11, and is used to construct and maintain a loop for performing so-called loopback using the optical fiber 4 of the backup loop. Further, the optical switch 6 is an optical switch for optically connecting the input terminals and output terminals of the main loop and the backup loop to each other in the bypass mode, so-called bypassing.
第２図は、そのループバツクモードの説明図
で、C1，C2，C3，C4ぁは夫々ステーシヨンに接
続されるリンクカツプラで、L1は主ループの光
フアイバ、L2は予備ループの光フアイバを示
し、リンクカツプラC3とC4の間でで光フアイバ
L1，L2が断した場合を示す。この場合リンクカ
ツプラC3とC4がループバツクモードをとり、ル
ープを構成・維持せしめるものである。 Figure 2 is an explanatory diagram of the loopback mode, where C 1 , C 2 , C 3 , and C 4 are link couplers connected to the station, L 1 is the main loop optical fiber, and L 2 is the main loop optical fiber. The fiber optic in the reserve loop is shown and the fiber optic is connected between link couplers C 3 and C 4 .
This shows the case where L 1 and L 2 are disconnected. In this case, link couplers C3 and C4 are in loopback mode to configure and maintain the loop.
このように、バイパスモードとループバツクモ
ードとはループネツトワーク構成上、ネツトワー
クの信頼性の面から必要な機能であり、殆んどの
システムはこの機能をもつている。然しながら２
本の光フアイバを用いてループバツクモードを構
成するため、光フアイバ価格の問題、光フアイバ
コネクタの数、２：２の光スイツチが２個必要と
することで経済的に問題があつた。 As described above, bypass mode and loopback mode are necessary functions from the viewpoint of network reliability in the configuration of a loop network, and most systems have this function. However, 2
Since the loopback mode is configured using a regular optical fiber, there are economical problems due to the cost of the optical fiber, the number of optical fiber connectors, and the need for two 2:2 optical switches.
本発明はこのような従来の問題点を解決するた
め異なる波長をもつ２つの発光源を用い、波長多
重技術により１本の光フアイバでバイパスモー
ド、ループバツクモードの機能をもたせるように
したものである。以下本発明を図面により詳細に
説明する。 In order to solve these conventional problems, the present invention uses two light emitting sources with different wavelengths, and uses wavelength multiplexing technology to provide bypass mode and loopback mode functions with a single optical fiber. be. The present invention will be explained in detail below with reference to the drawings.
第３図は本発明波長多重リンクカツプラの原理
を説明するブロツク図で、図において、２１，２
２は伝送路としての双方向性の光フアイバ、２３
は光フアイバコネクタ、２４はバイパスモード時
の光スイツテチ、２５は２つの波長λ１とλ２を
双方向で合分波する合分波器を２組もつて合分波
回路、２６，２７は夫々の波長λ１，λ２の光／
電変換器、２８，２９は夫々の波長λ１，λ２の
電／光変換器、３０はループバツクモードで動作
する電気スイツチ、３１は受信信号端子、３２は
送信信号端子である。 FIG. 3 is a block diagram explaining the principle of the wavelength division multiplexing link coupler of the present invention.
2 is a bidirectional optical fiber as a transmission line, 23
24 is an optical fiber connector, 24 is an optical switch in bypass mode, 25 is a multiplexer/demultiplexer circuit with two sets of multiplexer/demultiplexer that bidirectionally multiplexes and demultiplexes two wavelengths λ 1 and λ 2 , 26 and 27 are multiplexer/demultiplexer circuits. Light with respective wavelengths λ 1 and λ 2 /
Electrical converters 28 and 29 are electrical/optical converters for wavelengths λ 1 and λ 2 respectively, 30 is an electric switch operating in loopback mode, 31 is a receiving signal terminal, and 32 is a transmitting signal terminal.
次にその動作を述べる。 Next, its operation will be described.
先ず、正常時には光フアイバ２１より受信した
波長λ１の光信号はコネクタ２３を経て光スイツ
チ２４を通過し、合分波回路２５を介して光／電
変器２６により電気信号に変換され、受信信号端
子３１で受信される。また、送信信号は送信信号
端子３２より送信され、電／光変換器２８の波長
λ１の発光素子により光信号に変換され、合分波
回路２５によつて光フアイバ２２により下流局に
送信される。 First, during normal operation, an optical signal of wavelength λ 1 received from the optical fiber 21 passes through the connector 23 and the optical switch 24, passes through the multiplexing/demultiplexing circuit 25, is converted into an electrical signal by the optical/electrical transformer 26, and is received. The signal is received at the signal terminal 31. Further, the transmission signal is transmitted from the transmission signal terminal 32, converted into an optical signal by the light emitting element of wavelength λ 1 of the electric/optical converter 28, and transmitted to the downstream station via the optical fiber 22 by the multiplexing/demultiplexing circuit 25. Ru.
次に、ループバツクモードでの動作を、光フア
イバ２１が断線したことを例にして説明する。 Next, the operation in the loopback mode will be explained using an example in which the optical fiber 21 is disconnected.
先ず送信側は、正常時と同様送信信号端子３２
より電／光変換器２８における波長λ１の発光素
子により光信号に変換され光フアイバ２２により
下流局に送信される。受信側は下流局より波長λ
２の光信号を受信し、合分波回路２５により光／
電変換器２７に導びかれ、光信号は電気信号に変
換され受信信号端子３１により受信さる。またバ
イパスモードでは２：２の光スイツチ２４により
バイパスモードをとることができる。 First, on the transmitting side, the transmitting signal terminal 32 is connected as in normal operation.
The signal is then converted into an optical signal by a light emitting element with a wavelength λ 1 in the electro/optical converter 28 and transmitted to a downstream station via the optical fiber 22. The receiving side uses the wavelength λ from the downstream station.
2 optical signals are received, and the optical/demultiplexing circuit 25
The optical signal is guided to an electric converter 27, where the optical signal is converted into an electric signal and received by a reception signal terminal 31. Further, in the bypass mode, the 2:2 optical switch 24 can be used to set the bypass mode.
第４図は上記本発明リンクカツプラに基づくル
ープバツクモードの説明図で、C21，C22，C23，
C24は各ステーシヨンに接続される本発明のリン
クカツプラ、Ｌは１本の光フアイバである。図に
示すように、リンクカツプラC23とC24の間の光フ
アイバが断線した場合を示し、リンクカゾプラ
C23，C24が夫々ループバツクモードをとり、ルー
プを構成・維持せしめている。なお、図において
→は波長λ１を〓は波長λ２を示す。 FIG. 4 is an explanatory diagram of the loopback mode based on the link coupler of the present invention, in which C 21 , C 22 , C 23 ,
C 24 is a link coupler of the present invention connected to each station, and L is one optical fiber. As shown in the figure, the optical fiber between Link Cutup Plas C 23 and C 24 is disconnected.
C 23 and C 24 each take a loopback mode to configure and maintain the loop. In the figure, → indicates the wavelength λ 1 and 〓 indicates the wavelength λ 2 .
第５図は本発明波長多重リンクカツプラの一実
施例を示す接続図で、発光素子として波長λ１，
λ２のLEDを、合分波器として誘電体干渉膜フ
イルタを用いている。図において、４１，４２は
伝送路としての双方向性光フアイバ、４３は光フ
アイバコネクタ、４４は光スイツチの役目をする
可動ミラー、４５は長波長帯、例えば波長λ２の
光信号を通過させる干渉膜フイルタ（Iwp）、４
６は短波長帯、例えば波長λ１の光信号を通過さ
せる干渉膜フイルタ（swp）、４７は波長λ１の
光信号を電気信号に変換するホトダイオード、４
８は波長λ２の光信号を電気信号に変換するホト
ダイオード、４９は波長λ２の発光素子
（LED）、５０は波長λ１の発光素子（LED）で
ある。 FIG. 5 is a connection diagram showing an embodiment of the wavelength multiplexing link coupler of the present invention, in which the light emitting elements have wavelengths λ 1 , λ 1 ,
A dielectric interference film filter is used as a multiplexer/demultiplexer for the λ 2 LED. In the figure, 41 and 42 are bidirectional optical fibers as transmission paths, 43 is an optical fiber connector, 44 is a movable mirror that serves as an optical switch, and 45 is a long wavelength band, for example, for passing an optical signal of wavelength λ 2 . Interference membrane filter (Iwp), 4
6 is an interference film filter (SWP) that passes an optical signal in a short wavelength band, for example, wavelength λ 1 ; 47 is a photodiode that converts an optical signal with wavelength λ 1 into an electrical signal; 4
8 is a photodiode that converts an optical signal with wavelength λ 2 into an electrical signal, 49 is a light emitting element (LED) with wavelength λ 2 , and 50 is a light emitting element (LED) with wavelength λ 1 .
次に、その動作を説明する。 Next, its operation will be explained.
先ず、正常時には可動ミラー４４は除去され、
光フアイバ４１により受信した波長λ１の光信号
は、Iwp４５により反射されホトダイオード４７
により電気信号に変換され受信される。一方送信
信号はLED５０により波長Ａλ１の光信号に変
換され、swp４６を通過し、光フアイバ４２によ
り下流局に送信される。 First, during normal operation, the movable mirror 44 is removed,
The optical signal of wavelength λ 1 received by the optical fiber 41 is reflected by the Iwp 45 and sent to the photodiode 47.
is converted into an electrical signal and received. On the other hand, the transmission signal is converted into an optical signal of wavelength Aλ 1 by the LED 50, passes through the SWP 46, and is transmitted to the downstream station via the optical fiber 42.
次に、光フアイバ４１がが断線した場合を例に
してループバツクモード時の動作を説明すると、
送信に関しては正常時と同様LED５０により光
信号は光フアイバ４２により下流局に送信され
る。一方受信では下流局より波長λ２の光信号を
光フアイバ４２より受信し、swp４６により反射
し、ホトダイオード４８により電気信号に変換さ
れ受信される。また、バイパスモード時には可動
ミラー４４が図の位置に固定され、光フアイバ４
１，４２は光学的に接続される。 Next, the operation in loopback mode will be explained using an example where the optical fiber 41 is disconnected.
As for transmission, the optical signal is transmitted by the LED 50 to the downstream station via the optical fiber 42 as in the normal state. On the other hand, in reception, an optical signal of wavelength λ 2 is received from the downstream station through the optical fiber 42, reflected by the SWP 46, converted into an electrical signal by the photodiode 48, and received. In addition, in the bypass mode, the movable mirror 44 is fixed at the position shown in the figure, and the optical fiber 4
1 and 42 are optically connected.
このようにすると従来技術に比べ同じ機能を有
しながら２本の光フアイバを１本に、また光フア
イバコネクタ、光スイツチ等の構成部品の数を減
少させることができる。しかもフアイバ伝送損失
を無視すれば原理的に無損失の伝送が可能であ
り、伝送路からの反射があつてもクロストークを
無視できる高品質なループネツトワークを実現で
きる。更に従来、通常主ループと予備ループの２
芯の光フアイバは１本のケーブルにケーブル化さ
れるため、光フアイバ断の事故では２本の光フア
イバが同時に切断されるのが殆んどであり、従つ
て１本の光フアイバにすることによつて信頼性を
損なうことはない。 In this way, two optical fibers can be reduced to one, and the number of components such as optical fiber connectors and optical switches can be reduced, while maintaining the same functions as in the prior art. Moreover, if fiber transmission loss is ignored, lossless transmission is possible in principle, and a high-quality loop network can be realized in which crosstalk can be ignored even if there is reflection from the transmission path. Furthermore, conventionally, there are usually two loops: a main loop and a backup loop.
Since the core optical fiber is cabled into one cable, in most cases of an optical fiber breakage accident, two optical fibers are cut at the same time, so it is necessary to make one optical fiber. reliability will not be compromised.
以上詳細に説明したように、本発明によれば１
本の光フアイバでバイパス及びループバツク機能
をもつたループネツトワークを構成したから、構
成部品が少なく且つ経済的なネツトワークで構成
することができる大きな効果がある。 As explained in detail above, according to the present invention, 1
Since the loop network with bypass and loop back functions is constructed using optical fibers, there is a great effect that the network can be constructed with fewer components and is economical.
第１図は従来の光リンクカツプラの原理を説明
するブロツク図、第２図は同じくそのループバツ
クモードの説明図、第３図は本発明波長多重リン
クカツプラの原理を説明するブロツク図、第４図
は同じくそのループバツクモードの説明図、第５
図は本発明波長多重リンクカツプラの一実施例を
示す接続図である。
２１，２２…双方向性光フアイバ、２３…光フ
アイバコネクタ、２４…光スイツチ、２５…合分
波回路、２６，２７…光／電変換器、２８，２９
…電／光変換器、３０…電気スイツチ、３１…受
信信号端子、３２…送信信号端子、C21，C22，
C23，C24…リンクカツプラ、Ｌ…双方向性光フア
イバ、４１，４２…双方向性光フアイバ、４３…
光フアイバコネクタ、４４…可動ミラー４５…長
波長帯（λ２）を通過させる干渉膜フイルタ、４
７…短波長帯（Ａλ１）を通過させる干渉膜フイ
ルタ、４７…波長λ１のホトダイオード、４８…
波長λ２のホトダイオード、４９…波長λ２の発
光素子（LED）、５０…波長λ１の発光素子
（LED）。
FIG. 1 is a block diagram explaining the principle of a conventional optical link coupler, FIG. 2 is a diagram explaining the loopback mode thereof, and FIG. 3 is a block diagram explaining the principle of the wavelength division multiplexing link coupler of the present invention. Figure 4 is also an explanatory diagram of the loopback mode, Figure 5
The figure is a connection diagram showing an embodiment of the wavelength division multiplex link coupler of the present invention. 21, 22... Bidirectional optical fiber, 23... Optical fiber connector, 24... Optical switch, 25... Multiplexing/demultiplexing circuit, 26, 27... Optical/electrical converter, 28, 29
...Electronic/optical converter, 30... Electric switch, 31... Reception signal terminal, 32... Transmission signal terminal, C 21 , C 22 ,
C 23 , C 24 ...Link coupler, L...Bidirectional optical fiber, 41, 42...Bidirectional optical fiber, 43...
Optical fiber connector, 44...Movable mirror 45...Interference film filter that passes long wavelength band (λ 2 ), 4
7... Interference film filter that passes short wavelength band (Aλ 1 ), 47... Photodiode with wavelength λ 1 , 48...
Photodiode with wavelength λ 2 , 49...Light emitting element (LED) with wavelength λ 2 , 50... Light emitting element (LED) with wavelength λ 1 .
Claims (1)
常時には１つの波長により光ループネツトワーク
を構成し、光フアイバ断等の異常によりループバ
ツク機構も必要とする場合は波長多重技術により
２つの波長を用い、１本の光フアイバでループネ
ツトワークを構成・維持する波長多重リンクカツ
プラにおいて、いずれかの波長を透過し且つ異な
る波長の受光素子及び発光素子を透過又は反射に
より光フアイバに光学的に接続するフイルタをそ
れぞれの光フアイバに付設すると共に、バイパス
モード時に動作して光フアイバ同士を光学的に接
続する可動ミラーを付設したことを特徴とする波
長リンクカツプラ。1 Two light emitting elements with different wavelengths are used to form an optical loop network using one wavelength under normal conditions, and when a loopback mechanism is required due to an abnormality such as an optical fiber break, two wavelengths are used using wavelength multiplexing technology. In a wavelength multiplex link coupler that configures and maintains a loop network using a single optical fiber, a light-receiving element and a light-emitting element of different wavelengths are optically connected to the optical fiber by transmission or reflection. A wavelength link coupler characterized in that a filter is attached to each optical fiber, and a movable mirror that operates in a bypass mode and optically connects the optical fibers is attached.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8408880A JPS5710103A (en) | 1980-06-23 | 1980-06-23 | Wavelength multiplex link coupler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8408880A JPS5710103A (en) | 1980-06-23 | 1980-06-23 | Wavelength multiplex link coupler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5710103A JPS5710103A (en) | 1982-01-19 |
| JPS6139777B2 true JPS6139777B2 (en) | 1986-09-05 |
Family
ID=13820741
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8408880A Granted JPS5710103A (en) | 1980-06-23 | 1980-06-23 | Wavelength multiplex link coupler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5710103A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63171584U (en) * | 1987-04-28 | 1988-11-08 | ||
| JPH0542194Y2 (en) * | 1988-03-04 | 1993-10-25 | ||
| JPH0628167U (en) * | 1992-09-19 | 1994-04-15 | 株式会社イナックス | Attachment frame attachment structure |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5950633A (en) * | 1982-09-14 | 1984-03-23 | Meidensha Electric Mfg Co Ltd | Loop type data highway system by optical communication |
| JPH0445318Y2 (en) * | 1986-04-24 | 1992-10-26 | ||
| JPH02137427A (en) * | 1988-11-18 | 1990-05-25 | Du Pont Opt Electron Kk | Photoelectric connector and optical receptacle |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5494206A (en) * | 1978-01-10 | 1979-07-25 | Toshiba Corp | Photo transmission system of loop shape |
| JPS5495259A (en) * | 1978-01-11 | 1979-07-27 | Matsushita Electric Ind Co Ltd | Optical communication apparatus |
-
1980
- 1980-06-23 JP JP8408880A patent/JPS5710103A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5494206A (en) * | 1978-01-10 | 1979-07-25 | Toshiba Corp | Photo transmission system of loop shape |
| JPS5495259A (en) * | 1978-01-11 | 1979-07-27 | Matsushita Electric Ind Co Ltd | Optical communication apparatus |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63171584U (en) * | 1987-04-28 | 1988-11-08 | ||
| JPH0542194Y2 (en) * | 1988-03-04 | 1993-10-25 | ||
| JPH0628167U (en) * | 1992-09-19 | 1994-04-15 | 株式会社イナックス | Attachment frame attachment structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5710103A (en) | 1982-01-19 |
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