JPH0124455B2 - - Google Patents
Info
- Publication number
- JPH0124455B2 JPH0124455B2 JP57082873A JP8287382A JPH0124455B2 JP H0124455 B2 JPH0124455 B2 JP H0124455B2 JP 57082873 A JP57082873 A JP 57082873A JP 8287382 A JP8287382 A JP 8287382A JP H0124455 B2 JPH0124455 B2 JP H0124455B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- optical
- station
- code
- received
- 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
- 230000003287 optical effect Effects 0.000 claims description 47
- 230000005540 biological transmission Effects 0.000 claims description 41
- 230000002457 bidirectional effect Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 5
- 230000005856 abnormality Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
- H04L25/4906—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using binary codes
- H04L25/4908—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using binary codes using mBnB codes
- H04L25/491—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using binary codes using mBnB codes using 1B2B codes
- H04L25/4912—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using binary codes using mBnB codes using 1B2B codes using CMI or 2-HDB-3 code
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Bidirectional Digital Transmission (AREA)
- Dc Digital Transmission (AREA)
- Optical Communication System (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、異なる波長により双方向の光伝送を
行う双方向性波長多重方式による光伝送方式に関
する。特に、相手局の動作の監視が可能な送信信
号および受信信号の符号の構成に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical transmission system using a bidirectional wavelength multiplexing system that performs bidirectional optical transmission using different wavelengths. In particular, it relates to the structure of codes of transmitted signals and received signals that enable monitoring of the operation of a partner station.
一般に、この種の光伝送方式には第１図に示す
ような光伝送系が用いられている。自局１と相手
局２とは光伝送路３とで接続され、この光伝送路
３を受信信号と送信信号とが異なる波長の光信号
によりデータの送受を行う。この自局１と相手局
２とは電気光変換部５、受信信号と送信信号とで
異なつている波長の光を分波する光フイルタ６、
光電気変換部７および誤検出回路８とでそれぞれ
構成されている。
Generally, an optical transmission system as shown in FIG. 1 is used in this type of optical transmission system. The own station 1 and the other station 2 are connected by an optical transmission line 3, and data is transmitted and received through the optical transmission line 3 using optical signals having different wavelengths for a received signal and a transmitted signal. The own station 1 and the other station 2 include an electro-optic converter 5, an optical filter 6 that separates light of different wavelengths between the received signal and the transmitted signal,
Each of them is composed of a photoelectric conversion section 7 and an erroneous detection circuit 8.
第２図は、この種の光伝送方式に使用される
CMI符号の説明図である。すなわち、CMI符号
は情報が「１」のときには「11」、「00」の交番を
繰返し、情報「０」ときには「01」（あるいは
「10」）の符号を用いる。 Figure 2 shows the type of optical transmission system used for this type of optical transmission system.
FIG. 2 is an explanatory diagram of CMI codes. That is, the CMI code repeats alternations of "11" and "00" when the information is "1", and uses a code of "01" (or "10") when the information is "0".
いま、自局１からの送信信号Ｂは電気光変換部
５により光信号に変換され光フイルタ６を通つて
光伝送路３に送信される。また、相手局２から光
伝送路３に送出された送信信号Ｃは送信信号Ｂに
使用される波長とは異なる波長の光信号で伝送さ
れ光フイルタ６で分波された後、光電気変換部７
で電気信号に変換され増幅されて受信信号Ａとな
る。 Now, the transmission signal B from the own station 1 is converted into an optical signal by the electro-optical converter 5 and transmitted to the optical transmission line 3 through the optical filter 6. Furthermore, the transmission signal C sent from the partner station 2 to the optical transmission line 3 is transmitted as an optical signal with a wavelength different from the wavelength used for the transmission signal B, and after being demultiplexed by the optical filter 6, the transmission signal C is sent to the optical transmission line 3. 7
The received signal A is converted into an electrical signal and amplified.
このとき誤検出回路８は、受信信号の情報
「０」を示すCMI符号「01」を監視し、「01」が
検出されているときには正常動作が行われている
と判断される。このの状態で相手局２に異常が生
じ相手局２からの送信信号Ｃが断となると、自局
１からの送信信号Ｂが光フイルタ６を通つて漏洩
し自局１の光電気変換部７に入力する。このた
め、従来方式では誤検出回路８は相手局２の送信
信号Ｃの断時には、この自局１から送信する光信
号が漏洩した漏洩信号が増幅された信号を監視す
ることになる。すなわち送信信号であるCMI符
号「01」を検出して誤検出を行う。このため、相
手局からの信号を受信しなくても相手局の信号入
力断を検出できない欠点を有する。
At this time, the error detection circuit 8 monitors the CMI code "01" indicating information "0" of the received signal, and when "01" is detected, it is determined that normal operation is being performed. In this state, when an abnormality occurs in the other station 2 and the transmission signal C from the other station 2 is cut off, the transmission signal B from the own station 1 leaks through the optical filter 6 and the optical-electrical converter 7 of the own station 1 Enter. Therefore, in the conventional system, when the transmission signal C of the other station 2 is cut off, the error detection circuit 8 monitors the amplified leakage signal of the optical signal transmitted from the own station 1. In other words, the CMI code "01" which is the transmission signal is detected and an erroneous detection is performed. For this reason, it has the disadvantage that it is not possible to detect a loss of signal input from the partner station without receiving a signal from the partner station.
本発明はこの点を改良するもので、相手局に異
常が生じ光入力が断となつたとき、これを正確に
検出することができる光伝送方式を提供すること
を目的とする。 The present invention improves on this point, and aims to provide an optical transmission system that can accurately detect when an abnormality occurs in the other station and the optical input is cut off.
本発明は、異なる波長の光信号により双方向に
データ送受を行う光伝送路に二つの局が接続さ
れ、上記二つの局は複数の通過波長帯域を持つ光
フイルタを介して上記光伝送路に接続された双方
向性波長多重の光伝送方式において、
上記光伝送路を伝送される符号方式がCMI符
号方式であり、送信符号および受信符号の極性が
互いに反転した符号によりデータの送受を行い、
受信側で受信すべき極性とは異なる符号を検出し
たときに相手局が障害状態であることを出力する
ことを特徴とする。
In the present invention, two stations are connected to an optical transmission line that bidirectionally transmits and receives data using optical signals of different wavelengths, and the two stations are connected to the optical transmission line via an optical filter having a plurality of wavelength bands. In the connected bidirectional wavelength division multiplexing optical transmission system, the coding system transmitted through the optical transmission path is the CMI coding system, and data is sent and received using codes in which the polarity of the transmission code and the reception code are reversed.
It is characterized in that when the receiving side detects a code with a polarity different from that to be received, it outputs that the other station is in a failure state.
本発明では同一の光伝送路上を送信信号と受信
信号とが異なる波長の光信号を使用してデータの
送受信を行つている。本発明では、この光信号の
符号化においてCMI符号を用い、送信符号と受
信符号との極性を相互に反転させた符号によりデ
ータの送受を行う。
In the present invention, data is transmitted and received on the same optical transmission path using optical signals of different wavelengths for a transmission signal and a reception signal. In the present invention, a CMI code is used to encode this optical signal, and data is transmitted and received using a code in which the polarity of a transmission code and a reception code are mutually inverted.
相手局に異常が生じて、光信号を受信しなくな
り、自局からの送信信号が漏洩してこの送信符号
を検出すると、受信すべき信号とはその極性が異
なるため、自局からの送信信号の漏洩信号である
ことが判別でき相手局の異常を検出できる。 If an abnormality occurs in the other station and it no longer receives optical signals, the transmitted signal from the own station leaks and this transmission code is detected, the polarity is different from the signal that should be received, so the transmitted signal from the own station is It can be determined that this is a leaked signal, and an abnormality in the other station can be detected.
本発明の一実施例を図面に基づいて説明する。 An embodiment of the present invention will be described based on the drawings.
第３図は、本発明一実施例の送信信号波形およ
び受信信号波形を示す図である。第３図はCMI
符号の場合を示し、同図ａは送信信号波形、同図
ｂは受信信号波形をそれぞれ示す。この送受信信
号の極性は互いに反転されている。 FIG. 3 is a diagram showing a transmitted signal waveform and a received signal waveform according to an embodiment of the present invention. Figure 3 shows CMI
The case of a code is shown, and FIG. 3A shows the transmitted signal waveform, and FIG. 2B shows the received signal waveform. The polarities of the transmitted and received signals are reversed.
いま、自局１の誤検出回路８は受信信号の情報
「０」を示すCMI符号「10」の反極性「01」を検
出したとき警報信号を送信するように構成され、
相手局２の誤検出回路８は受信信号の情報「０」
を示すCMI符号「01」の反極性「10」を検出し
たとき警報信号を送出するように構成されてい
る。 Now, the false detection circuit 8 of the own station 1 is configured to transmit an alarm signal when it detects the opposite polarity "01" of the CMI code "10" indicating the information "0" of the received signal,
The false detection circuit 8 of the partner station 2 detects the received signal information as “0”.
It is configured to send out an alarm signal when it detects the opposite polarity ``10'' of the CMI code ``01'' indicating .
いま、相手局２の電気光変換部５に障害を生
じ、相手局２からの送信信号Ｃ（第３図ｂ）が断
となると、上記のように自局１からの送信信号Ｂ
（第３図ａ）の光信号が光電気変換部７に漏洩す
る。この漏洩信号は相手局２からの受信信号を受
信しないため、受信信号を増幅する増幅器の
AGC機能によりこの漏洩信号を増幅して誤検出
回路８で誤検出を行う。 Now, if a failure occurs in the electro-optical converter 5 of the other station 2 and the transmission signal C (FIG. 3b) from the other station 2 is cut off, the transmission signal B from the own station 1 will be interrupted as described above.
The optical signal (FIG. 3a) leaks to the photoelectric converter 7. This leaked signal does not receive the received signal from the other station 2, so the amplifier that amplifies the received signal
This leakage signal is amplified by the AGC function and the erroneous detection circuit 8 performs erroneous detection.
しかし、自局１からの送信信号Ｂの情報「０」
を示すCMI符号は「01」であり、誤検出回路８
はCMI符号「01」を検出したとき警報信号を送
出する。したがつて、相手局２からの光入力信号
が断となつたことが直ちに検出される。 However, the information of the transmission signal B from own station 1 is "0"
The CMI code indicating this is “01”, and the false detection circuit 8
sends out an alarm signal when it detects CMI code "01". Therefore, the interruption of the optical input signal from the other station 2 is immediately detected.
なお、相手局２が正常に動作しているときも、
光フイルタ６からは自局１からの送信信号の光信
号が光電気変換部７に漏洩して雑音として検出さ
れるが、この漏洩信号は、受信光信号に比べてレ
ベルの小さい信号であり、増幅器のAGC機能に
よりレベルの大きい受信信号に相応する増幅を行
うため、この漏洩信号に対する増幅度は小さく、
この漏洩信号に対して誤検出回路８が符号の誤検
出を行うことはない。 Note that even when partner station 2 is operating normally,
The optical signal of the transmission signal from the own station 1 leaks from the optical filter 6 to the opto-electric converter 7 and is detected as noise, but this leaked signal is a signal with a lower level than the received optical signal, Since the AGC function of the amplifier performs amplification corresponding to the received signal with a high level, the degree of amplification for this leakage signal is small.
The erroneous detection circuit 8 will not perform erroneous code detection on this leaked signal.
以上説明したように本発明によれば、送信符号
と受信符号の極性が反転した符号を用いているた
め、光入力信号断となつた場合を正確に検出する
ことができ、しかも装置も複雑とならない等の効
果がある。
As explained above, according to the present invention, since the transmitting code and the receiving code use codes in which the polarities are reversed, it is possible to accurately detect the case where the optical input signal is disconnected, and the device is not complicated. There are effects such as:
第１図は光伝送系の一般的な要部ブロツク構成
図。第２図はCMI符号の説明図。第３図は本発
明一実施例の送信符号および受信信号の波形図。
１……自局、２……相手局、３……光伝送路、
５……電気変換部、６……光フイルタ、７……光
電気変換部、８……誤検出回路。
FIG. 1 is a general block diagram of main parts of an optical transmission system. Figure 2 is an explanatory diagram of CMI codes. FIG. 3 is a waveform diagram of a transmission code and a reception signal according to an embodiment of the present invention. 1... Own station, 2... Other station, 3... Optical transmission line,
5...Electrical conversion unit, 6...Optical filter, 7...Optoelectric conversion unit, 8...Error detection circuit.
Claims (1)
受を行う光伝送路に二つの局が接続され、 上記二つの局は複数の通過波長帯域を持つ光フ
イルタを介して上記光伝送路に接続された 双方向性波長多重の光伝送方式において、 上記光伝送路を伝送される符号方式がCMI符
号方式であり、 送信符号および受信符号の極性が互いに反転し
た符号によりデータの送受を行い、 受信側で受信すべき極性とは異なる符号を検出
したときに相手局が障害状態であることを出力す
る ことを特徴とする光伝送方式。[Claims] 1. Two stations are connected to an optical transmission line that bidirectionally transmits and receives data using optical signals of different wavelengths, and the two stations transmit the optical signal through an optical filter having a plurality of passing wavelength bands. In a bidirectional wavelength division multiplexing optical transmission system connected to a transmission line, the encoding system transmitted through the optical transmission line is the CMI encoding system, and data is sent and received using codes in which the polarities of the transmitting code and receiving code are reversed. An optical transmission system characterized by outputting a message indicating that the other station is in a fault state when the receiving side detects a code with a polarity different from the polarity that should be received.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57082873A JPS58198936A (en) | 1982-05-17 | 1982-05-17 | Optical transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57082873A JPS58198936A (en) | 1982-05-17 | 1982-05-17 | Optical transmission system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58198936A JPS58198936A (en) | 1983-11-19 |
| JPH0124455B2 true JPH0124455B2 (en) | 1989-05-11 |
Family
ID=13786410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57082873A Granted JPS58198936A (en) | 1982-05-17 | 1982-05-17 | Optical transmission system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58198936A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60191542A (en) * | 1984-03-13 | 1985-09-30 | Matsushita Electric Ind Co Ltd | Transmitter of infrared ray air propagation data |
| JPS60214661A (en) * | 1984-04-11 | 1985-10-26 | Fujitsu Ltd | Detecting circuit for input absence signal |
-
1982
- 1982-05-17 JP JP57082873A patent/JPS58198936A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58198936A (en) | 1983-11-19 |
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