JPS5857835A - Optical communication system - Google Patents

Optical communication system

Info

Publication number
JPS5857835A
JPS5857835A JP56155946A JP15594681A JPS5857835A JP S5857835 A JPS5857835 A JP S5857835A JP 56155946 A JP56155946 A JP 56155946A JP 15594681 A JP15594681 A JP 15594681A JP S5857835 A JPS5857835 A JP S5857835A
Authority
JP
Japan
Prior art keywords
level
optical
line
transmission line
signal
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.)
Granted
Application number
JP56155946A
Other languages
Japanese (ja)
Other versions
JPS628982B2 (en
Inventor
Kiyoharu Inao
稲生 清春
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.)
Yokogawa Electric Corp
Original Assignee
Yokogawa Electric Corp
Yokogawa Hokushin Electric Corp
Yokogawa Electric Works Ltd
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 Yokogawa Electric Corp, Yokogawa Hokushin Electric Corp, Yokogawa Electric Works Ltd filed Critical Yokogawa Electric Corp
Priority to JP56155946A priority Critical patent/JPS5857835A/en
Publication of JPS5857835A publication Critical patent/JPS5857835A/en
Publication of JPS628982B2 publication Critical patent/JPS628982B2/ja
Granted legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27Arrangements for networking
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27Arrangements for networking
    • H04B10/278Bus-type networks

Abstract

PURPOSE:To make the level of a reception signal from any transmission station equal and to decrease the number of components, by folding the signals at a reflector provided at one end of an optical transmission line and determining a transmission output level of a plurality of stations on the folded line. CONSTITUTION:A signal is folded by providing a reflector A at one end of an optical transmission line 1, transmitters 31-3n of a plurality of communication stations 21-2n are connected to the outgoing direction of the line and receivers 41-4n are connected in the direction of return path via a unidirectional coupler, respectively. The transmission level is adjusted so that the signal level of the transmitters 31-3n at the folding point A can be made equal. Thus, the input level to the receivers 41-4n is kept almost the same, allowing to attain high- speed response. Further, the number of components can be decreased. Moreover, an absorber is provided at another end of the transmission line 1.

Description

【発明の詳細な説明】 本発明は、受動分岐形の光データ・バスを用いた光通信
方式の改良に関するものである。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an optical communication system using a passive branch type optical data bus.

受動分岐形の光データ・バスは、バスに直列に能動素子
を含まないので、高信頼性の光データ・バスが実現じや
すい利点があるが、分岐点(カップラ)において光信号
の損失を生じるので、受信信号のレベルは受信点と送信
点の間に存在するカップラの数によって変化する。この
ため、複数の局をこの種の光データ・バスで結んでなる
光通信システムにおいては、受信信号のレベルは、その
信号がどの局からきたものかによって大きく変化する。
Passive branch type optical data buses do not include active elements in series with the bus, so they have the advantage of making it easier to realize highly reliable optical data buses, but optical signal loss occurs at the branch point (coupler). Therefore, the level of the received signal changes depending on the number of couplers existing between the receiving point and the transmitting point. Therefore, in an optical communication system in which a plurality of stations are connected by this type of optical data bus, the level of a received signal varies greatly depending on which station the signal comes from.

送信レベルの変化には受信感度を自動調節して対処する
が、感度調節の応答速度の面から通信の速度が制限され
、高速通信は困難である。
Changes in transmission level are dealt with by automatically adjusting reception sensitivity, but communication speed is limited by the response speed of sensitivity adjustment, making high-speed communication difficult.

光データ・バス上に光信号を双方向に流通させようとす
ると、単方向性の光カップラを方向を逆にして2つ用い
るか、特別な構造の双方向性光カップラを用いなければ
ならない。しかし、単方向性光カップラを2つ用いると
送受信器が2組必要罠なって部品点数が増加し、また双
方向性光カップラは光学的精度の厳密なものが要求され
、しかも一般に光の損失が大きい。
If an optical signal is to be passed bidirectionally on an optical data bus, it is necessary to use two unidirectional optical couplers with their directions reversed, or to use a bidirectional optical coupler with a special structure. However, if two unidirectional optical couplers are used, two sets of transmitters and receivers are required, increasing the number of parts, and bidirectional optical couplers require strict optical precision and generally suffer from optical loss. is large.

本発明の目的は、受信信号のレベルがどの送信局からの
ものも同一であり、かつ部品点数の少ない光通信方式を
提供することKある。
SUMMARY OF THE INVENTION An object of the present invention is to provide an optical communication system in which the level of a received signal is the same from any transmitting station and has a small number of parts.

本発明は、光伝送線路の一端に反射器を設けて信号を折
返えすことKより往復線路とし、この伝送線路の往畔の
方向に複数の局の各送信器をそれぞれ単方向カップラを
介して接続し、復路の方向に各局の各受信器をそれぞれ
単方向カップラを介して接続するとともに、各局から送
信された信号のレベルが伝送線路の折返し点においてす
べて等しくなるように、各局の送信出力レベルを定めた
ものである。
In the present invention, a reflector is provided at one end of the optical transmission line to return the signal, thereby creating a round trip line, and each transmitter of a plurality of stations is connected in the direction of the transmission line via a unidirectional coupler. In addition, each receiver of each station is connected via a unidirectional coupler in the return direction, and the transmission output level of each station is adjusted so that the level of the signal transmitted from each station is equal at the turning point of the transmission line. It has been established that

以下、図面によって本発明の詳細な説明する。Hereinafter, the present invention will be explained in detail with reference to the drawings.

第1図は、本発明実施例の概念的構成図である。FIG. 1 is a conceptual block diagram of an embodiment of the present invention.

第1図において、1は光伝送#j15.21 e 22
 + −、−2nは通信局3□、 32. 、、、3n
は各通信局にお、ける送信器、41゜4210.−4n
は通信局における受信器である。
In Figure 1, 1 is optical transmission #j15.21 e 22
+ -, -2n are communication stations 3□, 32. ,,,3n
is the transmitter at each communication station, 41°4210. -4n
is the receiver at the communication station.

光伝送線路1は、一端に設けられた反射器Aで通信を折
返すことにより往復線路とされ、往路の方向には、各通
信局21(1■1〜n)の送信器31が、それぞれ単方
向の受動分岐からなるカップラを介して接続され、復路
の方向には、各通信局21の受信器41がそれぞれ同様
なカップラを介して接続される。光伝送II!!路1の
他端には吸収器Bが設けられる。各送信器31のカップ
ラは、すべて同一の向きとされ、それらに合わせて、受
信器410カツプラの向きもすべて同一とされる。すな
わち、各送信器31の出力信号は、すべて、光伝送Ii
l銘1の反射器^で反射されて各受信器41に伝送され
る構造、 とされる。なお、送信器31と受信器41は
共通のカップラに第2図のように接続してもよい。
The optical transmission line 1 is made into a round trip line by returning the communication at a reflector A provided at one end, and in the direction of the outward path, the transmitters 31 of each communication station 21 (1■1 to n) are connected to each other. They are connected via a coupler consisting of a unidirectional passive branch, and in the return direction, the receivers 41 of each communication station 21 are connected via similar couplers. Optical transmission II! ! At the other end of path 1 an absorber B is provided. The couplers of each transmitter 31 are all oriented in the same direction, and accordingly, the couplers of the receiver 410 are all oriented in the same direction. That is, all the output signals of each transmitter 31 are optically transmitted Ii
The structure is such that the signal is reflected by the reflector 1 and transmitted to each receiver 41. Note that the transmitter 31 and receiver 41 may be connected to a common coupler as shown in FIG.

ここで、反射器Aにおいては、どの送信器31からの信
号もレベルが等しくなるように、各送信器31の信号送
出レベルがそれぞれ設定される。このようにすることに
より、反射善人から各受信器41に伝達される信号のレ
ベルは、反射器Aから各便信器41までの距離および間
に介在する分岐数によって個々に異なるものの、送信器
31による差は生じない・したがって、受信器41の感
度はどの送信器31に対しても一様でよく、もし、自動
感度調節が必要だとしても、わずがなレベルのバラツキ
を補償する柵度でよいので、高速の通信に適する。
Here, in the reflector A, the signal transmission level of each transmitter 31 is set so that the signals from all transmitters 31 have the same level. By doing this, the level of the signal transmitted from the reflector A to each receiver 41 varies depending on the distance from the reflector A to each toilet 41 and the number of branches interposed therebetween, but the level of the signal transmitted from the transmitter 31. Therefore, the sensitivity of the receiver 41 may be uniform for any transmitter 31, and even if automatic sensitivity adjustment is required, there is a fence that compensates for slight level variations. degree, so it is suitable for high-speed communication.

光伝送線路1Fi反射器Aの利用により双方向の伝送線
路となるので、すべての通信局は送信出力を右側の局に
も左側の局にも伝えることができる。
Since the optical transmission line 1Fi becomes a bidirectional transmission line by using the reflector A, all communication stations can transmit their transmission power to both the right station and the left station.

したがって、送信器と受信器のカップラは単方向のもの
を1組しか用いなくても、双方向通信が行える。すなわ
ち、部品点数の少ない双方向光データ・パスが実現でき
る。
Therefore, bidirectional communication is possible even if only one set of unidirectional couplers is used for the transmitter and receiver. In other words, a bidirectional optical data path with a small number of parts can be realized.

以上のように、本発明は、光伝送線路の一端に反射器全
般けて信号を折返光するととKよシ往復線路とし、この
伝送線路の往路の方向に複数の局の各送信器をそれぞれ
単方向力、プラを介して接続し、復路の方向に各局の各
受信器をそれぞれ単方向カップラを介して接続するとと
もに1各周から送信された信号のレベルが伝送線路の折
返し点においてすべて等しくなるように1各局の送信出
力レベルを定めたものである。
As described above, the present invention uses reflectors at one end of an optical transmission line to return signals, forming a round-trip line along K, and transmitting transmitters of a plurality of stations in the direction of the outward path of this transmission line. In the return path, each receiver of each station is connected via a unidirectional coupler, and the level of the signal transmitted from each round is equal at the turning point of the transmission line. The transmission output level of each station is determined so that

このため、本発明によれば、受信信号のレベルがどの送
信局からのものも同一であシ、かつ部品点数の少ない通
信方式が実現できる。
Therefore, according to the present invention, it is possible to realize a communication system in which the level of the received signal is the same regardless of the transmitting station, and the number of parts is small.

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

第1図は、本発明実施例の概念的構成図、第2図は、第
1図の一部の変形例である。 1・・・光伝送線路、21〜2n・・・通信局、31〜
3n・・・送信器、4□〜4n・・・受信器、A・・・
反射器、B・・・吸収器。
FIG. 1 is a conceptual block diagram of an embodiment of the present invention, and FIG. 2 is a partial modification of FIG. 1. 1... Optical transmission line, 21~2n... Communication station, 31~
3n...Transmitter, 4□~4n...Receiver, A...
Reflector, B... absorber.

Claims (1)

【特許請求の範囲】[Claims] 一端において反射による光信号の折返しが行われる光伝
送線路、および、この線路の折返し部が存在する方向に
向きを合わせて結合された受動分岐を通じて接続され折
返し部における信号のレベルが複数の通信局間に共通な
一定値になるように出力レベルが設定された光信号送信
器と、線路の折返し部が存在する方向に向きを合わせて
結合された受動分岐を通じて接続された光信号受信器と
を持つ複数の通信局を具備する光通信方式。
An optical transmission line in which an optical signal is folded back by reflection at one end, and a passive branch connected to the line in the direction in which the folded part is located, and the level of the signal at the folded part is connected to multiple communication stations. An optical signal transmitter whose output level is set to a common constant value between the optical signal transmitter and an optical signal receiver connected through a passive branch that is oriented in the direction in which the line turns exist. Optical communication system with multiple communication stations.
JP56155946A 1981-09-30 1981-09-30 Optical communication system Granted JPS5857835A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56155946A JPS5857835A (en) 1981-09-30 1981-09-30 Optical communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56155946A JPS5857835A (en) 1981-09-30 1981-09-30 Optical communication system

Publications (2)

Publication Number Publication Date
JPS5857835A true JPS5857835A (en) 1983-04-06
JPS628982B2 JPS628982B2 (en) 1987-02-25

Family

ID=15616974

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56155946A Granted JPS5857835A (en) 1981-09-30 1981-09-30 Optical communication system

Country Status (1)

Country Link
JP (1) JPS5857835A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60168203A (en) * 1984-02-10 1985-08-31 Mitsubishi Electric Corp Numerical control device
JPS62248184A (en) * 1987-03-26 1987-10-29 Sony Corp Tape cassette
JPS6322677U (en) * 1986-07-23 1988-02-15
JPH02122740A (en) * 1988-10-31 1990-05-10 Fujikura Ltd Optical bus and network
US5046137A (en) * 1989-01-27 1991-09-03 Matsushita Electric Industrial Co., Ltd. Optical communication system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60168203A (en) * 1984-02-10 1985-08-31 Mitsubishi Electric Corp Numerical control device
JPS6322677U (en) * 1986-07-23 1988-02-15
JPH056617Y2 (en) * 1986-07-23 1993-02-19
JPS62248184A (en) * 1987-03-26 1987-10-29 Sony Corp Tape cassette
JPH02122740A (en) * 1988-10-31 1990-05-10 Fujikura Ltd Optical bus and network
US5046137A (en) * 1989-01-27 1991-09-03 Matsushita Electric Industrial Co., Ltd. Optical communication system

Also Published As

Publication number Publication date
JPS628982B2 (en) 1987-02-25

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