JPS6211537B2 - - Google Patents
Info
- Publication number
- JPS6211537B2 JPS6211537B2 JP56211809A JP21180981A JPS6211537B2 JP S6211537 B2 JPS6211537 B2 JP S6211537B2 JP 56211809 A JP56211809 A JP 56211809A JP 21180981 A JP21180981 A JP 21180981A JP S6211537 B2 JPS6211537 B2 JP S6211537B2
- Authority
- JP
- Japan
- Prior art keywords
- optical
- transmission line
- beam splitter
- communication station
- optical path
- 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 51
- 230000005540 biological transmission Effects 0.000 claims description 43
- 230000006854 communication Effects 0.000 claims description 30
- 230000002457 bidirectional effect Effects 0.000 claims description 9
- 230000001172 regenerating effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 230000008054 signal transmission Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000007175 bidirectional communication Effects 0.000 description 1
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
- H04B10/27—Arrangements for networking
- H04B10/278—Bus-type networks
Landscapes
- Engineering & Computer Science (AREA)
- Computing Systems (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Bidirectional Digital Transmission (AREA)
- Small-Scale Networks (AREA)
- Optical Communication System (AREA)
Description
【発明の詳細な説明】
本発明は、双方向性のマルチドロツプ形光デー
タ・バスの改良に関するものである。さらに詳し
くは、双方向性のマルチドロツプ形光データ・バ
スの低損失化と高信頼化に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention is an improvement to a bidirectional, multidrop optical data bus. More specifically, the present invention relates to reducing loss and increasing reliability of a bidirectional multi-drop optical data bus.
マルチドロツプ形の光データ・バスは、それに
接続される通信ステーシヨンのどれが機能を停止
しても全通信がとだえない利点がある。また、こ
の形の光データ・バスを双方向性にすると、光伝
送線をループにしないでよい利点もある。 A multi-drop optical data bus has the advantage that all communication will not be interrupted even if any of the communication stations connected to it stop functioning. Furthermore, making this type of optical data bus bidirectional has the advantage that the optical transmission line does not need to be looped.
双方向性のマルチドロツプ形の光データ・バス
の従来例としては、光伝送線を１本用い、それ
に、各通信ステーシヨンを互いに方向の逆な２つ
の光カツプラを通じて接続するようにしたもの
と、光伝送線を２本用い、それら伝送線の一端同
志を再生増幅器を介して接続し、一方の伝送線に
は、各通信ステーシヨンの送信器を一方向の光カ
ツプラを通じて再生増幅器の方向にむけて接続
し、他方の伝送線には、各通信ステーシヨンの受
信器を一方向の光カツプラを通じて再生増幅器の
方向に向けて接続するようにしたものとがある。 Conventional bidirectional multi-drop optical data buses use one optical transmission line and connect each communication station through two optical couplers in opposite directions; Two transmission lines are used, and one end of the transmission lines is connected through a regenerative amplifier, and the transmitter of each communication station is connected to one transmission line through a unidirectional optical coupler toward the regenerative amplifier. However, the other transmission line is one in which the receivers of each communication station are connected through a one-way optical coupler toward the regenerative amplifier.
伝送線が一本のものは、伝送線上に信号を双方
向性に伝送することができるので、伝送線が途中
で断線しても、断線箇所の両側においては、それ
ぞれの伝送線につながる複数の通信ステーシヨン
間で通信が行える。このため、伝送線の断線に対
してはフエイル・ソフトであり。それだけ信頼性
が高い利点があるが、光カツプラが１つの通信ス
テーシヨンあたり２個用いられるので、光カツプ
ラの挿入損失による光信号の減衰が大きい欠点が
ある。 With a single transmission line, signals can be transmitted bidirectionally on the transmission line, so even if the transmission line breaks midway, there are multiple lines connected to each transmission line on both sides of the breakage point. Communication can be performed between communication stations. Therefore, it is a fail soft against disconnection of the transmission line. Although this has the advantage of high reliability, since two optical couplers are used per communication station, there is a disadvantage that the optical signal is greatly attenuated due to the insertion loss of the optical coupler.
伝送線が２本のものは、伝送線の一方が往路で
他方が復路であつて、光信号は一方向だけに伝送
されるから、どちらかの伝送線が断線すると、全
通信がとだえる欠点がある。とくに再生増幅器の
ような能動素子が伝送線に直列に接続されている
ので、この部分の故障により全通信が停止する危
険性がある。また、この形式のものも、往路と復
路にともに通信ステーシヨンごとの光カツプラが
存在するので、光カツプラの挿入損失による光信
号の減衰が大きい。 In systems with two transmission lines, one transmission line is the outbound path and the other is the return path, and the optical signal is transmitted in only one direction, so if either transmission line breaks, all communication will stop. There are drawbacks. In particular, since active elements such as regenerative amplifiers are connected in series to the transmission line, there is a risk that a failure in this part will stop all communications. Also, in this type of communication, there is an optical coupler for each communication station on both the outbound and return routes, so the attenuation of the optical signal due to the insertion loss of the optical coupler is large.
本発明の目的は、伝送線の断線に対してフエイ
ル・ソフトであり、かつ光カツプラの挿入損失が
少ない双方向性のマルチドロツプ形データ・バス
を提供することにある。 SUMMARY OF THE INVENTION An object of the present invention is to provide a bidirectional multi-drop data bus that is fail-proof against transmission line disconnections and has low optical coupler insertion loss.
この目的を達成するために、本発明は、光信号
の伝送線を２本並行して設け、これら両伝送線に
各通信ステーシヨンごとにビーム・スプリツタを
それぞれもうけ、一方の伝送線のビーム・スプリ
ツタには各通信ステーシヨンの受信器をそれぞれ
接続し、他方の伝送線のビーム・スプリツタには
各通信ステーシヨンの送信器をそれぞれ接続し、
かつ、両伝送線上のビーム・スプリツタは、同一
通信ステーシヨンのもの同志で光信号の伝達を行
うようにしたものである。 In order to achieve this object, the present invention provides two optical signal transmission lines in parallel, a beam splitter for each communication station on both transmission lines, and a beam splitter for one transmission line. to which the receiver of each communication station is connected, and the transmitter of each communication station is connected to the beam splitter of the other transmission line, respectively.
In addition, the beam splitters on both transmission lines are configured to transmit optical signals between the beam splitters of the same communication station.
以下、図面によつて本発明を詳細に説明する。
第１図は、本発明実施例の概念的構成図である。
第１図において、１および２は並行して布設され
た光信号用の伝送線、３１−３ｎは通信ステーシ
ヨン、３１１−３ｎ１はそれぞれ通信ステーシヨ
ン３１−３ｎの受信器、３１２−３ｎ２はそれぞ
れ通信ステーシヨン３１−３ｎの送信器、４１１
−４ｎ１および４１２−４ｎ２は通信ステーシヨ
ン３１−３ｎごとに設けられた光用のビーム・ス
プリツタである。 Hereinafter, the present invention will be explained in detail with reference to the drawings.
FIG. 1 is a conceptual block diagram of an embodiment of the present invention.
In FIG. 1, 1 and 2 are transmission lines for optical signals laid in parallel, 31-3n is a communication station, 311-3n1 is a receiver of each communication station 31-3n, and 312-3n2 is a communication station, respectively. 31-3n transmitter, 411
-4n1 and 412-4n2 are optical beam splitters provided for each communication station 31-3n.
ビーム・スプリツタ４ij（ｉ＝１…………ｎ、
ｊ＝1or2）は、２つの光路の光をそれぞれ分割し
て、互いに相手の光路に挿入する機能を有するも
のであり、例えば第２図のように、ハーフ・ミラ
ー４０の両面から２つの光を対照的に照射して、
ともに透過光と反射光に分割し、お互いの透過光
にお互いの反射光を混入するようにしたもので実
現できる。勿論ビーム・スプリツタの構成はこれ
に限定されるものではない。 Beam splitter 4ij (i=1…………n,
j = 1 or 2) has the function of dividing the lights of two optical paths and inserting them into each other's optical path. For example, as shown in Fig. 2, two lights are split from both sides of the half mirror 40. Irradiate in contrast,
This can be achieved by dividing both into transmitted light and reflected light, and mixing each other's reflected light into each other's transmitted light. Of course, the configuration of the beam splitter is not limited to this.
同一の通信ステーシヨン３ｉに属するビーム・
スプリツタ４ｉ１，４ｉ２は、一方の光路（仮に
縦光路と呼ぶ）同志が直列に接続され、他方の光
路（仮りに横光路とよぶ）がそれぞれ伝送線１お
よび２に直列に接続される。ビーム・スプリツタ
４ｉ１の縦光路の一端には受信器３ｉ１が接続さ
れ、ビーム・スプリツタ４ｉ２の一端には送信器
３ｉ２が接続される。送信器３ｉ２から出力され
た光信号は、縦光路を通じて受信機３ｉ１に入力
されるとともに、ビーム・スプリツタ４ｉ１およ
び４ｉ２をつうじてそれぞれ伝送線１および２に
分岐送出される。伝送線１と２の信号伝送方向は
互いに逆になつている。伝送線１の右側から到来
する光信号は、ビーム・スプリツタ４ｉ１におい
て、その横光路を通じて下流に伝送されるととも
に、縦光路に分岐して受信機３ｉ１に入力され
る。伝送線２の左線から到来する光信号は、ビー
ム・スプリツタ４ｉ２において、その横光路をつ
うじて下流に伝送されるとともに、縦光路に分岐
して、ビーム・スプリツタ４ｉ１に達し、そこに
おいて受信器３ｉ１への入力信号と伝送線１の下
流への伝送信号に分割される。 Beams belonging to the same communication station 3i
In the splitters 4i1 and 4i2, one optical path (tentatively referred to as a vertical optical path) is connected in series, and the other optical path (tentatively referred to as a horizontal optical path) is connected in series to the transmission lines 1 and 2, respectively. A receiver 3i1 is connected to one end of the longitudinal optical path of the beam splitter 4i1, and a transmitter 3i2 is connected to one end of the beam splitter 4i2. The optical signal output from the transmitter 3i2 is input to the receiver 3i1 through a vertical optical path, and is branched and sent out to transmission lines 1 and 2 through beam splitters 4i1 and 4i2, respectively. The signal transmission directions of transmission lines 1 and 2 are opposite to each other. An optical signal arriving from the right side of the transmission line 1 is transmitted downstream through the horizontal optical path at the beam splitter 4i1, and is split into a vertical optical path and input to the receiver 3i1. The optical signal arriving from the left line of the transmission line 2 is transmitted downstream through the horizontal optical path at the beam splitter 4i2, and is split into a vertical optical path to reach the beam splitter 4i1, where it is transmitted to the receiver. 3i1 and a transmission signal downstream of transmission line 1.
このような構成であるから、送信器３ｉ２の送
信出力は、ビームスプリツタ４ｉ２で分岐されて
伝送線２を右方向に伝送されるとともに、ビーム
スプリツタ４ｉ２を透過し、４ｉ１で分岐して、
伝送線１を左方向に伝送される。すなわち、ステ
ーシヨン３ｉの送信出力は、右側と左側に同時に
送出され、双方向性の送信が行われることにな
る。また、受信器３ｉ１の入力信号は、伝送線１
の右側からビーム・スプリツタ４ｉ１で分岐して
入力するものと、伝送線２の左側から、ビーム・
スプリツタ４ｉ２で分岐し、４ｉ１を透過して入
力するものと、双方向の入力がある。すなわち、
入力は右からも左からも受信でき、双方向性の入
力信号を受信できる。 With such a configuration, the transmission output of the transmitter 3i2 is split at the beam splitter 4i2 and transmitted to the right on the transmission line 2, transmitted through the beam splitter 4i2, and branched at 4i1.
The signal is transmitted to the left on transmission line 1. That is, the transmission output of the station 3i is simultaneously sent to the right and left sides, resulting in bidirectional transmission. Moreover, the input signal of the receiver 3i1 is the transmission line 1
The beam splitter 4i1 splits and inputs the beam from the right side of the transmission line 2, and the beam splits from the left side of the transmission line 2.
There are two types of input: one that branches at splitter 4i2 and is input through 4i1, and the other that inputs bidirectionally. That is,
Input can be received from the right or left, and bidirectional input signals can be received.
このようにして、双方向性の光データ・バスが
実現できる。この光データ・バスにおいて、ある
２つの通信ステーシヨン間で通信を行なう時、途
中に介在する光カツプラの数は、途中に介在する
通信ステーシヨンの数に等しい。これは、従来の
場合の半分であつて、それだけ損失の少ないもの
となる。 In this way, a bidirectional optical data bus can be realized. When communicating between two communication stations on this optical data bus, the number of intervening optical couplers is equal to the number of intervening communication stations. This is half of the conventional case, and the loss is correspondingly smaller.
また、伝送線１，２のいずれにも、とくに能動
素子を含まないので、信頼性が高い。 Further, since neither of the transmission lines 1 and 2 includes any active elements, reliability is high.
いま、伝送線１または２が通信ステーシヨン３
ｉと３（ｉ＋１）の間で断線したとすると、断線
箇所を境にして右と左では、通信がとだえるが、
右の系統内および左の系統内では、それぞれ上記
と同様にして、双方向性の通信が続けられる。す
なわち、フエイル・ソフトである。 Now, transmission line 1 or 2 is connected to communication station 3.
If there is a disconnection between i and 3 (i+1), communication will stop on the right and left sides of the disconnection point, but
Bidirectional communication continues within the right system and within the left system, respectively, in the same manner as described above. In other words, it is fail software.
第１図は、本発明実施例の概念的な構成図、第
２図は、第１図の一部分の具体例の構成図であ
る。
１，２……光伝送線、３１−３ｎ……通信ステ
ーシヨン、３１１−３ｎ１……受信機、３１２−
３ｎ２……送信器、４１１−４ｎ１，４１２−４
ｎ２……ビーム・スブリツタ、４０……ハーフ・
ミラー。
FIG. 1 is a conceptual block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of a specific example of a portion of FIG. 1, 2...Optical transmission line, 31-3n...Communication station, 311-3n1...Receiver, 312-
3n2...Transmitter, 411-4n1, 412-4
n2...Beam Subrita, 40...Half
mirror.
Claims (1)
光路を持ちこれら光路の光をそれぞれ分岐して互
に相手の光路に挿入するビーム・スプリツタであ
つて各通信ステーシヨンの受信器ごとに設けられ
上記２本の伝送線のうちの一方に１つの光路が方
向をそろえて直列に接続され他の光路が通信ステ
ーシヨンの受信器に接続された第１のビーム・ス
プリツタ、および、同様なビーム・スプリツタで
あつて、各通信ステーシヨンの送信器ごとに設け
られ上記伝送線の他方に１つの光路が第１のビー
ム・スプリツタとは逆方向に方向をそろえて直列
に接続され、他の光路が通信ステーシヨンの送信
器に接続されるとともに第１のビーム・スプリツ
タの他の光路と直列に接続された第２のビーム・
スプリツタを備えた双方向性光データ・バス。1 A beam splitter that has two optical transmission lines laid in parallel and two optical paths, and splits the light from each of these optical paths and inserts the light into the other's optical path, and is installed at each receiver of each communication station. a first beam splitter provided and having one optical path connected in series in alignment with one of said two transmission lines and the other optical path connected to a receiver of a communication station, and a similar beam; - A splitter, which is provided for each transmitter of each communication station, and one optical path is connected in series with the other side of the transmission line aligned in the opposite direction to the first beam splitter, and the other optical path is connected in series to the other side of the transmission line. a second beam splitter connected to the transmitter of the communication station and in series with the other optical path of the first beam splitter;
Bidirectional optical data bus with splitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56211809A JPS58111447A (en) | 1981-12-24 | 1981-12-24 | Bidirectional optical data bus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56211809A JPS58111447A (en) | 1981-12-24 | 1981-12-24 | Bidirectional optical data bus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58111447A JPS58111447A (en) | 1983-07-02 |
| JPS6211537B2 true JPS6211537B2 (en) | 1987-03-13 |
Family
ID=16611951
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56211809A Granted JPS58111447A (en) | 1981-12-24 | 1981-12-24 | Bidirectional optical data bus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58111447A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2522379B2 (en) * | 1989-01-26 | 1996-08-07 | 日本電気株式会社 | Space optical transmission device |
-
1981
- 1981-12-24 JP JP56211809A patent/JPS58111447A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58111447A (en) | 1983-07-02 |
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