JPH0314248B2 - - Google Patents
Info
- Publication number
- JPH0314248B2 JPH0314248B2 JP59014687A JP1468784A JPH0314248B2 JP H0314248 B2 JPH0314248 B2 JP H0314248B2 JP 59014687 A JP59014687 A JP 59014687A JP 1468784 A JP1468784 A JP 1468784A JP H0314248 B2 JPH0314248 B2 JP H0314248B2
- Authority
- JP
- Japan
- Prior art keywords
- optical
- polarization
- transmission line
- station
- electro
- 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 - Lifetime
Links
- 230000003287 optical effect Effects 0.000 claims description 126
- 230000005540 biological transmission Effects 0.000 claims description 45
- 230000010287 polarization Effects 0.000 claims description 33
- 230000008878 coupling Effects 0.000 claims description 17
- 238000010168 coupling process Methods 0.000 claims description 17
- 238000005859 coupling reaction Methods 0.000 claims description 17
- 238000004891 communication Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 16
- 239000013307 optical fiber Substances 0.000 description 13
- 101001139126 Homo sapiens Krueppel-like factor 6 Proteins 0.000 description 5
- 102100029962 CMP-N-acetylneuraminate-beta-1,4-galactoside alpha-2,3-sialyltransferase Human genes 0.000 description 3
- 101710136075 CMP-N-acetylneuraminate-beta-1,4-galactoside alpha-2,3-sialyltransferase Proteins 0.000 description 3
- 239000013256 coordination polymer Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- 102100023189 Armadillo repeat-containing protein 3 Human genes 0.000 description 2
- 101000684962 Homo sapiens Armadillo repeat-containing protein 3 Proteins 0.000 description 2
- 101100018027 Pisum sativum HSP70 gene Proteins 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 102100031910 A-kinase anchor protein 3 Human genes 0.000 description 1
- 101000774732 Homo sapiens A-kinase anchor protein 3 Proteins 0.000 description 1
- 101001126084 Homo sapiens Piwi-like protein 2 Proteins 0.000 description 1
- 102100029365 Piwi-like protein 2 Human genes 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000005693 optoelectronics 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4637—Interconnected ring systems
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computing Systems (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Small-Scale Networks (AREA)
- Optical Communication System (AREA)
Description
【発明の詳細な説明】
≪発明の利用分野≫
本発明は、光フアイバーを介して複数のステー
シヨンなどの間の通信を行なうループ形光データ
ウエイの改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION <<Field of Application of the Invention>> The present invention relates to an improvement in a loop-type optical dataway for communicating between a plurality of stations via optical fibers.
≪従来技術≫
第１図は光スイツチを用いた従来のループ形光
データウエイを示すブロツク構成図である。ステ
ーシヨンST１１，ST１２，…，ST１Ｎは光結
合器Ａ１１，Ａ１２，…，Ａ１Ｎを介してループ
形光伝送線路Ｌ１と接続している。光結合器Ａ１
１，Ａ１２，…，Ａ１Ｎの各スイツチは各ステー
シヨンの動作が正常の時は実線のように接続し、
各ステーシヨンにおいて光電・電光変換などを用
いて再生中継が行われ、基本的には１対１の伝送
が行われる。すなわち、ステーシヨンST１１，
ST１２，…，ST１Ｎの送出信号Ｔ１１，Ｔ１
２，…，Ｔ１ＮはそれぞれST１２，…，ST１
Ｎ，ST１１の受信信号Ｒ１２，…，Ｒ１Ｎ，Ｒ
１１となり受信再生された後ST１２，…，ST１
Ｎ，ST１１の送出信号Ｔ１２，…，Ｔ１Ｎ，Ｔ
１１となり以下同様に繰返し再生中継される。ス
テーシヨンの動作が異常（例えば電源断）の時に
は点線のように切り換わり、該当ステーシヨンを
バイパスする。第２図はステーシヨンST１２の
みが異常でバイパスされている場合を示してい
る。<<Prior Art>> FIG. 1 is a block diagram showing a conventional loop-type optical dataway using an optical switch. The stations ST11, ST12, . . . , ST1N are connected to the loop optical transmission line L1 via optical couplers A11, A12, . Optical coupler A1
When the operation of each station is normal, each switch of 1, A12, ..., A1N is connected as shown by the solid line.
Regenerative relay is performed at each station using photoelectric/electronic conversion, etc., and basically one-to-one transmission is performed. That is, station ST11,
Sending signals T11, T1 of ST12,..., ST1N
2,...,T1N are ST12,...,ST1 respectively
N, ST11 received signal R12,..., R1N,R
11 and after receiving and playing ST12,...,ST1
N, ST11 sending signal T12,...,T1N,T
11, and the playback is repeated in the same manner. When the operation of the station is abnormal (for example, the power is cut off), the station is switched as shown by the dotted line and the corresponding station is bypassed. FIG. 2 shows a case where only the station ST12 is abnormal and is bypassed.
この方式では送受信間の減衰は問題とならない
が、信号が再生を繰り返すため遅延が大きくな
り、通信エラーが累積して誤り率が大きくなると
いう欠点を有している。 Although attenuation between transmission and reception is not a problem in this system, it has the disadvantage that the delay increases because the signal is repeatedly reproduced, and communication errors accumulate, increasing the error rate.
≪発明の目的≫
本発明は上記の問題点を解決するためになされ
たもので、高信頼性で伝送遅延が少なく誤り率が
低いとともに送受信間の減衰量が小さいループ形
の光データウエイを実現することを目的としてい
る。<<Purpose of the Invention>> The present invention has been made to solve the above problems, and realizes a loop-shaped optical dataway with high reliability, low transmission delay, low error rate, and low attenuation between transmitting and receiving. It is intended to.
≪発明の概要≫
本発明に係る光データウエイの第１はループ形
の光伝送線路と、ループ形の光伝送線路とと接続
する光結合器と、この光結合器と接続するステー
シヨンとを備え、光伝送線路を介して複数のステ
ーシヨンの間の通信を行なうループ形の光データ
ウエイにおいて、
前記光結合器は、
入力光がその少なくとも一方に入射するビーム
スプリツタと全反射プリズムで構成された偏光分
離器、
この偏光分離器で分離された２つの偏光波がそ
れぞれ照射される電気光学素子、
ビームスプリツタと全反射プリズムで構成され
前記電気光学素子を通つた光が入射する偏光合成
器
を具備し、
電圧信号が印加されて前記電気光学素子が照射
光の偏光面を回転することにより前記偏光分離器
へ入射する前記入力光を前記偏光合成器からそれ
ぞれ所定の方向に所定の割合で送出するように構
成され、
前記ステーシヨンからの電気的制御信号で前記
光結合器の結合比をステーシヨンが光信号を送信
するときには１としステーシヨンが光信号を受信
するときには１以下の所定の値とするように構成
したことを特徴とする。<<Summary of the Invention>> The first optical dataway according to the present invention includes a loop-shaped optical transmission line, an optical coupler connected to the loop-shaped optical transmission line, and a station connected to the optical coupler. In a loop-type optical dataway that performs communication between a plurality of stations via an optical transmission line, the optical coupler is composed of a beam splitter and a total reflection prism, into which input light is incident at least one of them. a polarization separator, an electro-optical element to which the two polarized waves separated by the polarization separator are irradiated, and a polarization combiner to which the light that has passed through the electro-optic element is incident, which is composed of a beam splitter and a total reflection prism. The electro-optical element rotates the polarization plane of the irradiated light upon application of a voltage signal, so that the input light incident on the polarization separator is sent out from the polarization combiner in each predetermined direction at a predetermined ratio. The coupling ratio of the optical coupler is set to 1 when the station transmits an optical signal and to a predetermined value of 1 or less when the station receives an optical signal using an electrical control signal from the station. It is characterized by being configured as follows.
本発明に係る光データウエイの第２はループ形
の光伝送線路と、この光伝送線路と接続する第１
の光結合器と、この第１の光結合器と接続するス
テーシヨンとを備え、光伝送線路を介して複数の
ステーシヨンの間の通信を行なうループ形の光デ
ータウエイにおいて、
前記光伝送線路と接続する結合比可変の第２の
光結合器と、
この第２の光結合器の結合比を電気的制御信号
で設定する制御手段と、
前記第２の光結合器と接続する他の光伝送線路
と
を備え、
前記ステーシヨンからの電気的制御信号で前記
光結合器の結合比をステーシヨンが光信号を送信
するときには１としステーシヨンが光信号を受信
するときには１以下の所定の値とするとともに、
前記光結合器は、
入力光がその少なくとも一方に入射するビーム
スプリツタと全反射プリズムで構成された偏光分
離器、
この偏光分離器で分離された２つの偏光波がそ
れぞれ照射される電気光学素子、
ビームスプリツタと全反射プリズムで構成され
前記電気光学素子を通つた光が入射する偏光合成
器
を具備し、
電圧信号が印加されて前記電気光学素子が照射
光の偏光面を回転することにより前記偏光分離器
へ入射する前記入力光を前記偏光合成器からそれ
ぞれ所定の方向に所定の割合で送出するように構
成されたことを特徴とする。 The second optical dataway according to the present invention includes a loop-shaped optical transmission line and a first optical transmission line connected to this optical transmission line.
A loop-type optical dataway that communicates between a plurality of stations via an optical transmission line, comprising an optical coupler and a station connected to the first optical coupler, the optical data way being connected to the optical transmission line. a second optical coupler with a variable coupling ratio; a control means for setting the coupling ratio of the second optical coupler using an electrical control signal; and another optical transmission line connected to the second optical coupler. and setting the coupling ratio of the optical coupler to 1 when the station transmits an optical signal and to a predetermined value of 1 or less when the station receives an optical signal using an electrical control signal from the station, and The optical coupler includes: a polarization separator composed of a beam splitter and a total reflection prism, into which input light is incident at least on one side; an electro-optical element to which the two polarized waves separated by the polarization separator are respectively irradiated; A polarization combiner configured with a beam splitter and a total reflection prism and into which the light that has passed through the electro-optic element is incident; when a voltage signal is applied, the electro-optic element rotates the polarization plane of the irradiated light, thereby The present invention is characterized in that the input light incident on the polarization separator is configured to be sent out from the polarization combiner in respective predetermined directions at a predetermined rate.
≪実施例≫ 以下本発明を図面を用いて詳しく説明する。≪Example≫ The present invention will be explained in detail below using the drawings.
第３図は本発明に係わる光データウエイの一実
施例を示すブロツク構成図である。Ｌ３はループ
形の光伝送線路、Ａ３１，Ａ３２，…，Ａ３Ｎは
この光伝送線路Ｌ３と接続する結合比可変の光結
合器、ST３１，ST３２，…，ST３Ｎはこの光
結合器Ａ３１，Ａ３２，…，Ａ３Ｎとそれぞれ接
続するステーシヨンである。 FIG. 3 is a block diagram showing an embodiment of the optical dataway according to the present invention. L3 is a loop-shaped optical transmission line, A31, A32,..., A3N are optical couplers with variable coupling ratios connected to this optical transmission line L3, ST31, ST32,..., ST3N are optical couplers A31, A32,... , A3N, respectively.
各ステーシヨンST３１，ST３２，…，ST３
Ｎは送受信状態、受信信号レベル、自ステーシヨ
ンの状態などに応じて各制御信号Ｃ３１，Ｃ３
２，…，Ｃ３Ｎにより光結合器Ａ３１，Ａ３２，
…，Ａ３Ｎの結合比を動的かつ連続的に変化させ
る。第４図はステーシヨンST３１のみを送信状
態とし、その他のステーシヨンを受信状態とした
場合を示している。 Each station ST31, ST32,..., ST3
N is the control signal C31, C3 depending on the transmission/reception status, received signal level, status of own station, etc.
2,...,C3N allows optical couplers A31, A32,
..., the binding ratio of A3N is dynamically and continuously changed. FIG. 4 shows a case where only the station ST31 is in the transmitting state and the other stations are in the receiving state.
第５図は結合比をα１としたときの前記光結合
器の入出力関係を示す説明図である。入力光信号
Ｉ１，Ｉ２と出力光信号Ｏ１，Ｏ２との間には次
の関係式がある。 FIG. 5 is an explanatory diagram showing the input/output relationship of the optical coupler when the coupling ratio is α1. The following relational expression exists between the input optical signals I1, I2 and the output optical signals O1, O2.
O1
O2＝１−α1 α1
α1 １−α1 I1
I2
第４図において前記結合比α1を送信時に１と
し受信時には１以下の所定の値αとなるように制
御すれば、最大の減衰が生じるステーシヨンST
３１，ST３Ｎ間の送受信の場合、伝送ゲインＧ
は次式で表わされる。 O1 O2=1−α1 α1 α1 1−α1 I1 I2 In FIG. 4, if the coupling ratio α1 is controlled to be 1 at the time of transmission and a predetermined value α of 1 or less at the time of reception, the maximum attenuation occurs at the station ST.
31, for transmission and reception between ST3N, transmission gain G
is expressed by the following equation.
Ｇ＝α（１−α）N-2
これはα＝１／（Ｎ−１）の時に最大となり、こ
れを代入すると最大伝送ゲインGtは次式で表わ
される。 G=α(1-α) N-2 This becomes maximum when α=1/(N-1), and by substituting this, the maximum transmission gain Gt is expressed by the following equation.
Gt＝（１−１／(N-1)）N-2／(N-1)
≒e-1（Ｎ−１）（Ｎ≫１） ……(1)
すなわち減衰はＮに比例する。（実際には伝送線
路の減衰がこれに加わる。）
従来のマルチドロツプ形光データウエイにおけ
る最大伝送ゲイン通常N-2に比例しているが、第
３図の実施例における最大伝送ゲインGTは(1)式
よりN-1に比例している。したがつて前記実施例
は従来のマルチドロツプ形光データウエイにくら
べ、減衰量が小さい。逆に減衰量を同一とすれ
ば、従来のマルチドロツプ形光データウエイにく
らべ、ステーシヨンの数を増すことができる。 Gt=(1-1/(N-1)) N-2 /(N-1) ≒e -1 (N-1) (N≫1) ...(1) That is, the attenuation is proportional to N. (Actually, the attenuation of the transmission line is added to this.) The maximum transmission gain in a conventional multidrop optical dataway is normally proportional to N -2 , but the maximum transmission gain GT in the embodiment shown in Fig. 3 is (1 ) formula, it is proportional to N -1 . Therefore, the embodiment described above has a smaller amount of attenuation than the conventional multi-drop optical data way. Conversely, if the amount of attenuation is kept the same, the number of stations can be increased compared to the conventional multi-drop optical dataway.
また従来のループ形光データウエイにくらべ、
再生中継を介在させないので、信号受信の際遅延
が少なく誤り率も増加しない。 Also, compared to conventional loop-type optical dataways,
Since no regenerative relay is involved, there is little delay in signal reception and no increase in error rate.
また送信した信号が自ステーシヨンに戻るた
め、伝送路長や減衰量が測定でき、伝送路の異常
も察知できる。 Furthermore, since the transmitted signal returns to its own station, the length and attenuation of the transmission path can be measured, and abnormalities in the transmission path can also be detected.
また従来のループ伝送に関する種々の技術（ル
ープバツク等）をそのまま利用できるという利点
もある。 Another advantage is that various techniques related to conventional loop transmission (loopback, etc.) can be used as is.
第６図は第５図の光結合器の一実施例を示す構
成説明図である。この光結合器の構成は特願昭58
−146652号「高速光スイツチ」に示したものとほ
ぼ同じで、PLZTの電気光学効果を利用したもの
である。図において、７１，７２はそれぞれ入力
光信号Ｉ１，Ｉ２を導く光フアイバー、７３，７
４はこの光フアイバー７１，７２に結合する光フ
アイバーコネクターである。二重の実線で囲んだ
部分CPは光結合部であつて、この中は例えば40
〜50℃の温度に維持されるようになつている。光
結合部CPにおいて、７５，７６はそれぞれ前記
光フアイバーコネクター７３，７４を通つて入つ
てくる入力光を集光させるレンズ、７７はビーム
スプリツタ７７１と全反射プリズム７７２とを組
合せて構成した偏光分離器で、ここにレンズ７
５，７６を通つて入力光が入射する。７８および
７９はそれぞれ７７から出た２つの偏光波が照射
さるように設置されたPLZT、８０はこのPLZT
７８，７９に制御信号を与えるためのドライブ端
子、８１はビームスプリツタ８１１と全反射プリ
ズム８１２とを組合せて構成した偏光合成器で、
ここには、各PLZT７８および７９を通つた光が
入射する。８２，８３はレンズで、それぞれ
PLZT７８および７９に焦点が合うように設置さ
れている。８４，８５は光フアイバ用コネクター
で、レンズ８２，８３を通つた偏光合成器８１か
らの出力光が、ここを通り、出力光信号Ｏ１，Ｏ
２として光フアイバ８６，８７に導かれる。 FIG. 6 is a configuration explanatory diagram showing one embodiment of the optical coupler of FIG. 5. The configuration of this optical coupler was patented in 1983.
It is almost the same as the one shown in No. 146652, "High-speed optical switch," and utilizes the electro-optic effect of PLZT. In the figure, 71 and 72 are optical fibers that guide input optical signals I1 and I2, respectively, and 73 and 7
Reference numeral 4 denotes an optical fiber connector that is coupled to the optical fibers 71 and 72. The part CP surrounded by the double solid line is the optical coupling part, and it contains, for example, 40
The temperature is maintained at ~50°C. In the optical coupling part CP, 75 and 76 are lenses that condense the input light that enters through the optical fiber connectors 73 and 74, respectively, and 77 is a polarized light constructed by combining a beam splitter 771 and a total reflection prism 772. In the separator, here is lens 7
Input light enters through 5 and 76. 78 and 79 are PLZTs installed so that the two polarized waves emitted from 77 are irradiated, and 80 is this PLZT.
78 and 79 are drive terminals for giving control signals; 81 is a polarization combiner configured by combining a beam splitter 811 and a total reflection prism 812;
Light that has passed through each PLZT 78 and 79 is incident here. 82 and 83 are lenses, respectively.
It is set so that PLZT78 and 79 are in focus. 84 and 85 are optical fiber connectors, through which the output light from the polarization combiner 81 that has passed through lenses 82 and 83 passes, and output optical signals O1 and O.
2 to optical fibers 86 and 87.
このように構成した光結合器の動作を次に説明
する。光結合部CPにおいて、レンズ７５を通つ
て偏光分離器７７に入射した光は、Ｓ波とＰ波に
分離し、Ｐ波はPLZT７９に、Ｓ波はPLZT７８
にそれぞれ入る。ここでPLZT７８，７９は制御
電圧が印加されなければ電気光学効果は生じな
い。したがつて、この状態では、PLZT７９を通
つたＰ波およびPLZT７８を通つたＳ波は、いず
れもレンズ８２、光フアイバ用コネクター８４を
通つて、光フアイバー８６側に出力される。
PLZT７８，７９に制御電圧が印加されると、電
気光学効果が生じ、ここを通過するＰ波はＳ波
に、Ｓ波はＰ波に、それぞれ偏光面が90°回転す
る。この結果、PLZT７８を通過しＰ波となつた
光およびPLZT７９を通過しＳ波となつた光は、
いずれも偏光合成器８１に入射後、レンズ８３、
光フアイバ用コネクター８５を通つて、光フアイ
バー８７側に出力される。レンズ７６を通つて偏
光分離器７７に入射した光についても同様で、
PLZT７８，７９に制御電圧が印加されなければ
光フアイバー８７側に出力され、制御電圧が印加
されれば光フアイバー８６側に出力される。 The operation of the optical coupler configured in this way will be explained next. In the optical coupling part CP, the light that has passed through the lens 75 and entered the polarization separator 77 is separated into an S wave and a P wave.
into each. Here, the PLZTs 78 and 79 do not produce an electro-optical effect unless a control voltage is applied. Therefore, in this state, both the P wave that has passed through the PLZT 79 and the S wave that has passed through the PLZT 78 are output to the optical fiber 86 side through the lens 82 and the optical fiber connector 84.
When a control voltage is applied to the PLZTs 78 and 79, an electro-optic effect occurs, and the plane of polarization is rotated by 90 degrees, so that the P wave passing through the PLZTs becomes an S wave, and the S wave becomes a P wave. As a result, the light that passed through PLZT78 and became a P wave, and the light that passed through PLZT79 and became an S wave,
After entering the polarization combiner 81, the lens 83,
It passes through the optical fiber connector 85 and is output to the optical fiber 87 side. The same goes for the light that enters the polarization separator 77 through the lens 76.
If no control voltage is applied to the PLZTs 78 and 79, the output is output to the optical fiber 87 side, and if a control voltage is applied, the output is output to the optical fiber 86 side.
このように構成された装置によれば、制御電圧
によつて光入力信号Ｉ１およびＩ２を光出力Ｏ１
またはＯ２へ切換えることができる。すなわち制
御電圧がOVの場合光入力Ｉ１は光出力Ｏ１とな
り、光入力Ｉ２は光出力Ｏ２となる。制御電圧を
OVから増加していくにしたがつて、光入力Ｉ２
は光出力Ｏ２へ、光入力Ｉ２は光出力Ｏ１へ次第
に移つてゆく。第７図はこの様子を示した特性曲
線図で、制御電圧により、Ｉ１からＯ１への光透
過率α11（すなわち第５図の１−α1）およびＩ１
からＯ２への光透過率α12（第５図の結合比α１）
がどのように変化するかを実測したものである。
このように光透過率を制御電圧により任意にかつ
連続的にコントロールすることができる。また電
気光学素子を用いているので、結合比の切換えも
十分高速で行われる。 According to the device configured in this way, the optical input signals I1 and I2 are changed to the optical output O1 by the control voltage.
Or you can switch to O2. That is, when the control voltage is OV, the optical input I1 becomes the optical output O1, and the optical input I2 becomes the optical output O2. control voltage
As increasing from OV, optical input I2
gradually shifts to the optical output O2, and the optical input I2 gradually shifts to the optical output O1. FIG. 7 is a characteristic curve diagram showing this situation, in which the light transmittance α11 from I1 to O1 (i.e., 1−α1 in FIG. 5) and I1 change depending on the control voltage.
Light transmittance α12 from to O2 (coupling ratio α1 in Figure 5)
This is an actual measurement of how it changes.
In this way, the light transmittance can be arbitrarily and continuously controlled by the control voltage. Furthermore, since an electro-optical element is used, the coupling ratio can be switched at a sufficiently high speed.
なお上記の実施例では光結合器においてPLZT
などの電気光学素子を用いたが、これに限らず
YIGなどの磁気光学素子を用いてもよい。 Note that in the above example, PLZT is used in the optical coupler.
We used electro-optical elements such as, but are not limited to
A magneto-optical element such as YIG may also be used.
第８図は本発明に係わる光データウエイの他の
実施例を示すブロツク構成図で、２つのループ形
光データウエイを第３のループ形光データウエイ
と前記光結合器を用いて結合したものである。図
において、ST４１，ST４２，…，ST４Ｎは光
結合器Ａ４１，ST４２，…，ST４Ｎを介してル
ープ形の光伝送線路Ｌ４と結合し、ST５１，ST
５２，…，ST５Ｎは光結合器Ａ５１，Ａ５２，
…，Ａ５Ｎを介してループ形の光伝送線路Ｌ５と
結合している。光伝送線路Ｌ４および光伝送線路
Ｌ５はそれぞれ光結合器Ａ６１，Ａ６２を介して
ループ形の光伝送線路Ｌ６と結合している。光結
合器Ａ６１，Ａ６２はそれぞれ制御手段CT８１，
８２によつて切換えを制御され、制御手段CT８
１，８２はループ制御手段CT８０によつて制御
される。 FIG. 8 is a block diagram showing another embodiment of the optical dataway according to the present invention, in which two loop-type optical dataways are coupled to a third loop-type optical dataway using the optical coupler. It is. In the figure, ST41, ST42, ..., ST4N are coupled to a loop-shaped optical transmission line L4 via optical couplers A41, ST42, ..., ST4N, and ST51, ST
52,..., ST5N are optical couplers A51, A52,
..., A5N to the loop-shaped optical transmission line L5. The optical transmission line L4 and the optical transmission line L5 are coupled to a loop-shaped optical transmission line L6 via optical couplers A61 and A62, respectively. Optical couplers A61 and A62 are controlled by control means CT81 and
The switching is controlled by control means CT8
1 and 82 are controlled by loop control means CT80.
第９図は本発明に係わる光データウエイの第３
図の実施例を示すブロツク構成図の管理ステーシ
ヨンから送出されたアドレス信号を各ローカルス
テーシヨンで解読し、指定されたローカルステー
シヨンから温度、圧力などのプロセス量をループ
に送出するようにしたものである。図において、
温度、圧力、流量などのプロセス量を検出するセ
ンサTR１，TR２，…，TRNはそれぞれローカ
ルステーシヨンST７１，ST７２，…，ST７Ｎ
に接続し、ローカルステーシヨンST７１，ST７
２，…，ST７Ｎはそれぞれ光結合器Ａ７１，Ａ
７２，…，Ａ７Ｎを介してループ形の光伝送線路
Ｌ７と結合する。ループ形の光伝送線路Ｌ７は光
結合器Ａ７０を介して管理ステーシヨンST７０
に接続する。 FIG. 9 shows the third optical dataway according to the present invention.
The address signal sent from the management station in the block configuration diagram showing the embodiment shown in the figure is decoded at each local station, and process variables such as temperature and pressure are sent to the loop from the designated local station. . In the figure,
Sensors TR1, TR2, ..., TRN that detect process variables such as temperature, pressure, flow rate, etc. are located at local stations ST71, ST72, ..., ST7N, respectively.
Connect to local station ST71, ST7
2,..., ST7N are optical couplers A71, A, respectively.
72, . . . , A7N to the loop-shaped optical transmission line L7. A loop-shaped optical transmission line L7 is connected to the management station ST70 via an optical coupler A70.
Connect to.
第１０図は第９図の装着の動作を説明するため
のタイムチヤート例である。Ａのアドレス信号で
ローカルステーシヨンST７１が指定され、Ｂの
タイミングで温度データが送出される。再びＣの
アドレス信号でローカルステーシヨンST７２が
指定され、Ｄのタイミングで圧力データが送出さ
れる。 FIG. 10 is an example of a time chart for explaining the mounting operation shown in FIG. 9. The local station ST71 is specified by the address signal A, and temperature data is sent out at the timing B. Local station ST72 is designated again by the address signal C, and pressure data is sent out at timing D.
≪発明の効果≫
以上述べたように本発明によれば高信頼性で伝
送遅延が少なく誤り率が低いとともに送受信間の
減衰量が小さいループ形の光データウエイを実現
することができる。<<Effects of the Invention>> As described above, according to the present invention, it is possible to realize a loop-type optical dataway with high reliability, low transmission delay, low error rate, and small attenuation between transmission and reception.
第１図は光スイツチを用いた従来のループ形光
データウエイを示すブロツク構成図、第２図は第
１図の装置の動作例を示す動作説明図、第３図は
本発明に係わるループ形光データウエイの一実施
例を示すブロツク構成図、第４図は第３図の装置
の動作例を示す動作説明図、第５図は第３図の光
結合器の入出力関係を示す説明図、第６図は第５
図の光結合器の一実施例を示す構成説明図、第７
図は光結合器の入出力特性を示す特性曲線図、第
８図は本発明に係わるループ形光データウエイの
他の実施例を示すブロツク構成図、第９図は本発
明に係わるループ形光データウエイの第３の実施
例を示すブロツク構成図、第１０図は第９図の装
置の動作を説明するためのタイムチヤート例であ
る。
７７……偏光分離器、７８，７９……電気光学
素子、８１……偏光合成器、７７１，８１１……
ビームスプリツタ、７７２，８１２……全反射プ
リズム、Ｌ３，Ｌ４，Ｌ５，Ｌ７……光伝送線
路、Ｌ６……他の光伝送線路、Ａ３１〜Ａ３Ｎ、
Ａ４１〜Ａ４Ｎ，Ａ５１〜Ａ５Ｎ，Ａ７０〜Ａ７
Ｎ……（第１の）光結合器、Ａ６１，Ａ６２……
第２の光結合器、CT８１，CT８２……制御手
段、ST３１，ST３２，…，ST３Ｎ，ST４１，
ST４２，…，ST４Ｎ，ST５１，ST５２，…，
ST５Ｎ，ST７０，ST７１，ST７２，…，ST
７Ｎ……ステーシヨン、Ｃ３１，Ｃ３２，…，Ｃ
３Ｎ……制御信号、α１……結合比。
FIG. 1 is a block configuration diagram showing a conventional loop-type optical data way using an optical switch, FIG. 2 is an operation explanatory diagram showing an example of the operation of the device in FIG. 1, and FIG. FIG. 4 is an explanatory diagram showing an example of the operation of the device in FIG. 3; FIG. 5 is an explanatory diagram showing the input/output relationship of the optical coupler in FIG. 3. , Figure 6 is the fifth
Configuration explanatory diagram showing one embodiment of the optical coupler shown in the figure, No. 7
Figure 8 is a characteristic curve diagram showing the input/output characteristics of the optical coupler, Figure 8 is a block configuration diagram showing another embodiment of the loop type optical dataway according to the present invention, and Figure 9 is a diagram showing the loop type optical data way according to the present invention. FIG. 10 is a block diagram showing a third embodiment of the data way, and is an example of a time chart for explaining the operation of the device shown in FIG. 77... Polarization separator, 78, 79... Electro-optical element, 81... Polarization combiner, 771, 811...
Beam splitter, 772, 812... Total reflection prism, L3, L4, L5, L7... Optical transmission line, L6... Other optical transmission line, A31 to A3N,
A41~A4N, A51~A5N, A70~A7
N... (first) optical coupler, A61, A62...
Second optical coupler, CT81, CT82...control means, ST31, ST32,..., ST3N, ST41,
ST42,…, ST4N, ST51, ST52,…,
ST5N, ST70, ST71, ST72,..., ST
7N...Station, C31, C32,...,C
3N...control signal, α1...coupling ratio.
Claims (1)
接続する光結合器と、この光結合器と接続するス
テーシヨンとを備え、光伝送線路を介して複数の
ステーシヨンの間の通信を行なう光データウエイ
において、 前記光結合器は、 入力光がその少なくとも一方に入射するビーム
スプリツタと全反射プリズムで構成された偏光分
離器、 この偏光分離器で分離された２つの偏光波がそ
れぞれ照射される電気光学素子、 ビームスプリツタと全反射プリズムで構成され
前記電気光学素子を通つた光が入射する偏光合成
器 を具備し、 電圧信号が印加されて前記電気光学素子が照射
光の偏光面を回転することにより前記偏光分離器
へ入射する前記入力光を前記偏光合成器からそれ
ぞれ所定の方向に所定の割合で送出するように構
成され、 前記ステーシヨンからの電気的制御信号で前記
光結合器の結合比をステーシヨンが光信号を送信
するときには１としステーシヨンが光信号を受信
するときには１以下の所定の値とするように構成
したことを特徴とするループ形の光データウエ
イ。 ２ ループ形の光伝送線路と、この光伝送線路と
接続する第１の光結合器と、この第１の光結合器
と接続するステーシヨンとを備え、光伝送線路を
介して複数のステーシヨンの間の通信を行なう光
データウエイにおいて、 前記光伝送線路と接続する結合比可変の第２の
光結合器と、 この第２の光結合器の結合比を電気的制御信号
で設定する制御手段と、 前記第２の光結合器と接続する他の光伝送線路
と を備え、 前記ステーシヨンからの電気的制御信号で前記
第１の光結合器の結合比をステーシヨンが光信号
を送信するときには１としステーシヨンが光信号
を受信するときには１以下の所定の値とするとと
もに、 前記光結合器は、 入力光がその少なくとも一方に入射するビーム
スプリツタと全反射プリズムで構成された偏光分
離器、 この偏光分離器で分離された２つの偏光波がそ
れぞれ照射される電気光学素子、 ビームスプリツタと全反射プリズムで構成され
前記電気光学素子を通つた光が入射する偏光合成
器 を具備し、 電圧信号が印加されて前記電気光学素子が照射
光の偏光面を回転することにより前記偏光分離器
へ入射する前記入力光を前記偏光合成器からそれ
ぞれ所定の方向に所定の割合で送出するように構
成されたことを特徴とするループ形の光データウ
エイ。[Claims] 1. A system comprising a loop-shaped optical transmission line, an optical coupler connected to the optical transmission line, and a station connected to the optical coupler, and connecting a plurality of stations via the optical transmission line. In an optical dataway that performs communication, the optical coupler includes: a polarization separator composed of a beam splitter and a total reflection prism, into which input light is incident at least on one side; and two polarized lights separated by the polarization separator. an electro-optical element to which the waves are irradiated, and a polarization synthesizer configured with a beam splitter and a total reflection prism and into which the light that has passed through the electro-optic element is incident, and a voltage signal is applied to irradiate the electro-optic element. The input light incident on the polarization separator is configured to be transmitted from the polarization combiner in a predetermined direction at a predetermined ratio by rotating the polarization plane of the light, and is configured to transmit the input light incident on the polarization splitter at a predetermined ratio in a predetermined direction, and is configured to rotate the polarization plane of the light by an electrical control signal from the station. A loop-type optical dataway characterized in that the coupling ratio of the optical coupler is configured to be 1 when the station transmits an optical signal and to a predetermined value of 1 or less when the station receives the optical signal. 2 Equipped with a loop-shaped optical transmission line, a first optical coupler connected to this optical transmission line, and a station connected to this first optical coupler, and connected between multiple stations via the optical transmission line. an optical dataway for performing communication, comprising: a second optical coupler with a variable coupling ratio connected to the optical transmission line; a control means for setting the coupling ratio of the second optical coupler using an electrical control signal; another optical transmission line connected to the second optical coupler, and sets the coupling ratio of the first optical coupler to 1 when the station transmits an optical signal using an electrical control signal from the station. is set to a predetermined value of 1 or less when receiving an optical signal, and the optical coupler includes: a polarization separator composed of a beam splitter and a total reflection prism into which input light is incident at least one of the two; an electro-optical element on which the two polarized waves separated by the electro-optical element are respectively irradiated; a polarization combiner, which is composed of a beam splitter and a total reflection prism, and on which the light that has passed through the electro-optical element enters; and a voltage signal is applied. and the electro-optical element is configured to rotate the polarization plane of the irradiated light so that the input light incident on the polarization separator is transmitted from the polarization combiner in each predetermined direction at a predetermined ratio. A loop-shaped optical dataway featuring
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59014687A JPS60158742A (en) | 1984-01-30 | 1984-01-30 | Optical data way |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59014687A JPS60158742A (en) | 1984-01-30 | 1984-01-30 | Optical data way |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60158742A JPS60158742A (en) | 1985-08-20 |
| JPH0314248B2 true JPH0314248B2 (en) | 1991-02-26 |
Family
ID=11868109
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59014687A Granted JPS60158742A (en) | 1984-01-30 | 1984-01-30 | Optical data way |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60158742A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4730301A (en) * | 1985-12-20 | 1988-03-08 | Polaroid Corporation | Wavelength multiplexed optical communications system and method |
| US4759011A (en) * | 1986-03-03 | 1988-07-19 | Polaroid Corporation | Intranetwork and internetwork optical communications system and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS531404A (en) * | 1976-06-28 | 1978-01-09 | Nippon Telegr & Teleph Corp <Ntt> | Constituting system for communicating network thru light fiber cable |
| JPS57132440A (en) * | 1981-02-09 | 1982-08-16 | Toshiba Corp | Annular optical communication system |
-
1984
- 1984-01-30 JP JP59014687A patent/JPS60158742A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS531404A (en) * | 1976-06-28 | 1978-01-09 | Nippon Telegr & Teleph Corp <Ntt> | Constituting system for communicating network thru light fiber cable |
| JPS57132440A (en) * | 1981-02-09 | 1982-08-16 | Toshiba Corp | Annular optical communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60158742A (en) | 1985-08-20 |
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