JP2578788B2 - 1-fiber bidirectional time division optical transmission device - Google Patents
1-fiber bidirectional time division optical transmission deviceInfo
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- JP2578788B2 JP2578788B2 JP62000274A JP27487A JP2578788B2 JP 2578788 B2 JP2578788 B2 JP 2578788B2 JP 62000274 A JP62000274 A JP 62000274A JP 27487 A JP27487 A JP 27487A JP 2578788 B2 JP2578788 B2 JP 2578788B2
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- optical
- signal
- electric signal
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Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、１心光ファイバを用いて光信号を時分割で
双方向伝送する１心双方向時分割光伝送装置に関するも
のである。Description: TECHNICAL FIELD The present invention relates to a single-fiber bidirectional time-division optical transmission device for transmitting a bidirectional optical signal in a time-division manner using a single-fiber optical fiber.
（従来の技術） 従来、このような分野の技術としては、大原省爾、木
村達也編著「電気・電子工学大系 73 光通信」初版
（昭56−11−30）コロナ社、P164−168、及び昭和59年
度電子通信学会総合全国大会、田村安昭他「2656 発
光，受光素子内蔵型双方向伝送用合分波器」P.10−356
に記載されるものがあった。以下、この構成を図を用い
て説明する。(Prior art) Conventionally, technologies in such a field include the first edition of "Electrical and Electronic Engineering University 73 Optical Communication", edited by Shoji Ohara and Tatsuya Kimura (Showa 56-11-30), Corona, P164-168, And 1984 IEICE General Conference, Yasuaki Tamura et al. “2656 Multi-demultiplexer for bidirectional transmission with built-in light-emitting and light-receiving elements” P.10-356
There was what was described in. Hereinafter, this configuration will be described with reference to the drawings.
第２図は従来の光伝送装置の構成例とその使用例を示
す光伝送システム図である。この光伝送システムは第１
と第２の光伝送装置１−1,1−２を備え、その両光伝送
装置１−1,1−２が１心光ファイバ２で相互に接続され
ている。第１の光伝送装置１−１は、入力電気信号Sia
を波長λ１の光信号に変換する電気／光変換器（E/O）1
0−１、波長λ２の光信号を出力電気信号Soaに変換する
光／電気変換器（O/E）11−１、及び波長λ1,λ２の光
信号の合波と分波を行う光合分波器12−１で構成されて
いる。同様に第２の光伝送装置１−２は、入力電気信号
Sibを波長λ２の光信号に変換する電気／光変換器（E/
O）10−２、波長λ１の光信号を出力電気信号Sobに変換
する光／電気変換器（O/E）11−２、及び波長λ1,λ２
の光信号の合波と分波を行う光合分波器12−２で構成さ
れている。FIG. 2 is an optical transmission system diagram showing a configuration example of a conventional optical transmission device and an example of its use. This optical transmission system is the first
And a second optical transmission device 1-1, 1-2. The two optical transmission devices 1-1, 1-2 are connected to each other by a single optical fiber 2. The first optical transmission device 1-1 receives the input electric signal Sia
/ E converter (E / O) 1 that converts λ1 into an optical signal of wavelength λ1
0-1, an optical / electrical converter (O / E) 11-1 for converting an optical signal of wavelength λ2 into an output electrical signal Soa, and an optical multiplexing / demultiplexing device for multiplexing and demultiplexing optical signals of wavelengths λ1, λ2 It is composed of a device 12-1. Similarly, the second optical transmission device 1-2 receives the input electric signal.
An electrical / optical converter (E / E) that converts Sib into an optical signal of wavelength λ2
O) 10-2, an optical / electrical converter (O / E) 11-2 for converting an optical signal of wavelength λ1 into an output electric signal Sob, and wavelengths λ1, λ2
And an optical multiplexer / demultiplexer 12-2 for multiplexing and demultiplexing the optical signals.
以上の構成において、第１の光伝送装置１−１に入力
電気信号Siaが供給されると、その入力電気信号Siaは電
気／光変換器10−１で波長λ１の光信号に変換され、そ
れが光合分波器12−１及び光ファイバ２を通して第２の
光伝送装置１−２側へ伝送される。第２の光伝送装置１
−２側へ伝送された波長λ１の光信号は光／電気変換器
11−２で電気信号に変換され、それが出力電気信号Sob
の形で出力される。また、第２の光伝送装置１−２に入
力電気信号Sibが供給されると、その入力電気信号Sibは
電気／光変換器10−２で波長λ２の光信号に変換され、
それが光合分波器12−２及び光ファイバ２を通して第１
の光伝送装置１−１側へ伝送され、その光合分波器12−
１を通して光／電気変換器11−１で出力電気信号Soaに
変換され、出力される。このように１本の光ファイバ２
を用いて波長λ1,λ２の２波多重双方向伝送を行ってい
た。In the above configuration, when the input electric signal Sia is supplied to the first optical transmission device 1-1, the input electric signal Sia is converted into an optical signal of the wavelength λ1 by the electric / optical converter 10-1. Is transmitted to the second optical transmission device 1-2 through the optical multiplexer / demultiplexer 12-1 and the optical fiber 2. Second optical transmission device 1
The optical signal of wavelength λ1 transmitted to the -2 side is an optical / electrical converter.
It is converted into an electric signal in 11-2, and it is output electric signal Sob.
Is output in the form Further, when the input electric signal Sib is supplied to the second optical transmission device 1-2, the input electric signal Sib is converted into an optical signal of the wavelength λ2 by the electric / optical converter 10-2,
It is first transmitted through the optical multiplexer / demultiplexer 12-2 and the optical fiber 2.
Is transmitted to the optical transmission device 1-1 side, and the optical multiplexer / demultiplexer 12-
1 and converted into an output electric signal Soa by an optical / electrical converter 11-1 and output. Thus, one optical fiber 2
To perform two-wave multiplex bidirectional transmission of wavelengths λ1 and λ2.
（発明が解決しようとする問題点） しかしながら、上記構成の装置では、第１の光伝送装
置１−１の送信光波長がλ１であり、第２の光伝送装置
１−２の送信光波長がλ２であってそれぞれの波長が異
なるため、第１と第２の光伝送装置１−1,1−２間には
互換性がなく、不利不便である。(Problems to be solved by the invention) However, in the device having the above configuration, the transmission light wavelength of the first optical transmission device 1-1 is λ1, and the transmission light wavelength of the second optical transmission device 1-2 is λ1. Since it is λ2 and the wavelengths are different, there is no compatibility between the first and second optical transmission devices 1-1 and 1-2, which is disadvantageous.
また、光ファイバ２の伝送距離によって伝送遅延時間
に変動があるので、伝送距離の大小に関わらず、同一の
バースト繰返し周期で信号の処理を行うことが難しく、
これを実現しようとすると、装置の構成が複雑化する。
しかも、光信号のデータ伝送速度は、電気信号の倍以上
あるので、電気信号を連続的に取り扱うことが難しいと
いった問題点もある。In addition, since the transmission delay time varies depending on the transmission distance of the optical fiber 2, it is difficult to perform signal processing at the same burst repetition cycle regardless of the transmission distance.
To achieve this, the configuration of the device becomes complicated.
In addition, since the data transmission speed of the optical signal is twice or more that of the electric signal, there is a problem that it is difficult to handle the electric signal continuously.
本発明は、前記従来技術が持っていた問題点を解決
し、互換性があり、装置の構成が簡単で、電気信号を連
続的に取り扱うことができる１心双方向時分割光伝送装
置を提供するものである。The present invention solves the problems of the prior art, provides a single-fiber bidirectional time-division optical transmission device that is compatible, has a simple configuration, and can continuously handle electric signals. Is what you do.
（問題点を解決するための手段） 本発明は、前記問題点を解決するために、１心光ファ
イバを用いて光信号の双方向伝送を行う１心双方向時分
割光伝送装置において、連続した入力電気信号を、電気
信号の伝送速度に対応した第１の速度で蓄積し、この蓄
積した入力電気信号を、光信号の伝送速度に対応した第
２の速度で読出してバースト状の送信電気信号を出力す
る第１のメモリと、バースト状の受信電気信号を前記第
２の速度で蓄積し、この蓄積した受信電気信号を前記第
１の速度で読出して連続した出力電気信号を出力する第
２のメモリと、前記送信電気信号をバースト状の送信光
信号に変換する電気／光変換器と、１心光ファイバから
のバースト状の受信光信号を前記受信電気信号に変換す
る光／電気変換器とを、備えている。(Means for Solving the Problems) In order to solve the above problems, the present invention provides a single-fiber bidirectional time-division optical transmission apparatus for performing bidirectional transmission of an optical signal using a single-fiber optical fiber. The stored input electric signal is stored at a first speed corresponding to the transmission speed of the electric signal, and the stored input electric signal is read at a second speed corresponding to the transmission speed of the optical signal to transmit the burst-like transmission electric signal. A first memory for outputting a signal; a second memory for accumulating a burst-like received electric signal at the second speed; reading the accumulated received electric signal at the first speed to output a continuous output electric signal; 2, an electrical / optical converter for converting the transmission electric signal into a burst transmission optical signal, and an optical / electric conversion for converting a burst reception optical signal from a single-core optical fiber into the reception electric signal. And a container.
さらに、前記送信光信号を前記光ファイバへ送出しか
つ前記光ファイバからの受信光信号を前記光／電気変換
器へ与える光信号振分け手段と、前記第１および第２の
メモリの書込みおよび読出しを時分割で制御し、伝送遅
延時間の変動をガード時間の増減により補償して、所定
のバースト繰返し周期で前記送信光信号および前記受信
光信号の伝送を行わせる制御回路とが、設けられてい
る。An optical signal distributing means for transmitting the transmission optical signal to the optical fiber and supplying a reception optical signal from the optical fiber to the optical / electrical converter; and for writing and reading the first and second memories. A control circuit that controls the transmission optical signal and the received optical signal in a predetermined burst repetition cycle by controlling in a time-division manner, compensating for the fluctuation of the transmission delay time by increasing or decreasing the guard time. .
（作 用） 本発明によれば、以上のように１心双方向時分割光伝
送装置を構成したので、連続した入力電気信号が供給さ
れると、この入力電気信号が、所定のバースト繰返し周
期の間に第１のメモリに蓄積される。第１のメモリに蓄
積された入力電気信号は、所定の時間内に第２の速度
（例えば、倍以上の速度）で読出され、バースト状の送
信電気信号として出力される。この送信電気信号は、電
気／光変換器でバースト状の送信光信号に変換され、光
信号振分け手段で振分けられて１心光ファイバへ送出さ
れる。また、１心光ファイバから送られてきたバースト
状の受信光信号は、信号振分け手段で振分けられ、光／
電気変換器でバースト状の受信電気信号に変換される。
この受信電気信号は、第２のメモリに蓄積されて一定時
間後に第１の速度（例えば、通常の速度）で読出され、
連続した出力電気信号として出力される。これにより、
伝送遅延時間の変動がガード時間の増減によって補償さ
れ、伝送距離によらず、所定のバースト繰返し周期で光
信号の伝送が行える。(Operation) According to the present invention, as described above, the single-fiber bidirectional time-division optical transmission device is configured. When a continuous input electric signal is supplied, the input electric signal becomes a predetermined burst repetition cycle. Is stored in the first memory. The input electric signal stored in the first memory is read at a second speed (for example, twice or more) within a predetermined time, and is output as a burst-like transmission electric signal. The transmission electric signal is converted into a burst transmission optical signal by an electric / optical converter, distributed by an optical signal distribution unit, and transmitted to a single-core optical fiber. Further, a burst-like received optical signal sent from the single-core optical fiber is distributed by the signal distribution means,
It is converted into a received electrical signal in a burst by an electrical converter.
The received electric signal is stored in the second memory and is read out at a first speed (for example, a normal speed) after a predetermined time,
It is output as a continuous output electric signal. This allows
Fluctuations in the transmission delay time are compensated for by the increase and decrease in the guard time, so that the optical signal can be transmitted at a predetermined burst repetition cycle regardless of the transmission distance.
（実施例） 第１図（１），（２）は本発明の実施例に係る１心双
方向時分割光伝送装置の構成およびその使用例を示す光
伝送システム図であり、同図（１）は光信号Oaを右方向
へ、同図（２）は光信号Obを左方向へそれぞれ伝送する
伝送システム図である。(Embodiment) FIGS. 1 (1) and 1 (2) are optical transmission system diagrams showing a configuration of a single-fiber bidirectional time-division optical transmission apparatus according to an embodiment of the present invention and an example of its use. 2) is a transmission system diagram for transmitting the optical signal Oa to the right and FIG. 2B is a transmission system diagram for transmitting the optical signal Ob to the left.
第１図（１）において、１心双方向時分割光伝送装置
20−１は１心光ファイバ21に接続されるもので、バッフ
ァメモリ等で構成される第1,第２のメモリ（Ｍ）30−1,
31−１と、そのメモリ30−1,31−１の書込みおよび読出
し等を時分割で制御する制御回路（CONT）32−１とを備
えている。第１のメモリ30−１は入力電気信号Siaを格
納し送信電気信号を出力するメモリ、第２のメモリ31−
１は受信電気信号を格納し、出力電気信号Soaを出力す
るメモリであり、その第１のメモリ30−１の出力側に電
気／光変換器（E/O）33−１が、その第２のメモリ31−
１のの入力側に光／電気変換器（O/E）34−１がそれぞ
れ接続されている。電気／光変換器33−１は送信電気信
号を送信光信号Oaに変換するもの、光／電気変換器34−
１は受信光信号Obを受信電気信号に変換するものであ
り、その電気／光変換器33−１の出力側が光スイッチ35
−１の端子35−1aに、その光／電気変換器34−１の入力
側が光スイッチ35−１の端子35−1bにそれぞれ接続され
ている。光スイッチ35−１は端子35−1a・35−1c間光路
と端子35−1b・35−1c間光路を制御回路32−１からの制
御信号により切換えるもので、その端子35−1cには光フ
ァイバ21が接続される。In FIG. 1 (1), one-fiber bidirectional time-division optical transmission device
20-1 is connected to the one-core optical fiber 21, and includes first and second memories (M) 30-1 and
31-1 and a control circuit (CONT) 32-1 for controlling writing and reading of the memories 30-1 and 31-1 in a time sharing manner. The first memory 30-1 stores the input electric signal Sia and outputs the transmission electric signal, and the second memory 31-
Reference numeral 1 denotes a memory for storing a received electric signal and outputting an output electric signal Soa. An electric / optical converter (E / O) 33-1 is provided on the output side of the first memory 30-1. Memory 31-
An optical / electrical converter (O / E) 34-1 is connected to the input side of each of them. The electric / optical converter 33-1 converts the transmission electric signal into the transmission optical signal Oa, and the optical / electric converter 34-1.
Numeral 1 is for converting the received optical signal Ob into a received electric signal, and the output side of the electric / optical converter 33-1 is connected to the optical switch 35.
The input side of the optical / electrical converter 34-1 is connected to the terminal 35-1b of the optical switch 35-1. The optical switch 35-1 switches an optical path between the terminals 35-1a and 35-1c and an optical path between the terminals 35-1b and 35-1c by a control signal from the control circuit 32-1. The fiber 21 is connected.
以上のような光伝送装置20−１を用いて双方向光伝送
システムを構成する場合、その光伝送装置20−１と同一
構造の光伝送装置20−２を光ファイバ21に接続する。こ
の光伝送装置20−２は、入力電気信号Sibを格納する第
１のメモリ（Ｍ）30−２、出力電気信号Sobを出力する
第２のメモリ（Ｍ）31−２、制御回路（CONT）32−２、
送信光信号Obを出力する電気／光変換器（E/O）33−
２、及び端子35−2a,35−2b,35−2cを有する光スイッチ
35−２で構成されている。When a bidirectional optical transmission system is configured using the optical transmission device 20-1 as described above, an optical transmission device 20-2 having the same structure as the optical transmission device 20-1 is connected to the optical fiber 21. The optical transmission device 20-2 includes a first memory (M) 30-2 for storing an input electric signal Sib, a second memory (M) 31-2 for outputting an output electric signal Sob, and a control circuit (CONT). 32-2,
An electrical / optical converter (E / O) 33- that outputs the transmission optical signal Ob
2, and an optical switch having terminals 35-2a, 35-2b, and 35-2c
35-2.
第１図（２）は第１図（１）と同一の双方向光伝送シ
ステムの構成図であり、光伝送装置20−２から光伝送装
置20−１へ光信号Obを伝送する例が示されている。FIG. 1 (2) is a configuration diagram of the same bidirectional optical transmission system as FIG. 1 (1), showing an example of transmitting an optical signal Ob from the optical transmission device 20-2 to the optical transmission device 20-1. Have been.
第３図は第１図中の光伝送装置20−1,20−２のうち、
例えば一方の光伝送装置20−１の実装例を示す斜視図で
ある。この光伝送装置20−１は、第1,第２のメモリ30−
1,31−１、制御回路32−１、電気／光変換器33−１、光
／電気変換器34−１、及び光スイッチ35−１が光電子集
積回路（以下、OEICという）で構成され、それらが基板
40上に形成されている。FIG. 3 shows one of the optical transmission devices 20-1 and 20-2 in FIG.
For example, it is a perspective view showing a mounting example of one optical transmission device 20-1. This optical transmission device 20-1 includes first and second memories 30-
1, 31-1, a control circuit 32-1, an electrical / optical converter 33-1, an optical / electrical converter 34-1 and an optical switch 35-1 are configured by an optoelectronic integrated circuit (hereinafter referred to as OEIC), They are substrates
Formed on 40.
第４図（１），（２），（３）は第１図の動作説明図
であって、同図（１），（２），（３）は光ファイバ21
の伝送距離による遅延時間Tf1,Tf2,Tf3の差を示してい
る。なお第４図中、Ｔはバースト繰返し周期、Taは光信
号Oaの送出時間、Tbは光信号Obの送出時間、Tg1,Tg2,Tg
3,Tg4,Tg5,Tg61,Tg62,Tg63は光スイッチ35−1,35−２の
動作および信号送受信のためのガード時間である。4 (1), (2) and (3) are explanatory diagrams of the operation of FIG. 1, and FIGS. 4 (1), (2) and (3) show the optical fiber 21.
Shows the difference between the delay times Tf1, Tf2, and Tf3 due to the transmission distance. In FIG. 4, T is the burst repetition period, Ta is the transmission time of the optical signal Oa, Tb is the transmission time of the optical signal Ob, Tg1, Tg2, and Tg.
3, Tg4, Tg5, Tg61, Tg62, and Tg63 are guard times for operation of the optical switches 35-1 and 35-2 and signal transmission and reception.
第４図（１）を参照しつつ第１図（１）の動作を説明
する。The operation of FIG. 1 (1) will be described with reference to FIG. 4 (1).
一方の光伝送装置20−１の入力電気信号Siaは、バー
スト繰返し周期Ｔの間に第１のメモリ30−１に蓄積さ
れ、その蓄積された送信電気信号が時間Taの間に倍以上
の速度で読出され、電気／光変換器33−１で送信光信号
Oaに変換される。その光信号Oaは時間（Ta＋Tg1）の間
オン状態となる光スイッチ35−１の端子35−1a・35−1c
間を経由して光ファイバ21へ送出され、この光ファイバ
21の遅延時間Tf1後に他方の光伝送装置20−２に達す
る。他方の光伝送装置20−２へ伝送された光信号Oaは時
間（Tf1＋Ta＋Tg2）の間オン状態となる光スイッチ35−
２の35−2c・35−2b間を経由して光／電気変換器34−２
で受信電気信号に変換され、第２のメモリ31−２に蓄積
され、一定時間後に通常の速度で読出されて出力電気信
号Sobとして出力される。The input electric signal Sia of one optical transmission device 20-1 is accumulated in the first memory 30-1 during the burst repetition period T, and the accumulated transmission electric signal has a speed twice or more during the time Ta. And read by the electrical / optical converter 33-1.
Converted to Oa. The optical signal Oa is turned on for a time (Ta + Tg1). The terminals 35-1a and 35-1c of the optical switch 35-1 are turned on.
Is sent to the optical fiber 21 via the
After 21 delay times Tf1, the light reaches the other optical transmission device 20-2. The optical signal Oa transmitted to the other optical transmission device 20-2 is turned on for the time (Tf1 + Ta + Tg2).
Optical-to-electrical converter 34-2 via 2 between 35-2c and 35-2b
Is converted into a received electric signal, stored in the second memory 31-2, read out at a normal speed after a predetermined time, and output as an output electric signal Sob.
次に、第４（１）を参照しつつ第１図（２）の動作を
説明する。Next, the operation of FIG. 1 (2) will be described with reference to FIG. 4 (1).
他方の光伝送装置20−２の入力電気信号Sibは、第１
のメモリ30−２にバースト繰返し周期Ｔの間蓄積され、
その蓄積された送信電気信号が時間Tbの間に倍以上の速
度で読出され、電気／光変換器33−２で送信光信号Obに
変換される。その送信光信号Obは時間（Tg3＋Tb＋Tg4）
の間オン状態となる光スイッチ35−２の端子35−2a・35
−2c間を経由して光ファイバ21へ送出され、その光ファ
イバ21の遅延時間Tf1後に一方の光伝送装置20−１へ達
する。この光伝送装置20−１に達した光信号Obは、時間
（2Tf1−Tg1＋Tg2＋Tg3＋Tb＋Tg5）の間オン状態となる
光スイッチ35−１の端子35−1c・35−1b間を経由して光
／電気変換器34−１で受信電気信号に変換され、第２の
メモリ31−１に蓄積されて一定時間後に通常の速度で読
出され、出力電気信号Soaとして出力される。The input electric signal Sib of the other optical transmission device 20-2 is the first electric signal Sib.
Is stored in the memory 30-2 during the burst repetition period T,
The stored transmission electric signal is read out at twice or more the speed during the time Tb, and is converted into the transmission optical signal Ob by the electric / optical converter 33-2. The transmission optical signal Ob is time (Tg3 + Tb + Tg4)
Terminals 35-2a and 35 of the optical switch 35-2 which are turned on during the period
The signal is transmitted to the optical fiber 21 via the interval between −2c, and reaches one optical transmission device 20-1 after the delay time Tf1 of the optical fiber 21. The optical signal Ob arriving at the optical transmission device 20-1 passes through the terminals 35-1c and 35-1b of the optical switch 35-1 which is turned on for a time (2Tf1-Tg1 + Tg2 + Tg3 + Tb + Tg5). The signal is converted into a received electric signal by the device 34-1, stored in the second memory 31-1, read out at a normal speed after a predetermined time, and output as an output electric signal Soa.
以後同様の動作が繰り返され、各入力電気信号Sia,Si
bは一時的にバースト（bust）状の光信号Oa,Obに変換さ
れるが、対向する光伝送装置20−1,20−２で連続する出
力電気信号Sob,Soaとなる。Thereafter, the same operation is repeated, and each input electric signal Sia, Si
b is temporarily converted into burst optical signals Oa and Ob, but becomes continuous output electric signals Sob and Soa in the opposing optical transmission devices 20-1 and 20-2.
第４図（２）は光ファイバ21の遅延時間Tf2が第４図
（１）の遅延時間Tf1よりも長い場合の第１図（１），
（２）の動作状態が、第４図（３）は光ファイバ21の遅
延時間Tf3が第４図（２）の遅延時間Tf2よりも長い場合
の第１図（１），（２）の動作状態がそれぞれ示されて
いる。この第４図（２），（３）の動作は第４図（１）
とほぼ同様の動作となる。FIG. 4 (2) shows the case where the delay time Tf2 of the optical fiber 21 is longer than the delay time Tf1 of FIG. 4 (1).
4 (3) shows the operation of FIGS. 1 (1) and (2) when the delay time Tf3 of the optical fiber 21 is longer than the delay time Tf2 of FIG. 4 (2). Each state is shown. The operations of FIGS. 4 (2) and 3 (3) correspond to FIG. 4 (1)
Is almost the same operation.
本実施例では、次のような利点がある。 The present embodiment has the following advantages.
（ａ） 本実施例では、同一構造の２個の光伝送装置20
−1,20−２と１心光ファイバ21を用い、光スイッチ35−
1,35−２の信号振分け動作により、２つの光信号0a,0b
を双方向に時分割で伝送できるため、該光伝送装置20−
1,20−２は互換性を有し、１種類のものを用意すればよ
い。従って、使い勝手の向上と、システムの低コスト化
が可能となる。(A) In this embodiment, two optical transmission devices 20 having the same structure are used.
-1,20-2 and one-core optical fiber 21 and an optical switch 35-
By the signal distribution operation of 1,35-2, two optical signals 0a, 0b
Can be transmitted bidirectionally in a time-division manner.
1,20-2 have compatibility and only one kind may be prepared. Therefore, the usability can be improved and the cost of the system can be reduced.
（ｂ） 本実施例では、伝送遅延時間Tf1,Tf2,Tf3の変
動をガード時間Tg1,Tg2,Tg3,…の増減により補償して、
１心光ファイバ21の伝送距離によらず、所定のバースト
繰返し周期Ｔで光信号0a,0bの伝送を行うようになって
いる。そのため、伝送距離の大小に関わらず、同一のバ
ースト繰返し周期Ｔで信号の処理を行うことが可能とな
り、装置の構成が複雑化するのを避けることができる。
しかも、光信号0a,0bのデータ伝送速度は電気信号Sia,S
ib,Soa,Sobの倍以上であるが、メモリ30−1,30−2,31−
1,31−２を用いることによって、これらの電気信号Sia,
Sib,Soa,Sobを連続的に取り扱うことができる。(B) In the present embodiment, the fluctuation of the transmission delay time Tf1, Tf2, Tf3 is compensated by increasing or decreasing the guard time Tg1, Tg2, Tg3,.
The optical signals 0a and 0b are transmitted at a predetermined burst repetition period T regardless of the transmission distance of the one-core optical fiber 21. Therefore, regardless of the magnitude of the transmission distance, signal processing can be performed at the same burst repetition period T, and the configuration of the device can be prevented from becoming complicated.
In addition, the data transmission speed of the optical signals 0a and 0b is equal to the electrical signals Sia and S
ib, Soa, Sob, but more than twice, but memory 30-1, 30-2, 31-
1, 31-2, these electrical signals Sia,
Sib, Soa, Sob can be handled continuously.
（ｃ） 各光伝送装置20−1,20−２の構成要素をそれぞ
れ１つのモジュール内に収容すれば、これら各装置20−
1,20−２の小型化が図れる。しかも、光伝送装置20−1,
20−２を第３図のようにOEICで構成すれば、装置の小型
化が図れるばかりか、高精度化と低コスト化が可能とな
る。(C) If the components of each of the optical transmission devices 20-1 and 20-2 are accommodated in one module, respectively,
1,20-2 can be downsized. Moreover, the optical transmission device 20-1,
If the 20-2 is composed of the OEIC as shown in FIG. 3, not only the size of the device can be reduced, but also the accuracy and cost can be reduced.
第５図（１），（２）は本発明の他の実施例に係る１
心双方向時分割光伝送装置の構成およびその使用例を示
すもので、同図（１）は第１図（１）と同様に光信号Oa
を右方向へ伝送するシステム図、同図（２）は第１図
（２）と同様に光信号Obを左方向へ伝送するシステム図
である。FIGS. 5 (1) and (2) show one embodiment according to another embodiment of the present invention.
FIG. 1A shows the configuration of a two-way time-division optical transmission device and an example of its use. FIG. 1A shows an optical signal Oa similar to FIG. 1A.
FIG. 2B is a system diagram for transmitting the optical signal Ob to the left similarly to FIG. 1B.
第５図（１），（２）の１心双方向時分割光伝送装置
20−11,20−22は、第１図の光伝送装置20−1,20−２に
おける光スイッチ35−1,35−２に代えて光分岐結合器45
−1,45−２を設けた構成である。この光分岐結合器45−
1,45−２は、光スイッチ20−1,20−２と同様に入出力光
を光ファイバ21へ振分けるものであり、光信号の挿入損
失が光スイッチ20−1,20−２に比較して大きくなる欠点
がある反面、光スイッチ20−1,20−21のように切換制御
信号を必要としない利点を有している。このような光分
岐結合器45−1,45−２を用いても、上記実施例とほぼ同
様の作用、効果が得られる。5 (1), (2) 1-fiber bidirectional time division optical transmission device
20-11 and 20-22 are optical branching / combining units 45 instead of the optical switches 35-1 and 35-2 in the optical transmission devices 20-1 and 20-2 in FIG.
-1,45-2. This optical branching coupler 45-
1, 45-2 distributes input and output light to the optical fiber 21 in the same manner as the optical switches 20-1, 20-2, and the insertion loss of the optical signal is compared with that of the optical switches 20-1, 20-2. On the other hand, there is a disadvantage that the switching control signal is not required unlike the optical switches 20-1 and 20-21. Even when such optical branching couplers 45-1 and 45-2 are used, substantially the same operation and effect as in the above embodiment can be obtained.
（発明の効果） 以上詳細に説明したように、本発明によれば、光信号
振分け手段で入出力光を振分ける構成等にしたので、１
種類の光伝送装置を用いて１心光ファイバによる双方向
の時分割伝送が可能となり、しかも、この光伝送装置は
互換性を有するため、使い勝手の向上と低コスト化が期
待できる。(Effects of the Invention) As described in detail above, according to the present invention, the input / output light is distributed by the optical signal distribution means, and so on.
It is possible to perform bidirectional time-division transmission using a single-core optical fiber using various types of optical transmission devices, and since the optical transmission devices are compatible, improvement in usability and cost reduction can be expected.
さらに、本発明では、伝送遅延時間の変動をガード時
間の増減により補償して、１心光ファイバの伝送距離に
よらず、所定のバースト繰返し周期で光信号の伝送を行
うようになっている。そのため、伝送距離の大小に関わ
らず、同一のバースト繰返し周期で信号の処理を行うこ
とが可能となり、装置の構成が複雑化するのを避けるこ
とができる。しかも、光信号のデータ伝送速度は電気信
号の倍以上あるが、第1,第２のメモリを用いることによ
って、電気信号を連続的に取り扱うことができる。従っ
て、構成が簡単で、互換性があり、かつ信頼性の高い光
伝送装置を提供できる。Further, in the present invention, the fluctuation of the transmission delay time is compensated for by the increase and decrease of the guard time, and the optical signal is transmitted at a predetermined burst repetition cycle regardless of the transmission distance of the single optical fiber. Therefore, regardless of the magnitude of the transmission distance, signal processing can be performed at the same burst repetition period, and the configuration of the device can be prevented from becoming complicated. In addition, although the data transmission speed of the optical signal is twice or more that of the electric signal, the electric signal can be handled continuously by using the first and second memories. Therefore, it is possible to provide an optical transmission device having a simple configuration, compatibility, and high reliability.
第１図（１），（２）は本発明の実施例を示す１心双方
向時分割光伝送装置の構成および使用例を示す光伝送シ
ステム図、第２図は従来の光伝送装置の構成および使用
例を示す光伝送システム図、第３図は第１図における光
伝送装置の実装例を示す斜視図、第４図（１），
（２），（３）は第１図の動作説明図、第５図（１），
（２）は本発明の他の実施例を示す１心双方向時分割光
伝送装置の構成および使用例を示す光伝送システム図で
ある。 20−1,20−2,20−11,20−22……１心双方向時分割光伝
送装置、21……１心光ファイバ、30−1,30−2,31−1,31
−２……メモリ、32−1,32−２……制御回路、33−1,33
−２……電気／光変換器、34−1,34−２……光／電気変
換器、35−1,35−２……光スイッチ、45−1,45−２……
光分岐結合器、Sia,Sib……入力電気信号、Soa,Sob……
出力電気信号、Oa,Ob……光信号。FIGS. 1 (1) and 1 (2) are optical transmission system diagrams showing a configuration and an example of use of a one-fiber bidirectional time-division optical transmission device showing an embodiment of the present invention, and FIG. 2 is a configuration of a conventional optical transmission device. FIG. 3 is a perspective view showing an example of mounting the optical transmission device in FIG. 1, and FIG.
(2) and (3) are explanatory diagrams of the operation in FIG. 1, and FIG.
(2) is an optical transmission system diagram showing a configuration and a use example of a one-fiber bidirectional time-division optical transmission device showing another embodiment of the present invention. 20-1, 20-2, 20-11, 20-22 ... single-fiber bidirectional time-division optical transmission device, 21 ... single-fiber optical fiber, 30-1, 30-2, 31-1, 31
-2: Memory, 32-1, 32-2: Control circuit, 33-1, 33
-2 ... Electrical / optical converter, 34-1,34-2 ... Optical / electrical converter, 35-1,35-2 ... Optical switch, 45-1,45-2 ...
Optical branching coupler, Sia, Sib …… Input electric signal, Soa, Sob ……
Output electric signal, Oa, Ob ... optical signal.
Claims (4)
速度に対応した第１の速度で蓄積し、この蓄積した入力
電気信号を、光信号の伝送速度に対応した第２の速度で
読出してバースト状の送信電気信号を出力する第１のメ
モリと、 バースト状の受信電気信号を前記第２の速度で蓄積し、
この蓄積した受信電気信号を前記第１の速度で読出して
連続した出力電気信号を出力する第２のメモリと、 前記送信電気信号をバースト状の送信光信号に変換する
電気／光変換器と、 １心光ファイバからのバースト状の受信光信号を前記受
信電気信号に変換する光／電気変換器と、 前記送信光信号を前記光ファイバへ送出しかつ前記光フ
ァイバからの受信光信号を前記光／電気変換器へ与える
光信号振分け手段と、 前記第１および第２のメモリの書込みおよび読出しを時
分割で制御し、伝送遅延時間の変動をガード時間の増減
により補償して、所定のバースト繰返し周期で前記送信
光信号および前記受信光信号の伝送を行わせる制御回路
とを、備えたことを特徴とする１心双方向時分割光伝送
装置。An input electric signal is stored at a first speed corresponding to a transmission speed of an electric signal, and the stored input electric signal is read at a second speed corresponding to a transmission speed of an optical signal. A first memory for outputting a burst-like transmission electric signal, and storing a burst-like reception electric signal at the second speed;
A second memory that reads out the stored received electric signal at the first speed and outputs a continuous output electric signal, an electric / optical converter that converts the transmitted electric signal into a burst-shaped transmitted optical signal, An optical / electrical converter for converting a burst-like received optical signal from a single-core optical fiber into the received electric signal, transmitting the transmitted optical signal to the optical fiber, and transmitting a received optical signal from the optical fiber to the optical fiber An optical signal distributing means to be applied to the electric converter; and controlling writing and reading of the first and second memories in a time-division manner, compensating for fluctuations in the transmission delay time by increasing and decreasing the guard time, and performing predetermined burst repetition. A control circuit for transmitting the transmission optical signal and the reception optical signal in a periodical manner.
成した特許請求の範囲第１項記載の１心双方向時分割光
伝送装置。2. The one-fiber bidirectional time-division optical transmission device according to claim 1, wherein said optical signal distribution means is constituted by an optical switch.
構成した特許請求の範囲第１項記載の１心双方向時分割
光伝送装置。3. The single-fiber bidirectional time-division optical transmission device according to claim 1, wherein said optical signal distribution means comprises an optical branching coupler.
器、前記光／電気変換器、前記光信号振分け手段、およ
び前記制御回路を、光電子集積回路で構成した特許請求
の範囲第１項記載の１心双方向時分割光伝送装置。4. The apparatus according to claim 1, wherein said first and second memories, said electric / optical converter, said optical / electrical converter, said optical signal distribution means, and said control circuit are constituted by optoelectronic integrated circuits. 2. The one-core bidirectional time-division optical transmission device according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62000274A JP2578788B2 (en) | 1987-01-05 | 1987-01-05 | 1-fiber bidirectional time division optical transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62000274A JP2578788B2 (en) | 1987-01-05 | 1987-01-05 | 1-fiber bidirectional time division optical transmission device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63169133A JPS63169133A (en) | 1988-07-13 |
| JP2578788B2 true JP2578788B2 (en) | 1997-02-05 |
Family
ID=11469325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62000274A Expired - Fee Related JP2578788B2 (en) | 1987-01-05 | 1987-01-05 | 1-fiber bidirectional time division optical transmission device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2578788B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114513254B (en) * | 2021-12-31 | 2024-03-19 | 飞昂创新科技南通有限公司 | High-speed photoelectric transmission system capable of dynamically changing transmission direction and cable |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57201934A (en) * | 1981-06-05 | 1982-12-10 | Oki Electric Ind Co Ltd | Memory switching system of buffer circuit |
| JPS58144936U (en) * | 1982-03-25 | 1983-09-29 | 沖電気工業株式会社 | Optical prestophone type telephone |
| JPS60226235A (en) * | 1984-04-24 | 1985-11-11 | Nec Corp | Optical fiber communication system |
| JPS6189735A (en) * | 1984-10-08 | 1986-05-07 | Nippon Telegr & Teleph Corp <Ntt> | Time division direction control transmission system of optical communication system |
| JPS61107828A (en) * | 1984-10-31 | 1986-05-26 | Fujitsu Ltd | Two-way optical communication system |
-
1987
- 1987-01-05 JP JP62000274A patent/JP2578788B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63169133A (en) | 1988-07-13 |
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