JPS60121833A - Two-way optical transmission system - Google Patents
Two-way optical transmission systemInfo
- Publication number
- JPS60121833A JPS60121833A JP58229057A JP22905783A JPS60121833A JP S60121833 A JPS60121833 A JP S60121833A JP 58229057 A JP58229057 A JP 58229057A JP 22905783 A JP22905783 A JP 22905783A JP S60121833 A JPS60121833 A JP S60121833A
- Authority
- JP
- Japan
- Prior art keywords
- optical
- station
- modulated
- signal
- information
- 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.)
- Pending
Links
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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2587—Arrangements specific to fibre transmission using a single light source for multiple stations
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、光ファイバを伝送路として双方向に光信号を
伝送する方式に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a system for bidirectionally transmitting optical signals using an optical fiber as a transmission path.
従来、光ファイバを用いて双方向に光を伝送する方式と
して、光送信器、光ファイバおよび光受信器を対向局側
にそれぞれ一式ずつ用いる方法や、波長多重方式により
それぞれの方向の伝送用として１波長ずつ用いる方法な
どが採用されていた。Conventionally, methods for transmitting light in both directions using optical fibers include methods that use one set each of an optical transmitter, optical fiber, and optical receiver on the opposite station side, and methods that use wavelength multiplexing for transmission in each direction. A method using one wavelength at a time was used.
しかし乍ら、上記の方法はいずれも２台の光送信器、す
なわち、２つの光源を備えねばならず、その光源として
発光ダイオード、またはレーザダイオードを２個必要と
した。したがって。However, all of the above methods require two optical transmitters, that is, two light sources, and require two light emitting diodes or laser diodes as the light sources. therefore.
システムの経済性および信頼性が単一方向伝送の場合に
比べて低下するという欠点があった。。The disadvantage is that the economy and reliability of the system are lower than in the case of unidirectional transmission. .
更に、後者の方法においては、光源として使用される発
光ダイオード、またはレーザダイオードの発光中心波長
を２波間で干渉しないように選ばねばならないという制
約があった。Furthermore, in the latter method, there is a restriction that the emission center wavelength of the light emitting diode or laser diode used as the light source must be selected so as not to cause interference between the two waves.
本発明の目的は、対向局から送られてきた被変調光信号
を受けて、これを２分岐し２分岐出力の一力から変調情
報を得るとともに１分岐出力の他方に新たに変調をかけ
て送り返えすことによって、１つの光？Ｄｊ−ｋ使用す
るのみで双方向に光信号を伝送することのできる経済的
、かつ信頼性の高い双方向光伝送方式を提供することに
ある。The object of the present invention is to receive a modulated optical signal sent from the opposite station, split it into two, obtain modulation information from one of the outputs of the two branches, and apply new modulation to the other output of the first branch. By sending back a light? It is an object of the present invention to provide an economical and highly reliable bidirectional optical transmission system capable of bidirectionally transmitting optical signals only by using Dj-k.
本発明によれば、第１の局側に、伝送すべき情報により
変調された光信号を送出する）し送信器と、第２の局側
から光伝送路を介して送られてきた光信号を受信し、伝
送されてきた変調情報に復調する第１の光受信器とを備
え、第２０〕局側に、前記第１の局の光送信器から光伝
送路を介して送られてきた光信号を２つに分岐する手段
と、該分岐手段の一方の出力光信号を受け。According to the present invention, a transmitter transmits an optical signal modulated by information to be transmitted to a first station, and an optical signal sent from a second station via an optical transmission line. and a first optical receiver that receives and demodulates the transmitted modulated information, and transmits the transmitted information from the optical transmitter of the first station to the 20th station via the optical transmission line. means for branching an optical signal into two; and receiving an output optical signal from one of the branching means.
伝送されてきた変調情報にｔＵ調する第２の光受信器と
、前記分岐手段の他方の出力光信号を受け、該光信号を
Ａｉｌ記第１の局へ伝送すべき情報により変調して光伝
送路へ送出する光変調器とを備えたことを特徴とする双
方向光伝送方式が得られる。A second optical receiver modulates the transmitted modulation information and receives the output optical signal from the other branching means, modulates the optical signal with the information to be transmitted to the first station, and outputs an optical signal. A bidirectional optical transmission system is obtained, which is characterized in that it includes an optical modulator that sends out data to a transmission path.
次に９本発明による双方向光伝送方式について実施例を
挙げ２図面を参照して説明する。Next, a bidirectional optical transmission system according to the present invention will be described with reference to two embodiments and two drawings.
第１図は本発明による第１の実施例の構成をフロック図
により示したものである。まず、Ａ局側において、入力
端子１に乃えしれた変調入力信号は光送信器２に加えら
れ、ここで光信号に変換される。この光信号は光ファイ
バ３ａの伝送路をとおってＢ局側に送られる。Ｂ局にお
いて、光ファイバ６ａからうけた光信号は光分岐器４に
勺えられ、ここで２分岐される。分岐出力の１つは光フ
ァイバ６ｂを介して光受信器５へ。FIG. 1 is a block diagram showing the configuration of a first embodiment of the present invention. First, on the A station side, a modulated input signal sent to input terminal 1 is applied to optical transmitter 2, where it is converted into an optical signal. This optical signal is sent to the B station side through the transmission line of the optical fiber 3a. At the B station, the optical signal received from the optical fiber 6a is sent to the optical splitter 4, where it is split into two. One of the branched outputs is sent to the optical receiver 5 via the optical fiber 6b.
訓
他の分岐出力は光ファイバ３ｃを介して光変換′器８へ
それぞれ加えられる。光受信器５へ加えられた光信号は
、ここで原電気信号に変換され。The other branched outputs are respectively applied to the optical converter 8 via the optical fiber 3c. The optical signal applied to the optical receiver 5 is converted here into an original electrical signal.
光
出力端子６から導出される。他方、゛声変調器８にＩｊ
えられた光信号は、入力端子７から加えられる変調入力
信号によって変調さ杆、光ファイバ３ｄの伝送路を通っ
てＡ局側に送られる。再びＡ局において、光ファイバ６
ｄを介して送られてきた光信号は光受信器９により受け
られ。It is led out from the optical output terminal 6. On the other hand, Ij is applied to the voice modulator 8.
The obtained optical signal is modulated by a modulated input signal applied from the input terminal 7 and sent to the A station side through the transmission line of the optical fiber 3d. Again at station A, optical fiber 6
The optical signal sent via d is received by the optical receiver 9.
ここでＢ局において与えられた変調信号のみが復調され
て、出力端子１０に導出される。なお。Here, only the modulated signal given at the B station is demodulated and output to the output terminal 10. In addition.
この例においては、Ａ局の入力端子１にはアナログ情報
が加えられ、他方、Ｂ局の入力端子７にはディジタル情
報が加えられる。そして、このディジタル情報のビット
周期は、アナログ情報の≠→毒鰯寺周期に比べて長く選
定されている。したがって、Ｂ局の光変調器８において
。In this example, analog information is applied to the input terminal 1 of the A station, while digital information is applied to the input terminal 7 of the B station. The bit period of this digital information is selected to be longer than the period of the analog information. Therefore, in the optical modulator 8 of the B station.
光分岐器４からの光信号がアナログ値で変調されていて
も、新たに変調のかけられるディジタル値、すなわちビ
ット周期の長い′°０′”および１”の変化をＡ局の光
受信器９で検出するのに何等困ｔ、ｌｆを生じない。Even if the optical signal from the optical splitter 4 is modulated with an analog value, the optical receiver 9 of the A station receives the newly modulated digital value, that is, changes in the long bit period '0' and 1'. There is no problem in detecting t and lf.
第２図は本発明による第２の実施例の構成をソロツク図
により示したものである。この例は。FIG. 2 is a solo diagram showing the structure of a second embodiment of the present invention. This example is.
Ａ局とＢ局との間を結ぶ伝送路として１本の光ファイバ
１３ｂを用いて双方向の光伝送を可能にするために、方
向性光結合器１１および１２が追加されている点に第１
図の実施例との相違があるが、その他の機能については
本１７ｉ的に変りがない。図において、Ａ局の方向性光
結合器１１は、光送信器２から光ファイバ１３ａを介し
て送られてきた光信号を光ファイバ１６１〕の伝送路へ
送り、逆方向から送られてきたＢ局の光信号を光ファイ
バ１３ｇを介して光受信器９へ送る。また、Ｂ局の方向
性光結合器１２は、光ファイバ１３ｂから伝送されてき
た光信号を光ファイバ１３ｃを介して光分岐器４に送り
、光変調器８から光ファイバ１３ｆを介して送られてき
た光信号を光ファイバ１３ｂの伝送路へ送る役目をして
いる。The third point is that directional optical couplers 11 and 12 are added to enable bidirectional optical transmission using one optical fiber 13b as a transmission line connecting stations A and B. 1
Although there are some differences from the embodiment shown in the figure, other functions are the same as in this 17i. In the figure, the directional optical coupler 11 of the A station sends the optical signal sent from the optical transmitter 2 via the optical fiber 13a to the transmission line of the optical fiber 161], and sends the optical signal sent from the opposite direction to the optical fiber 161. The optical signal of the station is sent to the optical receiver 9 via the optical fiber 13g. In addition, the directional optical coupler 12 of the B station sends the optical signal transmitted from the optical fiber 13b to the optical splitter 4 via the optical fiber 13c, and sends the optical signal from the optical modulator 8 via the optical fiber 13f. It serves to send the received optical signal to the transmission line of the optical fiber 13b.
なお、Ｌ口笛１および第２の実施例において。Note that in the L whistle 1 and the second embodiment.
Ｂ局の入力端子７に加えられるディジタル信号がＡ局側
の入力信号に比べてより低速の場合には、光変調器８と
して光スィッチを用いることができる。If the digital signal applied to the input terminal 7 of the B station is slower than the input signal of the A station, an optical switch can be used as the optical modulator 8.
以」二の説明により明らかなように２本発明によれば、
対向局から送られてきた被変Ｎ、１１光信号を受けて、
これを２分岐し５分岐出力の一方から変調情報をイＳる
とともに２分岐出力の他方に新たに変調をかけて送り返
えすことによって。As is clear from the following explanation, according to the present invention,
Upon receiving the modified N, 11 optical signal sent from the opposite station,
By branching this into two, outputting modulation information from one of the five branch outputs, and applying new modulation to the other of the two branch outputs and sending it back.
システム全体として光源の発光ダイオード、またはレー
ザダイオードを唯１個備えるだけでよいから、光源の発
光波長の選定に制約がないことは勿論、経済性および信
頼性の向上が得られる点においてその効果は大きい。Since the entire system only needs to have one light emitting diode or laser diode as a light source, there are no restrictions on the selection of the emission wavelength of the light source, and the effect is that it improves economic efficiency and reliability. big.
第１図は本発明による第１の実施例の構成を示すブロッ
ク図、第２図は本発明による第２の実施例の構成を示す
ブロック図である。
図において、２は光送信器、３ａ、 ３ｂ、 ３ｃ、
３ｄ。
１３ａ、 １３ｂ、 １３ｃ、 １３ｄ−、１３ｅ、
１３ｆ、 １３ｇは光ファイバ、４は光分岐器、５，９
は光受信器、８は光変調器、１１．１２は方向性光結合
器である。FIG. 1 is a block diagram showing the configuration of a first embodiment according to the present invention, and FIG. 2 is a block diagram showing the configuration of a second embodiment according to the present invention. In the figure, 2 is an optical transmitter, 3a, 3b, 3c,
3d. 13a, 13b, 13c, 13d-, 13e,
13f, 13g are optical fibers, 4 is an optical splitter, 5, 9
8 is an optical receiver, 8 is an optical modulator, and 11.12 is a directional optical coupler.
Claims (1)
号を送出する光送信器と、第２の局側から光伝送路を介
して送られてきた光信号を受信し、伝送されてきた変調
情報に復調する第１の光受信器とを備え、第２の局側に
、前記第１の局の光送信器から光伝送路を介して送られ
てきた光信号を２つに分岐する手段と、該分岐手段の一
方の出力）し信号を受け、伝送されてきた変調情報（−
復調する第２の光受信器と、前記分岐手段の他方の出力
光信号全受け、該光信号を前記第１の局へ伝送すべき情
報により変調して光伝送路へ送出する光変調器とを備え
たことを特徴とする双方向光伝送方式。1. An optical transmitter that sends an optical signal modulated by the information to be transmitted to the first station side, and an optical transmitter that receives the optical signal sent from the second station side via the optical transmission line, and transmits the optical signal. a first optical receiver that demodulates the received modulation information; means for branching, and one output of the branching means), receives the signal, and modulates the transmitted modulation information (-
a second optical receiver that demodulates; an optical modulator that receives all the output optical signals from the other of the branching means; modulates the optical signals with information to be transmitted to the first station; and sends the modulated optical signals to the optical transmission line; A bidirectional optical transmission system characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58229057A JPS60121833A (en) | 1983-12-06 | 1983-12-06 | Two-way optical transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58229057A JPS60121833A (en) | 1983-12-06 | 1983-12-06 | Two-way optical transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60121833A true JPS60121833A (en) | 1985-06-29 |
Family
ID=16886063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58229057A Pending JPS60121833A (en) | 1983-12-06 | 1983-12-06 | Two-way optical transmission system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60121833A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63148726A (en) * | 1986-12-12 | 1988-06-21 | Nec Corp | Wavelength-division multiplex bidirectional optical communication equipment |
| JPH02202732A (en) * | 1989-01-31 | 1990-08-10 | Nec Corp | Optical signal transmission equipment |
| EP0615358A1 (en) * | 1993-03-11 | 1994-09-14 | AT&T Corp. | Optical network based on remote interrogation of terminal equipment |
| JP2005333311A (en) * | 2004-05-19 | 2005-12-02 | Chugoku Electric Power Co Inc:The | Fault recovery method in two-core two-way communication network |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5329003A (en) * | 1976-08-30 | 1978-03-17 | Nec Corp | Optical fiber trans mission system |
| JPS5668039A (en) * | 1979-11-08 | 1981-06-08 | Fuji Electric Co Ltd | Two-way light communication system |
-
1983
- 1983-12-06 JP JP58229057A patent/JPS60121833A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5329003A (en) * | 1976-08-30 | 1978-03-17 | Nec Corp | Optical fiber trans mission system |
| JPS5668039A (en) * | 1979-11-08 | 1981-06-08 | Fuji Electric Co Ltd | Two-way light communication system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63148726A (en) * | 1986-12-12 | 1988-06-21 | Nec Corp | Wavelength-division multiplex bidirectional optical communication equipment |
| JPH02202732A (en) * | 1989-01-31 | 1990-08-10 | Nec Corp | Optical signal transmission equipment |
| EP0615358A1 (en) * | 1993-03-11 | 1994-09-14 | AT&T Corp. | Optical network based on remote interrogation of terminal equipment |
| JP2005333311A (en) * | 2004-05-19 | 2005-12-02 | Chugoku Electric Power Co Inc:The | Fault recovery method in two-core two-way communication network |
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