JPS58223933A - Optical signal duplex transmission system - Google Patents

Optical signal duplex transmission system

Info

Publication number
JPS58223933A
JPS58223933A JP57107260A JP10726082A JPS58223933A JP S58223933 A JPS58223933 A JP S58223933A JP 57107260 A JP57107260 A JP 57107260A JP 10726082 A JP10726082 A JP 10726082A JP S58223933 A JPS58223933 A JP S58223933A
Authority
JP
Japan
Prior art keywords
optical signal
light emitting
optical
emitting diode
communication
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
Application number
JP57107260A
Other languages
Japanese (ja)
Inventor
Michio Hibi
道夫 日比
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP57107260A priority Critical patent/JPS58223933A/en
Publication of JPS58223933A publication Critical patent/JPS58223933A/en
Pending legal-status Critical Current

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
    • H04B10/50—Transmitters

Abstract

PURPOSE:To improve the reliability of communication, by performing the communication with a couple of signals comprising an optical signal modulated with information to be transmitted and an optical signal modulated with the polarity opposite thereto. CONSTITUTION:A transistor(TR)9 and a TR10 are switched alternately in response to the polarity of an input signal 1 and a light emitting diode 12 and a light, emitting diode 16 are modulated at the polarity opposite thereto and emit light respectively. This circuit uses a power being substantially invalid heat energy source and drives the light emitting diode at the opposite polarity and no power consumption is increasd. If an optical signal of different wavelength is required, it is attained by using a light emitting diode of different light emitting wavelength.

Description

【発明の詳細な説明】 （１）発明の技術分野 本発明は、電気信号を光信号に変換して、光フアイバケ
ーブルで伝送する光通信に関し、光信号の２重化により
、光通信システムの信頼性を向上させる方法、および、
２重化のための発光ダイオードの駆動方法に関するもの
である。Detailed Description of the Invention (1) Technical Field of the Invention The present invention relates to optical communication in which electrical signals are converted into optical signals and transmitted through optical fiber cables, and the present invention relates to optical communication in which electrical signals are converted into optical signals and transmitted through optical fiber cables. How to improve reliability, and
The present invention relates to a method for driving light emitting diodes for duplexing.

（２７技術の背景 光フアイバケーブル伝送方式による光通信は　１ｇ１４
〜１ｇ１ｌヘルツ程度の周波数の光１−１って通信を行
うものである。第１図に光フアイバケーブル伝送方式の
構成を示す。第１図において、１は、入力信号、２は、
発光素子の駆動回路、３は、発光素子、４は、光ファイ
バ、５は光フアイバケーブル、６は受光素子、７は信号
再生回路、８は出方信号である。(Background of 27 Technology Optical communication using optical fiber cable transmission method is 1g14
Light 1-1 with a frequency of ~1g1l hertz is used for communication. Figure 1 shows the configuration of the optical fiber cable transmission system. In FIG. 1, 1 is an input signal, 2 is
3 is a light emitting element, 4 is an optical fiber, 5 is an optical fiber cable, 6 is a light receiving element, 7 is a signal reproducing circuit, and 8 is an output signal.

発光素子３は、駆動回路２により、変調されて、入力信
号１の電気・光変換を行ない、光信号を作り出す。該光
信号は光ファイバ４の中を通って受信地点に達する。受
信側では、受光素子６にょシ、光・電気変換が行なわれ
、信号再生回路７により、出方信号８として再生される
。The light emitting element 3 is modulated by the drive circuit 2, performs electrical-to-optical conversion of the input signal 1, and produces an optical signal. The optical signal passes through the optical fiber 4 and reaches the receiving point. On the receiving side, the light-receiving element 6 performs optical-to-electrical conversion, and the signal reproducing circuit 7 reproduces the signal as an output signal 8.

（３）従来技術と問題点 光フアイバケーブルによる光通信の方式は、極めて低損
失な伝送が可能である、広帯域である、漏話がほとんど
無い、外部からの電磁誘導の影響が無い、光フアイバケ
ーブルが軽量である等の特徴を持っているが、その反面
、光ファイバが細径のガラスであるため、コネクタ等、
光関係部品の精度の保持が要求され、故障発生時の対処
が、従来の電線の場合のように、迅速には出来ない、等
の問題点がある。(3) Conventional technology and problems The optical communication method using optical fiber cable is capable of transmission with extremely low loss, has a wide band, has almost no crosstalk, and is not affected by external electromagnetic induction. Although it has characteristics such as being lightweight, on the other hand, since the optical fiber is made of thin glass, it is difficult to use connectors etc.
It is necessary to maintain the precision of optical-related components, and there are problems such as the fact that when a failure occurs, it cannot be dealt with as quickly as in the case of conventional electric wires.

また、発光素子として、発光ダイオードを使う場合、周
囲温度の影響を排し、安定な回路動作を得るため、差動
増幅器型電流切替回路により、発光ダイオードを駆動す
るのが普通である。第２図は、従来の差動増幅器型電流
切替回路による発光ダイオードの駆動回路を示したもの
で、９はトランジスタ１．１゜はトランジスタ２．１１
はトランジスタ１の負荷抵抗、１２は発光ダイオード、
１３位定電流回路、１４は電源入力、１５は基準電位（
・　　　３つアあ、０ 第２図において、トランジスタ１とトランジスタ２はエ
ミッタが共通の定電流回路１５で結ばれているので、ト
ランジスタ１とトランジスタ２は常に差動的に働き、入
力信号１によ５）ランジスタ２が導通した時、発光ダイ
オード１２が発光するが、トランジスタ１が導通してい
る時、その電力は負荷抵抗１１によって消費され、無効
な熱エネルギとなって発散している。Further, when a light emitting diode is used as a light emitting element, the light emitting diode is usually driven by a differential amplifier type current switching circuit in order to eliminate the influence of ambient temperature and obtain stable circuit operation. Fig. 2 shows a light emitting diode drive circuit using a conventional differential amplifier type current switching circuit, where 9 is a transistor 1.1°, transistor 2.11
is the load resistance of transistor 1, 12 is the light emitting diode,
13 is constant current circuit, 14 is power input, 15 is reference potential (
- 3 A, 0 In Figure 2, transistors 1 and 2 have their emitters connected by a common constant current circuit 15, so transistors 1 and 2 always work differentially, and input signal 1 5) When the transistor 2 is conductive, the light emitting diode 12 emits light, but when the transistor 1 is conductive, the power is consumed by the load resistor 11 and is dissipated as useless thermal energy.

（４）発明の目的 本発明は、前記従来の方法の欠点に鑑み、光通信システ
ムの光信号の２重化にょシ、通信の信頼性の向上全針９
、またそれを、経済的に実現させ得る手段を提供するこ
とを目的としている。(4) Purpose of the Invention In view of the drawbacks of the conventional methods, the present invention aims to improve the reliability of communication by duplicating optical signals in an optical communication system.
, and to provide a means to achieve this economically.

（５）　　発明の構成 そして、この目的は、伝送すべき情報による変調を受け
た光信号と、これと逆極性の変Ｉｌｌを受は次光信号と
を、１対の信号として通信を行なうことにより、そして
、該逆極性の変調は、差動増幅器型電流切替回路の発光
ダイオードと対称位置にある負荷抵抗を、発光ダイオー
ドに置換することにより容易に達成出来る。(5) Structure of the invention The purpose of this invention is to perform communication as a pair of signals, including an optical signal modulated by information to be transmitted and a subsequent optical signal that receives polarity change of opposite polarity. The opposite polarity modulation can be easily achieved by replacing the load resistor located symmetrically with the light emitting diode of the differential amplifier type current switching circuit with a light emitting diode.

伝送すべき情報による変ｐ＋’を受けた光信号と、これ
と逆極性の変調を受けた光信号とよりなる１対の信号は
、その波長が同一である、　場合には、それぞ５れ別個
の光ファイバにより伝送する必要があるが、異なる波長
の光を使用すれば、同一伝送路（光ファイバ）に重畳し
、受信端で分離する方法が採れるので、伝送路の経済化
が計れる。A pair of signals consisting of an optical signal modulated p+' by the information to be transmitted and an optical signal modulated with the opposite polarity have the same wavelength. Although it is necessary to transmit through separate optical fibers, by using lights of different wavelengths, it is possible to overlap them on the same transmission path (optical fiber) and separate them at the receiving end, making the transmission path more economical.

前者は、伝送路の２重化により信頼性向上を計る場合に
適し、後者は、同一伝送路ではあるが、光の波長が異な
る事による、周波数依存の故障の救済と、受信側で原信
号と逆位相信号全差動型の受光回路で増幅することによ
り、信号対雑音比（ＳＺＮ比）の向上を計ることが出来
る。The former is suitable for improving reliability by duplicating the transmission line, and the latter is suitable for resolving frequency-dependent failures due to the same transmission line but different wavelengths of light, and for resolving the original signal on the receiving side. The signal-to-noise ratio (SZN ratio) can be improved by amplifying the opposite-phase signal with a fully differential photodetector circuit.

（６）発明の実施例 以下本発明の実施例について、図面によシ詳述する。第
３図は、本発明の逆極性の光信号を得る回路の１例であ
って、前述した差動増幅器型電流切替回路（第２図）の
トランジスタ１の負荷抵抗１１を取り去って、その後に
発光ダイオード１６を挿入したものである。(6) Embodiments of the Invention Below, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 3 shows an example of a circuit for obtaining an optical signal of opposite polarity according to the present invention, in which the load resistor 11 of the transistor 1 of the differential amplifier type current switching circuit (FIG. 2) described above is removed, and then A light emitting diode 16 is inserted.

本図で、入力信号１の極性に対応して、トランジスタ１
とトランジスタ２がそれぞれ逆極性のスイッチングを行
ない、これにより発光ダイオード１２および発光ダイオ
ード唱６がそれぞれ逆極性の変調を受は発光する。本回
路は、本来無効な熱エネルギ源となっていた電力を使用
して逆極性で発光ダイオードを駆動するものでアシ、第
２図の回路に比較して省費電力が増加することは無い。In this diagram, transistor 1 corresponds to the polarity of input signal 1.
The transistors 2 and 2 respectively perform switching with opposite polarities, so that the light-emitting diode 12 and the light-emitting diode 6 each receive modulation with opposite polarities and emit light. This circuit drives a light emitting diode with reverse polarity using electric power, which was originally an ineffective thermal energy source, so there is no increase in power savings compared to the circuit shown in FIG.

波長の異なる光信号が必要な場合には、発光波長の異な
る発光ダイオ−ドラ使用することにょシ目的が達せられ
る。If optical signals with different wavelengths are required, the purpose can be achieved by using light emitting diodes with different emission wavelengths.

第４図は、伝送路がループ状に閉じられている場合の２
重化の１例である。第４図において、１７．１８．１９
．２ｏはそれぞれ通信ステーション、２１＃ｉ左ｍｐの
伝送ルート、２２は右廻シの伝送ルートを示しておシ、
左廻シの伝送ルート２１および右廻シの伝送ルート２２
には、互に逆方向の極性に変調された光信号が、印加さ
れている。Figure 4 shows two cases where the transmission line is closed in a loop.
This is an example of deterioration. In Figure 4, 17.18.19
．． 2o indicates the communication station, 21#i indicates the transmission route for the left mp, 22 indicates the transmission route for the right mp,
Left-handed transmission route 21 and right-handed transmission route 22
Optical signals modulated with polarities in opposite directions are applied to the .

この方法では、一部の通信ステーションや伝送路が故障
した場合でも、他の伝送ルートが確保されるので、非常
に信頼性の高い通信れ 網が形成さえる。With this method, even if some communication stations or transmission lines fail, other transmission routes are secured, creating a highly reliable communication network.

第５図は、同一伝送路に異なった波長の、光信号を重畳
させる場合の１例である。図において２５は光カプラ、
２４は光分波器、２５は、差動型の受光回路である。FIG. 5 is an example of a case where optical signals of different wavelengths are superimposed on the same transmission path. In the figure, 25 is an optical coupler;
24 is an optical demultiplexer, and 25 is a differential light receiving circuit.

入力信号１によシ変調された発光ダイオード１２によシ
ミ気ｌ光変換された光信号と、これと逆の極性の変調を
受は発光ダイオード１６によシミ気−光変換された波長
の異なる光信号は、光カプラ２３で、同一伝送路（光イ
　　　　　ファイ・・）に送シ込まれる。The light signal modulated by the input signal 1 is converted into light by the light emitting diode 12, and the light signal which receives the modulation of the opposite polarity is converted into light by the light emitting diode 16, which has a different wavelength. The optical signals are sent to the same transmission path (optical interface) by the optical coupler 23.

受信側では、これを分波器２４で、分離し、両信号を差
動形の受光回路２５で増幅する。On the receiving side, the signals are separated by a demultiplexer 24, and both signals are amplified by a differential light receiving circuit 25.

これによシ、原信号振幅は２倍のレベルになるので、結
果として、信号対雑音比（Ｓ／Ｎ比）は６　ｄｂ内向上
る。As a result, the original signal amplitude is doubled in level, and as a result, the signal-to-noise ratio (S/N ratio) is improved by 6 db.

（７）発明の効果 以上詳細に説明したように、本来の信号と、その逆極性
の変調を受けた光信号とからなる１対の信号を用いる本
発明の光信号２重化伝送方式は、従来からの差動増幅器
型電流切替回路の一方のトランジスタの負荷抵抗を発光
ダイオードに変えるのみで、逆位相の変調を受けた光信
号を得ることが出来るなど、比較的容易に実現出来る部
分が多く、また従来全く無駄に負荷抵抗に消費されてい
た電力を光エネルギに変換して使用するなどの効果もあ
る。(7) Effects of the Invention As explained in detail above, the optical signal duplication transmission system of the present invention uses a pair of signals consisting of an original signal and an optical signal modulated with the opposite polarity. There are many aspects that can be realized relatively easily, such as the ability to obtain an optical signal modulated in the opposite phase by simply changing the load resistance of one transistor of a conventional differential amplifier type current switching circuit to a light emitting diode. Furthermore, there are also effects such as converting the electric power that was conventionally wasted in the load resistor into optical energy and using it.

光ファイバによる信号の伝送方式は、多くの長所かあシ
ながらも、光ファイバが非常に細い径のガラスである事
による、故障が発生した時の取シ扱いが面、倒で、修理
時間が長くか＼るなどの問題がある。そのため通信系の
信頼性向上策が望まれる所であるが、本発明の方法によ
れば、比較的経済的に、信頼性を向上させる事が出来る
ので効果は大きい。Although the signal transmission method using optical fiber has many advantages, since the optical fiber is made of glass with a very small diameter, it is troublesome to handle when a failure occurs, and the repair time is short. There are problems such as it takes a long time. Therefore, measures to improve the reliability of the communication system are desired, and the method of the present invention is highly effective because reliability can be improved relatively economically.

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

第１図は、光フアイバケーブル伝送方式の構成を示す図
、第２図は従来の差動増幅器型電流切替回路による発光
ダイオードの駆動回路を示す図、第３図は、逆極性の光
信号を得る回路の１例を示す図、第４図は、伝送路がル
ープ状に閉じられている場合の２重化の１例を示す図、
第５図は同一伝送路に異なった波長の光信号を重畳させ
る場合の１例を示す図である。 １・・・入力信号、２・・・発光素子の駆動回路、５・
・・発光素子、４・・・光ファイバ、５・・・光フアイ
バケーブル、６・・・受光素子、７・・・信号再生回路
、８・・・出力信号、９・・・トランジスタ（Ｔｒ　１
）、”・・・トランジスタ（Ｔｒ　　２）、１１・・−
負荷抵抗、１２・・・発光ダイオード、１３・・・定電
流回路、１４・・・電源入力、１５・・・基準信号、１
６・・・発光ダイオード、１７．１８．１９．２０・・
・通信ステーション、２１・・・左廻シの伝送ルート、
２２・・・右廻シの伝送ルート、２３・・・光カブラ、
２４・・・光分波器、２５・・・差動型の受光回路。 代理人弁理士　松　岡　宏四部Figure 1 shows the configuration of an optical fiber cable transmission system, Figure 2 shows a light emitting diode drive circuit using a conventional differential amplifier type current switching circuit, and Figure 3 shows an optical signal of opposite polarity. FIG. 4 is a diagram showing an example of duplication when the transmission path is closed in a loop.
FIG. 5 is a diagram showing an example of a case where optical signals of different wavelengths are superimposed on the same transmission path. DESCRIPTION OF SYMBOLS 1... Input signal, 2... Drive circuit for light emitting element, 5.
... Light emitting element, 4... Optical fiber, 5... Optical fiber cable, 6... Light receiving element, 7... Signal regeneration circuit, 8... Output signal, 9... Transistor (Tr 1
), ”...transistor (Tr 2), 11...-
Load resistance, 12... Light emitting diode, 13... Constant current circuit, 14... Power supply input, 15... Reference signal, 1
6...Light emitting diode, 17.18.19.20...
・Communication station, 21... left-handed transmission route,
22... Right-handed transmission route, 23... Optical coupler,
24... Optical demultiplexer, 25... Differential type light receiving circuit. Representative Patent Attorney Hiroshi Matsuoka

Claims (2)

【特許請求の範囲】[Claims] （１）光通信において、伝送すべき情報による変調を受
けた光信号と、これと逆極性の変調を受けた光信号とか
らなる１対の信号により通信することを特徴とする光信
号２重化伝送方式。(1) In optical communication, optical signal duplexing is characterized in that communication is performed using a pair of signals consisting of an optical signal modulated by information to be transmitted and an optical signal modulated with the opposite polarity. transmission method. （２）相互に逆極性の変調を受けた１対の光信号音、差
動増幅器型電流切替回路の電流切替作用で、交互に駆動
される２個の発光ダイオードの出力光によって得る、特
許請求の範囲第１項記載の光信号２重化伝送方式。(2) A patent claim in which a pair of optical signal sounds modulated with mutually opposite polarities is obtained by the output light of two light emitting diodes that are driven alternately by the current switching action of a differential amplifier type current switching circuit. The optical signal duplication transmission system according to item 1.
JP57107260A 1982-06-22 1982-06-22 Optical signal duplex transmission system Pending JPS58223933A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57107260A JPS58223933A (en) 1982-06-22 1982-06-22 Optical signal duplex transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57107260A JPS58223933A (en) 1982-06-22 1982-06-22 Optical signal duplex transmission system

Publications (1)

Publication Number Publication Date
JPS58223933A true JPS58223933A (en) 1983-12-26

Family

ID=14454534

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57107260A Pending JPS58223933A (en) 1982-06-22 1982-06-22 Optical signal duplex transmission system

Country Status (1)

Country Link
JP (1) JPS58223933A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0528225A2 (en) * 1991-08-15 1993-02-24 General Instrument Corporation Of Delaware Low distortion laser system for am fiber optic communication

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0528225A2 (en) * 1991-08-15 1993-02-24 General Instrument Corporation Of Delaware Low distortion laser system for am fiber optic communication

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