JPH02166780A - Optical transmitter - Google Patents

Optical transmitter

Info

Publication number
JPH02166780A
JPH02166780A JP63320627A JP32062788A JPH02166780A JP H02166780 A JPH02166780 A JP H02166780A JP 63320627 A JP63320627 A JP 63320627A JP 32062788 A JP32062788 A JP 32062788A JP H02166780 A JPH02166780 A JP H02166780A
Authority
JP
Japan
Prior art keywords
circuit
comparator
voltage
transistor
input
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
JP63320627A
Other languages
Japanese (ja)
Inventor
Takashi Mori
茂利　隆司
Koichi Ota
太田　紘一
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP63320627A priority Critical patent/JPH02166780A/en
Publication of JPH02166780A publication Critical patent/JPH02166780A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/068—Stabilisation of laser output parameters
    • H01S5/06808—Stabilisation of laser output parameters by monitoring the electrical laser parameters, e.g. voltage or current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/068—Stabilisation of laser output parameters
    • H01S5/06825—Protecting the laser, e.g. during switch-on/off, detection of malfunctioning or degradation

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Semiconductor Lasers (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To increase the lifetime of a laser diode and to reduce the power consumption of an LD driving circuit with an electronic cooling circuit by providing a control circuit for judging the presence or absence of a signal input and turning ON, or OFF the LD and a cooling element. CONSTITUTION:An LD driving circuit is composed of a switching circuit 1, an LD module 2, transistors 5, 6, an amplifier 7, a rectifier 8, and a comparator 9. When a signal is input to the LD driving circuit, it is amplified by the ampli fier 7, and rectified by the rectifier 8 to obtain a DC voltage. Then, the DC voltage is compared with V10 by the comparator 9. When the V10 is suitably set, the output of the comparator 9 becomes 'H', the switch circuit 1 is con nected between A and C to operate the transistor 5, and the LD 3 emits a light. The transistor 6 is also turned ON, and a current flows to a Peltier ele ment 4. Then, when the signal input is turned OFF, the input voltage is further lowered, and the output of the comparator 9 becomes 'L'. The switch circuit 1 is connected between C and D, the emission of the LD-3 is stopped, and no current flows to the Peltier element 4. Accordingly, the lifetime of the LD is increased, and power consumption is reduced.

Description

【発明の詳細な説明】 〔産業上の利用分桁〕 本発明は、信号入力が無いとき、ＬＤの発光を止めると
同時に、冷却回路の動作を停市する機能に係り１％に、
ＬＤの長寿命化と、消費電力の省力化に好適な光送信器
に関する。[Detailed Description of the Invention] [Industrial Applicability] The present invention has a function of stopping the light emission of the LD and simultaneously stopping the operation of the cooling circuit when there is no signal input.
The present invention relates to an optical transmitter suitable for extending the life of an LD and reducing power consumption.

〔従来の技術〕[Conventional technology]

従来の装置は、「光フアイバ応用技術集成」（日経技術
図書■）の２１４ページに記載のように、「ベルチェ素
子で呈温近くに制御する」となっていた。As described on page 214 of ``Optical Fiber Application Technology Collection'' (Nikkei Technical Book ■), the conventional device was ``controlled to near temperature using a Vertier element.''

また、ベルチェ素子により冷却する場合は、数Ａの電流
が必要である。Moreover, when cooling with a Vertier element, a current of several amperes is required.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上記従来技術は、無信号入力時の、消費電力について配
慮されておらず、ＬＤの寿命及び、消費電力が大きいと
いう問題があった。The above-mentioned conventional technology does not consider power consumption when no signal is input, and has problems in that the life of the LD is long and the power consumption is large.

本発明の目的は、レーザーダイオードの長寿命化と、を
子冷却回路付ＬＤ駆動回路の低消費電力化を行うことに
ある。An object of the present invention is to extend the life of a laser diode and to reduce the power consumption of an LD drive circuit with a laser diode cooling circuit.

〔課題を解決するための手段〕[Means to solve the problem]

上記目的は、信号入力の有無を判断して、ＬＤ及び、冷
却素子をオン、オフする制御回路を設けることにより達
成される。The above object is achieved by providing a control circuit that determines the presence or absence of a signal input and turns on and off the LD and the cooling element.

〔作用〕[Effect]

信号入力の有無は、整流回路を設け、この整流回路の直
流電圧を比較することによシ１判断し。The presence or absence of a signal input is determined by providing a rectifier circuit and comparing the DC voltages of this rectifier circuit.

スイッチ回路を制御する。Control the switch circuit.

このスイッチ回路によ、す、ＬＤの駆動回路のオン、オ
フ及び、冷却回路のオン、オフを同時に行うので誤動作
することがない。This switch circuit simultaneously turns on and off the LD drive circuit and turns on and off the cooling circuit, thereby preventing malfunctions.

て実施例〕 以下１本発明の一実施例を図により説明する。Examples] An embodiment of the present invention will be described below with reference to the drawings.

ＬＤ駆動回路は、スイッチ回路−１，ＬＤモジュール−
２，トランジスター５．６．増幅器−７，整流回路−８
，比較器−９より構成される。The LD drive circuit includes switch circuit-1, LD module-
2, Transistor 5.6. Amplifier-7, rectifier circuit-8
, comparator-9.

まず信号が、ＬＤ駆動回路に入力されているときについ
て説明する。信号は、増幅器−７で増幅され、整流器−
８で整流され、直流電圧を得る。First, the case where a signal is input to the LD drive circuit will be explained. The signal is amplified by amplifier-7 and rectifier-
8 to obtain a DC voltage.

この直流電圧とｖ−ｉｏとが比較器−９で比較される。This DC voltage and v-io are compared by a comparator-9.

Ｖ−１ｏ？！−適当な値に設定することにより、比較器
−９の出力はＨとなり、スイッチ回路−１はＡ−０間が
接続されるため、トランジスター５が動作するので、Ｌ
Ｄ−３は発光する。また、トランジスター６も同時にオ
ンするため、ペルチェ素子−４に電流が流れる。V-1o? ! - By setting an appropriate value, the output of the comparator-9 becomes H, and since the switch circuit-1 is connected between A and 0, the transistor 5 operates, so the output becomes L.
D-3 emits light. Further, since the transistor 6 is also turned on at the same time, a current flows through the Peltier element-4.

次和、信号入力がオフしたとき、比較器−９の入力電圧
が、■より低くなることにより、比較器−９の出力がＬ
　となる。When the signal input is turned off, the input voltage of comparator-9 becomes lower than ■, and the output of comparator-9 becomes L.
becomes.

さらに、スイッチ回路−１は、Ｃ−８間が接続されるこ
とにより、トランジスター５がオフする。Further, in the switch circuit-1, the transistor 5 is turned off by connecting C-8.

これによ、りＩ、Ｄ−３の発光が停止する。As a result, the light emission of lights I and D-3 is stopped.

また、トランジスター６もオフすることにより。Also, by turning off transistor 6.

ペルチェ素子−４には電流が流れなくなる。Current no longer flows through the Peltier element-4.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、信号入力の有無により、　ＬＤの発光
及び停止、ベルチェ素子のオン、オフが出来るので、Ｌ
Ｄの長寿命化と、低消費電力化の効果がある。According to the present invention, depending on the presence or absence of a signal input, the LD can emit and stop light emission, and the Bertier element can be turned on and off.
This has the effect of extending the life of D and reducing power consumption.

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

図は本発明の一実施例の回路図である。 １・・・スイッチ回＆！、　　２・・・ＬＤモジュール
、３・・・ＬＤ、　　　　　　　４・・・ベルチェ素子
。 ５．６・・・トランジスタ、７・・・増幅器。 ８・・・整流回路、　　　　９・・・比較器。 １０・・・直流電圧。 、／７′ 代理人弁理士　小　川　勝　（男 （、The figure is a circuit diagram of an embodiment of the present invention. 1... Switch times &! , 2... LD module, 3... LD, 4... Vertier element. 5.6...transistor, 7...amplifier. 8... Rectifier circuit, 9... Comparator. 10...DC voltage. ,/7' Representative Patent Attorney Masaru Ogawa (Male)

Claims (1)

【特許請求の範囲】[Claims] １、電子冷却付半導体レーザダイオードモジュールと、
ＬＤ（レーザーダイオード）駆動回路より成る光送信器
において、信号入力検出回路と、ＬＤ枢動回路及び、電
子冷却回路をオン、オフするスイッチを設けたことを特
徴とする光送信器。1. A semiconductor laser diode module with electronic cooling;
An optical transmitter comprising an LD (laser diode) driving circuit, characterized in that the optical transmitter is provided with a switch for turning on and off a signal input detection circuit, an LD pivot circuit, and an electronic cooling circuit.
JP63320627A 1988-12-21 1988-12-21 Optical transmitter Pending JPH02166780A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63320627A JPH02166780A (en) 1988-12-21 1988-12-21 Optical transmitter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63320627A JPH02166780A (en) 1988-12-21 1988-12-21 Optical transmitter

Publications (1)

Publication Number Publication Date
JPH02166780A true JPH02166780A (en) 1990-06-27

Family

ID=18123517

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63320627A Pending JPH02166780A (en) 1988-12-21 1988-12-21 Optical transmitter

Country Status (1)

Country Link
JP (1) JPH02166780A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0722678A (en) * 1993-06-30 1995-01-24 Nec Corp Temperature control circuit
KR100556002B1 (en) * 2001-08-09 2006-03-03 세이코 엡슨 가부시키가이샤 Light transmitter
KR100893214B1 (en) * 2007-03-22 2009-04-16 삼성전자주식회사 Apparatus and metod for controlling optical transmission in optical network unit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0722678A (en) * 1993-06-30 1995-01-24 Nec Corp Temperature control circuit
KR100556002B1 (en) * 2001-08-09 2006-03-03 세이코 엡슨 가부시키가이샤 Light transmitter
KR100893214B1 (en) * 2007-03-22 2009-04-16 삼성전자주식회사 Apparatus and metod for controlling optical transmission in optical network unit

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