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JPS574625A - Optical communication system - Google Patents

Optical communication system

Info

Publication number
JPS574625A
JPS574625A JP7798180A JP7798180A JPS574625A JP S574625 A JPS574625 A JP S574625A JP 7798180 A JP7798180 A JP 7798180A JP 7798180 A JP7798180 A JP 7798180A JP S574625 A JPS574625 A JP S574625A
Authority
JP
Japan
Prior art keywords
output
intensity
modulation
amplitude
receiver
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
JP7798180A
Other languages
Japanese (ja)
Inventor
Akira Mita
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP7798180A priority Critical patent/JPS574625A/en
Publication of JPS574625A publication Critical patent/JPS574625A/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

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To realize a long-distance communication and to improve the noise resistance, by inducing a relaxation oscillation having a certain frequency and light intensity to transmit an output after a modulation of amplitude and then receiving the output by a receiver that can perform simultaneously both a photodetection and amplification by means of an avalanche photodiode. CONSTITUTION:The output of an external standard reference frequency source 10 is applied to a comparison detector 11 along with an electric output 6, and a DC output is fed back in the form of a DC bias of a semiconductor laser 1 through a coupler 9 to stabilize the frequency. At the same time, the output intensity is detected by a wave detector 2, and then a variable attenuator is controlled to keep the optical output intensity at a certain level. Then the output optical pulse train is transmitted after receiving a modulation of amplitude through an external modulator 13. At a receiver, a signal light 33 is made incident to an avalanche photodiode 32 in a coaxial-type resonance cavity device 31, and a reproduced signal is obtained through a wave detector 34.
JP7798180A 1980-06-10 1980-06-10 Optical communication system Pending JPS574625A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7798180A JPS574625A (en) 1980-06-10 1980-06-10 Optical communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7798180A JPS574625A (en) 1980-06-10 1980-06-10 Optical communication system

Publications (1)

Publication Number Publication Date
JPS574625A true JPS574625A (en) 1982-01-11

Family

ID=13649045

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7798180A Pending JPS574625A (en) 1980-06-10 1980-06-10 Optical communication system

Country Status (1)

Country Link
JP (1) JPS574625A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4611352A (en) * 1983-03-31 1986-09-09 Matsushita Electric Industrial Co., Ltd. Optical transmission apparatus
US6266169B1 (en) 1992-04-08 2001-07-24 Hitachi, Ltd. Optical transmission equipment which transmits an amplified optical data signal and an optical surveillance signal
US7006771B1 (en) * 1999-02-19 2006-02-28 Fujitsu Limited Optical communication apparatus and optical add/drop apparatus

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4611352A (en) * 1983-03-31 1986-09-09 Matsushita Electric Industrial Co., Ltd. Optical transmission apparatus
US6266169B1 (en) 1992-04-08 2001-07-24 Hitachi, Ltd. Optical transmission equipment which transmits an amplified optical data signal and an optical surveillance signal
US6728489B2 (en) 1992-04-08 2004-04-27 Hitachi, Ltd. Optical transmission system constructing method and system
US7167652B2 (en) 1992-04-08 2007-01-23 Hitachi, Ltd Optical transmission system constructing method and system
US7292785B2 (en) 1992-04-08 2007-11-06 Hitachi, Ltd. Optical transmission system constructing method and system
US7006771B1 (en) * 1999-02-19 2006-02-28 Fujitsu Limited Optical communication apparatus and optical add/drop apparatus
US7389054B2 (en) 1999-02-19 2008-06-17 Fujitsu Limited Optical communication apparatus and optical add/drop apparatus
US7577368B2 (en) 1999-02-19 2009-08-18 Fujitsu Limited Optical communication apparatus and optical add/drop apparatus
US7953329B2 (en) 1999-02-19 2011-05-31 Fujitsu Limited Optical communication apparatus and optical add/drop apparatus
US8521039B2 (en) 1999-02-19 2013-08-27 Fujitsu Limited Optical communication apparatus and optical add/drop apparatus

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