JPS5775042A - Optical communication system - Google Patents

Optical communication system

Info

Publication number
JPS5775042A
JPS5775042A JP55151810A JP15181080A JPS5775042A JP S5775042 A JPS5775042 A JP S5775042A JP 55151810 A JP55151810 A JP 55151810A JP 15181080 A JP15181080 A JP 15181080A JP S5775042 A JPS5775042 A JP S5775042A
Authority
JP
Japan
Prior art keywords
light receiving
pilot
pilot signal
converted
receiving diode
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.)
Granted
Application number
JP55151810A
Other languages
Japanese (ja)
Other versions
JPS6114697B2 (en
Inventor
Akimasa Yamazaki
Yoichiro Enami
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 JP55151810A priority Critical patent/JPS5775042A/en
Publication of JPS5775042A publication Critical patent/JPS5775042A/en
Publication of JPS6114697B2 publication Critical patent/JPS6114697B2/ja
Granted 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
    • H04B10/60—Receivers
    • H04B10/66—Non-coherent receivers, e.g. using direct detection
    • H04B10/69—Electrical arrangements in the receiver
    • H04B10/691—Arrangements for optimizing the photodetector in the receiver
    • H04B10/6911—Photodiode bias control, e.g. for compensating temperature variations

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To make a stable AGC operation possible, by performing the pilot AGC when the pilot signal is normal and by performing the average value AGC when the pilot signal is abnormal. CONSTITUTION:The optical input from an optical fiber 31 is converted to an electric signal by a light receiving diode 32 and is amplified by an amplifier 33 and is converted to an optical signal by a light emitting diode 34 and is transmitted to an optical fiber 35. A part of the output of the amplifier 33 is applied to a pilot extracting band pass filter 56, and an extracted pilot signal is converted to a DC by an amplifying and rectifying circuit 57 to control the bias voltage of the light receiving diode 32 through a changeover switch 59. When the pilot signal becomes abnormal, the changeover switch 59 is inverted, and an output obtained by applying the output of the light receiving diode 32 to an average receiving light power detecting and amplifying circuit 58 is used for the control of the bias voltage of the light receiving diode 32.
JP55151810A 1980-10-29 1980-10-29 Optical communication system Granted JPS5775042A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55151810A JPS5775042A (en) 1980-10-29 1980-10-29 Optical communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55151810A JPS5775042A (en) 1980-10-29 1980-10-29 Optical communication system

Publications (2)

Publication Number Publication Date
JPS5775042A true JPS5775042A (en) 1982-05-11
JPS6114697B2 JPS6114697B2 (en) 1986-04-19

Family

ID=15526799

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55151810A Granted JPS5775042A (en) 1980-10-29 1980-10-29 Optical communication system

Country Status (1)

Country Link
JP (1) JPS5775042A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6084034A (en) * 1983-06-02 1985-05-13 Nec Corp Optical agc system
JPS62116029A (en) * 1985-11-15 1987-05-27 Fujitsu Ltd Detecting system for cut off of optical signal
US7630631B2 (en) * 2004-04-14 2009-12-08 Finisar Corporation Out-of-band data communication between network transceivers

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6084034A (en) * 1983-06-02 1985-05-13 Nec Corp Optical agc system
JPS62116029A (en) * 1985-11-15 1987-05-27 Fujitsu Ltd Detecting system for cut off of optical signal
US7630631B2 (en) * 2004-04-14 2009-12-08 Finisar Corporation Out-of-band data communication between network transceivers

Also Published As

Publication number Publication date
JPS6114697B2 (en) 1986-04-19

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