JPS5480095A - Agc system for optical receiver - Google Patents

Agc system for optical receiver

Info

Publication number
JPS5480095A
JPS5480095A JP14762077A JP14762077A JPS5480095A JP S5480095 A JPS5480095 A JP S5480095A JP 14762077 A JP14762077 A JP 14762077A JP 14762077 A JP14762077 A JP 14762077A JP S5480095 A JPS5480095 A JP S5480095A
Authority
JP
Japan
Prior art keywords
diode
circuit
increase
output
time constant
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
JP14762077A
Other languages
Japanese (ja)
Inventor
Takashi Toge
Yasuo Nagai
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 JP14762077A priority Critical patent/JPS5480095A/en
Publication of JPS5480095A publication Critical patent/JPS5480095A/en
Pending legal-status Critical Current

Links

Landscapes

  • Light Receiving Elements (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE: To prevent the increase of the time constant and then to increase the dynamic range of AGC by reducing the resistance value of the load applied to the avalanche photo diode in accordance with the increase of the diode capacity.
CONSTITUTION: Optical input 1 is applied to avalanche diode 2, and the electrc output generated there is amplified through amplifier 3 to be extracted through output terminal 4. On the other hand, the output of amplifier 3 is detected through detector circuit 5 and then compared at comparator circfuit 6 to which reference voltage input 7 is applied. And in case the detection output of circuit 5 is higher than the reference voltage, the comparison output corresponding to the error voltage is applied to DC high-voltage generator circuit 8 where the reverse bias voltage is applied to diode 2. In such constitution, the capacity value increases as the absolute value of the reverse bias voltage decreased, and the CR time constant increases. In this connectiin, variable resistance circuit 9 with its resistance value reducing is provided newly between diode 2 and amplifer 3 and then connected to the joint of circuit 6 and 8. Thus, the increase of the time constant can be prevented.
COPYRIGHT: (C)1979,JPO&Japio
JP14762077A 1977-12-08 1977-12-08 Agc system for optical receiver Pending JPS5480095A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14762077A JPS5480095A (en) 1977-12-08 1977-12-08 Agc system for optical receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14762077A JPS5480095A (en) 1977-12-08 1977-12-08 Agc system for optical receiver

Publications (1)

Publication Number Publication Date
JPS5480095A true JPS5480095A (en) 1979-06-26

Family

ID=15434433

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14762077A Pending JPS5480095A (en) 1977-12-08 1977-12-08 Agc system for optical receiver

Country Status (1)

Country Link
JP (1) JPS5480095A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5531367U (en) * 1978-08-22 1980-02-29
JPS5757049A (en) * 1980-09-22 1982-04-06 Fujitsu Ltd Light agc system
JPS5923642A (en) * 1982-07-09 1984-02-07 モトロ−ラ・インコ−ポレ−テツド Front end circuit for infrared ray receiver
JPS59100641A (en) * 1982-11-30 1984-06-09 Fujitsu Ltd Agc system of average optical power detection

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5531367U (en) * 1978-08-22 1980-02-29
JPS596018Y2 (en) * 1978-08-22 1984-02-24 株式会社東芝 Light receiving circuit for optical communication equipment
JPS5757049A (en) * 1980-09-22 1982-04-06 Fujitsu Ltd Light agc system
JPH0145255B2 (en) * 1980-09-22 1989-10-03 Fujitsu Ltd
JPS5923642A (en) * 1982-07-09 1984-02-07 モトロ−ラ・インコ−ポレ−テツド Front end circuit for infrared ray receiver
JPS59100641A (en) * 1982-11-30 1984-06-09 Fujitsu Ltd Agc system of average optical power detection
JPH0122780B2 (en) * 1982-11-30 1989-04-27 Fujitsu Ltd

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