JPS5776946A - Automatic gain control system - Google Patents

Automatic gain control system

Info

Publication number
JPS5776946A
JPS5776946A JP55151401A JP15140180A JPS5776946A JP S5776946 A JPS5776946 A JP S5776946A JP 55151401 A JP55151401 A JP 55151401A JP 15140180 A JP15140180 A JP 15140180A JP S5776946 A JPS5776946 A JP S5776946A
Authority
JP
Japan
Prior art keywords
gain control
control
reference voltage
gain
apd1
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
JP55151401A
Other languages
Japanese (ja)
Inventor
Koichi Oota
Yukio Minami
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 JP55151401A priority Critical patent/JPS5776946A/en
Publication of JPS5776946A publication Critical patent/JPS5776946A/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
    • H04B10/60—Receivers
    • H04B10/66—Non-coherent receivers, e.g. using direct detection
    • H04B10/69—Electrical arrangements in the receiver
    • H04B10/693—Arrangements for optimizing the preamplifier in the receiver
    • H04B10/6931—Automatic gain control of the preamplifier
    • 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)
  • Control Of Amplification And Gain Control (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To make easy the gain adjustment, by using a reference voltage used for automatic gain control as the gain control of an amplifier. CONSTITUTION:An output voltage of a reference voltage generating circuit 8 used for automatic gain control is also used for gain control of a comparison amplifier 6. Thus, at greater optical power, AGC is made with the gain control of the AGC amplifier 2 and at smaller optical power, a part of this reference voltage is used as the reference voltage for bias voltage control, and the bias voltage of an Avalanche photo diode APD1 is controlled, and the feedback amount of bias control to the APD1 is made for optimum bias control by matching the amount with the dispersion of the APD1 and changing the feedback gain. As a result, even if the APD has a dispersion, the gain adjustment is easy and the characteristics can be set optimizingly.
JP55151401A 1980-10-30 1980-10-30 Automatic gain control system Pending JPS5776946A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55151401A JPS5776946A (en) 1980-10-30 1980-10-30 Automatic gain control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55151401A JPS5776946A (en) 1980-10-30 1980-10-30 Automatic gain control system

Publications (1)

Publication Number Publication Date
JPS5776946A true JPS5776946A (en) 1982-05-14

Family

ID=15517777

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55151401A Pending JPS5776946A (en) 1980-10-30 1980-10-30 Automatic gain control system

Country Status (1)

Country Link
JP (1) JPS5776946A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59153313A (en) * 1983-02-22 1984-09-01 Nec Ic Microcomput Syst Ltd Semiconductor integrated circuit
JPS6220407A (en) * 1985-07-19 1987-01-29 Matsushita Electric Ind Co Ltd Agc circuit for optical communication
US5410363A (en) * 1992-12-08 1995-04-25 Lightwave Communications, Inc. Automatic gain control device for transmitting video signals between two locations by use of a known reference pulse during vertical blanking period so as to control the gain of the video signals at the second location

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5370480A (en) * 1976-12-06 1978-06-22 Hitachi Ltd Photo agc system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5370480A (en) * 1976-12-06 1978-06-22 Hitachi Ltd Photo agc system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59153313A (en) * 1983-02-22 1984-09-01 Nec Ic Microcomput Syst Ltd Semiconductor integrated circuit
JPS6220407A (en) * 1985-07-19 1987-01-29 Matsushita Electric Ind Co Ltd Agc circuit for optical communication
US5410363A (en) * 1992-12-08 1995-04-25 Lightwave Communications, Inc. Automatic gain control device for transmitting video signals between two locations by use of a known reference pulse during vertical blanking period so as to control the gain of the video signals at the second location

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