JPS5488704A - Automatic gain control system - Google Patents

Automatic gain control system

Info

Publication number
JPS5488704A
JPS5488704A JP15708077A JP15708077A JPS5488704A JP S5488704 A JPS5488704 A JP S5488704A JP 15708077 A JP15708077 A JP 15708077A JP 15708077 A JP15708077 A JP 15708077A JP S5488704 A JPS5488704 A JP S5488704A
Authority
JP
Japan
Prior art keywords
output
gain
circuit
comparator
voltage
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
JP15708077A
Other languages
Japanese (ja)
Other versions
JPS6047783B2 (en
Inventor
Yasuhiro Tanaka
Etsugo Yoneda
Risuke Shimodaira
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
NEC Corp
Nippon Telegraph and Telephone Corp
Original Assignee
Fujitsu Ltd
NEC Corp
Nippon Telegraph and Telephone 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 Fujitsu Ltd, NEC Corp, Nippon Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical Fujitsu Ltd
Priority to JP52157080A priority Critical patent/JPS6047783B2/en
Publication of JPS5488704A publication Critical patent/JPS5488704A/en
Publication of JPS6047783B2 publication Critical patent/JPS6047783B2/en
Expired 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)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To make broader the range of automatic gain control and to enable stable operation, by controlling the loop gain which controls the variable gain amplifying circuit with the gain under limit of the gain control loop of the variable gain photo detection circuit. CONSTITUTION:the reception signal is converted into electric signal with the avalanche photo diode APD11, amplification is made with the variable gain amplifier 12 and output is made to the identification circuit 15 and the peak detector 13. When the peak detection output is compared 17 and the voltage control circuit 16 determines the lower limit of the output voltage in advance. The output of the comparator 14 controls the circuit 16. The control loop in which the output voltage is the bias voltage of APD 11 and the control loop controlling the amplifier 12 with the output of the comparator 17 when the output of the comparator 14 is more than a given value, are automatically changed over, holding the reception output level at a constant value. Thus, the range of automatic gain control is made broader and stable operation can be performed.
JP52157080A 1977-12-26 1977-12-26 Automatic gain control method Expired JPS6047783B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP52157080A JPS6047783B2 (en) 1977-12-26 1977-12-26 Automatic gain control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP52157080A JPS6047783B2 (en) 1977-12-26 1977-12-26 Automatic gain control method

Publications (2)

Publication Number Publication Date
JPS5488704A true JPS5488704A (en) 1979-07-14
JPS6047783B2 JPS6047783B2 (en) 1985-10-23

Family

ID=15641800

Family Applications (1)

Application Number Title Priority Date Filing Date
JP52157080A Expired JPS6047783B2 (en) 1977-12-26 1977-12-26 Automatic gain control method

Country Status (1)

Country Link
JP (1) JPS6047783B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56152348A (en) * 1980-04-25 1981-11-25 Fujitsu Ltd Photoelectric converting circuit
JPS5944136A (en) * 1982-09-07 1984-03-12 Japan Radio Co Ltd Photodetecting circuit
JPS5961645U (en) * 1982-10-15 1984-04-23 株式会社日立製作所 optical receiver
JPS63215126A (en) * 1987-03-03 1988-09-07 Mitsubishi Electric Corp Light receiving amplifier
DE10048538B4 (en) * 1999-10-21 2004-04-08 Infineon Technologies North America Corp., San Jose Fast switching comparator with hysteresis

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56152348A (en) * 1980-04-25 1981-11-25 Fujitsu Ltd Photoelectric converting circuit
JPS5944136A (en) * 1982-09-07 1984-03-12 Japan Radio Co Ltd Photodetecting circuit
JPS5961645U (en) * 1982-10-15 1984-04-23 株式会社日立製作所 optical receiver
JPS63215126A (en) * 1987-03-03 1988-09-07 Mitsubishi Electric Corp Light receiving amplifier
DE10048538B4 (en) * 1999-10-21 2004-04-08 Infineon Technologies North America Corp., San Jose Fast switching comparator with hysteresis

Also Published As

Publication number Publication date
JPS6047783B2 (en) 1985-10-23

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