JPS5685945A - Automatic gain control system for photoreceiver - Google Patents

Automatic gain control system for photoreceiver

Info

Publication number
JPS5685945A
JPS5685945A JP16329079A JP16329079A JPS5685945A JP S5685945 A JPS5685945 A JP S5685945A JP 16329079 A JP16329079 A JP 16329079A JP 16329079 A JP16329079 A JP 16329079A JP S5685945 A JPS5685945 A JP S5685945A
Authority
JP
Japan
Prior art keywords
output
apd1
photodetection
avalanche photodiode
current
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
JP16329079A
Other languages
Japanese (ja)
Inventor
Tadayoshi Kitayama
Kunio Nakajima
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP16329079A priority Critical patent/JPS5685945A/en
Publication of JPS5685945A publication Critical patent/JPS5685945A/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
    • H04B10/691—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)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To elevate the reliability of an avalanche photodiode, by detecting whether the avalanche photodiode has detected light or not, and controlling the bias voltage of the avalanche photodiode so that it becomes a constant value, when the photodetection has been cut off. CONSTITUTION:When a light signal has been input to the avalanche photodiode (APD)1, a signal current is output from the APD1, the current-voltage conversion is executed by the amplifier 2, and it is output to the terminal 7. At the time of photodetection, whether light has been detected or not is detected by the carrier detector 8, the relay 10 is controlled by its output, the output of the AGC comparator 4 is connected to the DC amplifier 6, and the bias voltage of the APD1 is controlled so that the output current of the APD1 becomes constant. When the photodetection has been cut off, the detector 8 detects it, and controls the relay 10 so that the reference voltage 9 and the amplifier 6 are connected. In this way, the bias voltage of the APD1 drops, and when it has become a photodetecting state again, an excess current does not flow into the APD at the time of starting the photodetection, by detecting said state and closing the AGC loop, and the reliability of the APD is elevated.
JP16329079A 1979-12-14 1979-12-14 Automatic gain control system for photoreceiver Pending JPS5685945A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16329079A JPS5685945A (en) 1979-12-14 1979-12-14 Automatic gain control system for photoreceiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16329079A JPS5685945A (en) 1979-12-14 1979-12-14 Automatic gain control system for photoreceiver

Publications (1)

Publication Number Publication Date
JPS5685945A true JPS5685945A (en) 1981-07-13

Family

ID=15771004

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16329079A Pending JPS5685945A (en) 1979-12-14 1979-12-14 Automatic gain control system for photoreceiver

Country Status (1)

Country Link
JP (1) JPS5685945A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0633517A2 (en) * 1993-07-09 1995-01-11 Hamamatsu Photonics K.K. Bias circuit for avalanche photodiode

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0633517A2 (en) * 1993-07-09 1995-01-11 Hamamatsu Photonics K.K. Bias circuit for avalanche photodiode
EP0633517A3 (en) * 1993-07-09 1996-11-27 Hamamatsu Photonics Kk Bias circuit for avalanche photodiode.

Similar Documents

Publication Publication Date Title
US3644740A (en) Control circuit for biasing a photodetector so as to maintain a selected false alarm rate
JPS6157746B2 (en)
JPS5685945A (en) Automatic gain control system for photoreceiver
JPS5488704A (en) Automatic gain control system
JPS5542304A (en) Tracking mirror protector of optical information reader
JPS5583280A (en) Output stabilizing system for semiconductor laser
JPS57168513A (en) Automatic gain controlling system of optical receiver
SE7906152L (en) CIRCUIT FOR AUTOMATIC AMPLIFIER CONTROL
JPS57180234A (en) Malfunction preventing circuit for photodetector
JPS5437403A (en) Automatic gain control method for light receiving circuit
JPS63151205A (en) Optical receiving circuit
JPS5742218A (en) Delay automatic gain control circuit
JPS56143738A (en) Automatic gain controlling system of light receiver
JPS57207446A (en) Optical reception squeltch circuit
JPS5564452A (en) Photo receiver circuit
JPS56100539A (en) Light agc system
JPS56140789A (en) Color balance control circuit
JP2600462B2 (en) Optical receiving circuit
JPS57111144A (en) Optical automatic gain control system
JPS54120561A (en) Automatic gain control amplifier
JPS5752210A (en) Automatic switching and releasing circuit in automatic gain controlling circuit
JPS5757049A (en) Light agc system
JPS5754444A (en) Optical communication system
JPS56169443A (en) Detecting circuit for input signal interruption
SU943788A1 (en) Fire alarm device