JPS57101443A - Bias controlling circuit - Google Patents

Bias controlling circuit

Info

Publication number
JPS57101443A
JPS57101443A JP55177093A JP17709380A JPS57101443A JP S57101443 A JPS57101443 A JP S57101443A JP 55177093 A JP55177093 A JP 55177093A JP 17709380 A JP17709380 A JP 17709380A JP S57101443 A JPS57101443 A JP S57101443A
Authority
JP
Japan
Prior art keywords
voltage
bias controlling
converter
circuit
signal
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
JP55177093A
Other languages
Japanese (ja)
Other versions
JPS6120178B2 (en
Inventor
Koichi Oota
Susumu Hanaoka
Akihiko Ichikawa
Toshiyuki Sakai
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 JP55177093A priority Critical patent/JPS57101443A/en
Publication of JPS57101443A publication Critical patent/JPS57101443A/en
Publication of JPS6120178B2 publication Critical patent/JPS6120178B2/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
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Control Of Voltage And Current In General (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To provide a compensating means so that the temperature compensation can be made independently of on/off of an AGC. CONSTITUTION:An optical signal subjected to electrooptic conversion is applied to a photoelectric converter 13 via an optical fiber 12. Simutaneously, a pilot signal is superimposed on the optical signal from an oscillator 14. The pilot signal is picked up from an output of the converter 13 at a filter 15 and applied to a bias controlling circuit 18 via an amplifier 16 and a rectifying circuit 17. The output is a bias controlling voltage to the converter 13. A signal from the circuit 17 is compared with a reference voltage Vref at an operational amplifier and a voltage V2 is outputted. The detection of temperature variance is made at a diode D and amplified at the operational amplifier as a voltage V1. Both the voltages are added and amplified to obtain a bias controlling voltage (e).
JP55177093A 1980-12-17 1980-12-17 Bias controlling circuit Granted JPS57101443A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55177093A JPS57101443A (en) 1980-12-17 1980-12-17 Bias controlling circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55177093A JPS57101443A (en) 1980-12-17 1980-12-17 Bias controlling circuit

Publications (2)

Publication Number Publication Date
JPS57101443A true JPS57101443A (en) 1982-06-24
JPS6120178B2 JPS6120178B2 (en) 1986-05-21

Family

ID=16025002

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55177093A Granted JPS57101443A (en) 1980-12-17 1980-12-17 Bias controlling circuit

Country Status (1)

Country Link
JP (1) JPS57101443A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60111540A (en) * 1983-11-21 1985-06-18 Nec Corp Temperature compensating circuit of apd

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0381066U (en) * 1989-12-11 1991-08-20

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60111540A (en) * 1983-11-21 1985-06-18 Nec Corp Temperature compensating circuit of apd
JPH0345940B2 (en) * 1983-11-21 1991-07-12 Nippon Electric Co

Also Published As

Publication number Publication date
JPS6120178B2 (en) 1986-05-21

Similar Documents

Publication Publication Date Title
ES2103344T3 (en) GAIN CONTROL AMPLIFIER.
EP0382373A3 (en) Nonlinear noninverting transimpedance amplifier
JPS57101443A (en) Bias controlling circuit
SE8604821L (en) FINAL STEP WITH AUTOMATIC LEVEL CONTROL FOR NETWORK SIGNAL
DK573785A (en) CIRCUIT TO INCREASE THE DYNAMIC AREA IN AN INTEGRATING OPTICAL ELECTRIC RECEIVER
GB1529499A (en) Photo-amplifier
JPS582711A (en) Sensitivity stabilizing method for photoelectric transducer
SU1237167A1 (en) Amplifier of biopotentials with optical isolation
JPS6437133A (en) Optical reception circuit
JPS57141160A (en) Optical receiver
JPS56147533A (en) Light receiving and amplifying circuit
JPS57150209A (en) Automatic gain controlling circuit of optical signal
ES479554A1 (en) Pilot controlled repeater for analogue transmission system - automatically compensates for changes in analogue signal level
JPS56169443A (en) Detecting circuit for input signal interruption
JPS5450203A (en) Transmitter for optical fiber communication
JPS5797691A (en) Bias circuit for laser diode
JPS57142031A (en) Photoelectric conversion circuit
JPS5717207A (en) Amplifying circuit
JPS57147291A (en) Light transmission circuit
JPS57212839A (en) Detecting circuit for intermission of input signal for optical agc amplifier
JPS57190434A (en) Photodetecting circuit
JPS5524683A (en) Optical signal monitor
JPS5750156A (en) Am detection system
JPS55114917A (en) Agc circuit
JPS6418304A (en) Preamplifier