JPS57168513A - Automatic gain controlling system of optical receiver - Google Patents

Automatic gain controlling system of optical receiver

Info

Publication number
JPS57168513A
JPS57168513A JP56054159A JP5415981A JPS57168513A JP S57168513 A JPS57168513 A JP S57168513A JP 56054159 A JP56054159 A JP 56054159A JP 5415981 A JP5415981 A JP 5415981A JP S57168513 A JPS57168513 A JP S57168513A
Authority
JP
Japan
Prior art keywords
voltage
output
amplifier
output current
gain
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
JP56054159A
Other languages
Japanese (ja)
Inventor
Toshio Takeshi
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP56054159A priority Critical patent/JPS57168513A/en
Publication of JPS57168513A publication Critical patent/JPS57168513A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3084—Automatic control in amplifiers having semiconductor devices in receivers or transmitters for electromagnetic waves other than radiowaves, e.g. lightwaves

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To attain the simplification and the miniaturization of a device, by detecting the mean value of the output current of a PIN photodiode and then securing an automatic control for the gain of a receiving amplifier. CONSTITUTION:The output current of a PIN photodiode 2 is amplified by both the manual and automatic gain amplifiers 3 and 4, and the initial set output emerges at an output terminal 6. At the same time, the same output current is extracted also out of the cathode side of the diode 2 and integrated by an integrator 11 to be applied to a differential amplifier 12 in the form of the DC voltage. With the fluctuation of the DC voltage, the AC of the output current to be applied to the amplifier 3 has a change of the same ratio as the fluctuation of the DC voltage. Thereofore the reference voltage 9 is set so that the output voltage of the terminal 6 is set at the initial value. If the level of an optical input signal 1 lowers after setting the voltage 9, the output voltage of the integrator 11 lowers. As a result, the output voltage of the amplifier 12 varies to increase the gain of the amplifier 4 to extremely reduce the change of the output signal voltage. The output signal voltage is also set constant even in case when the level of the signal 1 increases.
JP56054159A 1981-04-09 1981-04-09 Automatic gain controlling system of optical receiver Pending JPS57168513A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56054159A JPS57168513A (en) 1981-04-09 1981-04-09 Automatic gain controlling system of optical receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56054159A JPS57168513A (en) 1981-04-09 1981-04-09 Automatic gain controlling system of optical receiver

Publications (1)

Publication Number Publication Date
JPS57168513A true JPS57168513A (en) 1982-10-16

Family

ID=12962761

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56054159A Pending JPS57168513A (en) 1981-04-09 1981-04-09 Automatic gain controlling system of optical receiver

Country Status (1)

Country Link
JP (1) JPS57168513A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59137657U (en) * 1983-03-02 1984-09-13 松下電器産業株式会社 optical receiver
FR2566205A1 (en) * 1984-06-19 1985-12-20 Tonna Electronique Method of monitoring an attenuator/amplifier device with automatic gain control and optical receiver
JPS63276310A (en) * 1987-05-07 1988-11-14 Fujitsu Ltd Automatic gain control circuit
JPH0438194U (en) * 1990-07-27 1992-03-31
JPH04196929A (en) * 1990-11-28 1992-07-16 Nec Corp Automatic gain control circuit
JPH0856200A (en) 1994-08-12 1996-02-27 Miharu Tsushin Kk Agc method for optical receiver for catv
JP2006527545A (en) * 2003-06-06 2006-11-30 サイエンティフィック−アトランタ， インコーポレイテッド Optical receiver with open loop automatic gain control circuit

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59137657U (en) * 1983-03-02 1984-09-13 松下電器産業株式会社 optical receiver
FR2566205A1 (en) * 1984-06-19 1985-12-20 Tonna Electronique Method of monitoring an attenuator/amplifier device with automatic gain control and optical receiver
JPS63276310A (en) * 1987-05-07 1988-11-14 Fujitsu Ltd Automatic gain control circuit
JPH0438194U (en) * 1990-07-27 1992-03-31
JPH04196929A (en) * 1990-11-28 1992-07-16 Nec Corp Automatic gain control circuit
JPH0856200A (en) 1994-08-12 1996-02-27 Miharu Tsushin Kk Agc method for optical receiver for catv
JP2006527545A (en) * 2003-06-06 2006-11-30 サイエンティフィック−アトランタ， インコーポレイテッド Optical receiver with open loop automatic gain control circuit

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