JPS57150209A - Automatic gain controlling circuit of optical signal - Google Patents

Automatic gain controlling circuit of optical signal

Info

Publication number
JPS57150209A
JPS57150209A JP56036110A JP3611081A JPS57150209A JP S57150209 A JPS57150209 A JP S57150209A JP 56036110 A JP56036110 A JP 56036110A JP 3611081 A JP3611081 A JP 3611081A JP S57150209 A JPS57150209 A JP S57150209A
Authority
JP
Japan
Prior art keywords
increases
optical
intensity modulator
optical fiber
output
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
JP56036110A
Other languages
Japanese (ja)
Inventor
Tadayoshi Kitayama
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 JP56036110A priority Critical patent/JPS57150209A/en
Publication of JPS57150209A publication Critical patent/JPS57150209A/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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/0121—Operation of devices; Circuit arrangements, not otherwise provided for in this subclass
    • G02F1/0123—Circuits for the control or stabilisation of the bias voltage, e.g. automatic bias control [ABC] feedback loops

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To prevent damage or saturation of a photodetecting element, and to expand the gain control range, by constituting so that a photodetecting level of the photodetecting element becomes constant by inserting an optical intensity modulator between an optical fiber and the photodetecting element. CONSTITUTION:An optical intensity modulator 10 is formed by an electrooptic crystal, etc., and is operated so that the higher the control voltage supplied from a high voltage DC amplifier 9 becomes, the lower the transmittivity of an output light beam of an optical fiber 1 to a photodiode 2 becomes. When an output of the optical fiber 1 increases, the output voltage of a peak detector 6 increases, the output voltage of a differential amplifier 7 and the high voltage DC amplifier 9 increases, the transmittivity of the optical intensity modulator 10 drops, the negative feedback is provided, and an optical input level to the photodiode 2 and output voltage to a terminal 5 are controlled to a constant value.
JP56036110A 1981-03-11 1981-03-11 Automatic gain controlling circuit of optical signal Pending JPS57150209A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56036110A JPS57150209A (en) 1981-03-11 1981-03-11 Automatic gain controlling circuit of optical signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56036110A JPS57150209A (en) 1981-03-11 1981-03-11 Automatic gain controlling circuit of optical signal

Publications (1)

Publication Number Publication Date
JPS57150209A true JPS57150209A (en) 1982-09-17

Family

ID=12460622

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56036110A Pending JPS57150209A (en) 1981-03-11 1981-03-11 Automatic gain controlling circuit of optical signal

Country Status (1)

Country Link
JP (1) JPS57150209A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6128243A (en) * 1984-05-04 1986-02-07 スタンダ−ド・エレクトリツク・ロ−レンツ・アクチエンゲゼルシヤフト Light receiver
CN117031794A (en) * 2023-10-09 2023-11-10 华中科技大学 Dynamic channel equalization filter and optical fiber communication system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6128243A (en) * 1984-05-04 1986-02-07 スタンダ−ド・エレクトリツク・ロ−レンツ・アクチエンゲゼルシヤフト Light receiver
CN117031794A (en) * 2023-10-09 2023-11-10 华中科技大学 Dynamic channel equalization filter and optical fiber communication system
CN117031794B (en) * 2023-10-09 2023-12-26 华中科技大学 Dynamic channel equalization filter and optical fiber communication system

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