JPS5690612A - Gain control system of light signal observation device - Google Patents

Gain control system of light signal observation device

Info

Publication number
JPS5690612A
JPS5690612A JP16863179A JP16863179A JPS5690612A JP S5690612 A JPS5690612 A JP S5690612A JP 16863179 A JP16863179 A JP 16863179A JP 16863179 A JP16863179 A JP 16863179A JP S5690612 A JPS5690612 A JP S5690612A
Authority
JP
Japan
Prior art keywords
broad
band
light signal
input signal
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.)
Pending
Application number
JP16863179A
Other languages
Japanese (ja)
Inventor
Kozo Uchida
Takashi Matsuno
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.)
Iwatsu Electric Co Ltd
Original Assignee
Iwatsu 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 Iwatsu Electric Co Ltd filed Critical Iwatsu Electric Co Ltd
Priority to JP16863179A priority Critical patent/JPS5690612A/en
Publication of JPS5690612A publication Critical patent/JPS5690612A/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
    • H03G3/02—Manually-operated control

Landscapes

  • Control Of Amplification And Gain Control (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To enable wide gain switching while maintaining broad-band characteristics, by providing stages of circuits controlling gains by alternating a broad-band amplifier and alternative circuit, and then by switching them selectively. CONSTITUTION:Light signal beam 204 inputted via optical fiber, etc., is photoelectrically converted by light signal input device 203 and then inputted to gain switching device 300 via coaxial cable 220B. When the input signal to gain switching device 300 is small and a high gain is required, broad-band signal switches 301A, 302A, 301B, and 302B are so changed over that the input signal may be amplified by broad-band amplifiers 304A and 304B. Changing over switches are selectively performed with a sensitive change-over switch corresponding to the magnitude of the input signal.
JP16863179A 1979-12-25 1979-12-25 Gain control system of light signal observation device Pending JPS5690612A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16863179A JPS5690612A (en) 1979-12-25 1979-12-25 Gain control system of light signal observation device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16863179A JPS5690612A (en) 1979-12-25 1979-12-25 Gain control system of light signal observation device

Publications (1)

Publication Number Publication Date
JPS5690612A true JPS5690612A (en) 1981-07-22

Family

ID=15871619

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16863179A Pending JPS5690612A (en) 1979-12-25 1979-12-25 Gain control system of light signal observation device

Country Status (1)

Country Link
JP (1) JPS5690612A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4910478A (en) * 1988-06-10 1990-03-20 Mitsubishi Denki Kabushiki Kaisha Amplifier circuit and method of controlling output power thereof
US5008631A (en) * 1989-08-16 1991-04-16 Hewlett-Packard Company Pulse analyzer with gain compression
US6172559B1 (en) 1998-02-27 2001-01-09 Nec Corporation Variable gain amplifying device
JP2008227712A (en) * 2007-03-09 2008-09-25 Ricoh Co Ltd Variable gain amplifier circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4910478A (en) * 1988-06-10 1990-03-20 Mitsubishi Denki Kabushiki Kaisha Amplifier circuit and method of controlling output power thereof
US5008631A (en) * 1989-08-16 1991-04-16 Hewlett-Packard Company Pulse analyzer with gain compression
US6172559B1 (en) 1998-02-27 2001-01-09 Nec Corporation Variable gain amplifying device
JP2008227712A (en) * 2007-03-09 2008-09-25 Ricoh Co Ltd Variable gain amplifier circuit

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