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JPS5580936A - Optical receiving circuit - Google Patents

Optical receiving circuit

Info

Publication number
JPS5580936A
JPS5580936A JP15513578A JP15513578A JPS5580936A JP S5580936 A JPS5580936 A JP S5580936A JP 15513578 A JP15513578 A JP 15513578A JP 15513578 A JP15513578 A JP 15513578A JP S5580936 A JPS5580936 A JP S5580936A
Authority
JP
Japan
Prior art keywords
output
amplifier
transistor
receiving circuit
optical receiving
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
JP15513578A
Other languages
Japanese (ja)
Inventor
Haruo Fujiwara
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 JP15513578A priority Critical patent/JPS5580936A/en
Publication of JPS5580936A publication Critical patent/JPS5580936A/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
    • H04B10/693—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)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To increase both the S/N and the maximum light reception level by giving the control via part of the reception output to the emitter voltage of the transistor which amplifies the output of the photo detection diode. CONSTITUTION:The signal detected through photo detection diode DP is amplified by amplifier 1 and via low-noise transistor Q1. Part of output 10 is turned into DC voltage VDC via peak detection circuit 2 and then applied to differential amplifier 11 along with reference voltage VS. The output of amplifier 11 is applied to AGC terminal 20 of amplifier 1 as well as to transistor Q2 which controls the emitter current of Q1. As a result, the emitter current of Q1 has fluctuation in accordance with the size of the optical input signal, thus forming an optical receiving circuit featuring a large dynamic range.
JP15513578A 1978-12-14 1978-12-14 Optical receiving circuit Pending JPS5580936A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15513578A JPS5580936A (en) 1978-12-14 1978-12-14 Optical receiving circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15513578A JPS5580936A (en) 1978-12-14 1978-12-14 Optical receiving circuit

Publications (1)

Publication Number Publication Date
JPS5580936A true JPS5580936A (en) 1980-06-18

Family

ID=15599309

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15513578A Pending JPS5580936A (en) 1978-12-14 1978-12-14 Optical receiving circuit

Country Status (1)

Country Link
JP (1) JPS5580936A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61195648U (en) * 1985-05-29 1986-12-05
JPS6393230A (en) * 1986-09-24 1988-04-23 アーテー・エン・テー・アンド・フィリップス・テレコミュニケイシオンズ・ベー・ヴェー Optical preamplifier
JPH021634A (en) * 1989-04-19 1990-01-05 Hitachi Ltd Light-receiving circuit
KR100890293B1 (en) * 2004-08-18 2009-03-26 로무 가부시키가이샤 Gain adjustment circuit, signal processing circuit, and electric device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61195648U (en) * 1985-05-29 1986-12-05
JPS6393230A (en) * 1986-09-24 1988-04-23 アーテー・エン・テー・アンド・フィリップス・テレコミュニケイシオンズ・ベー・ヴェー Optical preamplifier
JPH021634A (en) * 1989-04-19 1990-01-05 Hitachi Ltd Light-receiving circuit
KR100890293B1 (en) * 2004-08-18 2009-03-26 로무 가부시키가이샤 Gain adjustment circuit, signal processing circuit, and electric device

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