JPS5715544A - Automatic threshold value control system for optical communication receiving system - Google Patents

Automatic threshold value control system for optical communication receiving system

Info

Publication number
JPS5715544A
JPS5715544A JP9088280A JP9088280A JPS5715544A JP S5715544 A JPS5715544 A JP S5715544A JP 9088280 A JP9088280 A JP 9088280A JP 9088280 A JP9088280 A JP 9088280A JP S5715544 A JPS5715544 A JP S5715544A
Authority
JP
Japan
Prior art keywords
wave length
light
threshold value
level
signal light
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
JP9088280A
Other languages
Japanese (ja)
Other versions
JPS6040223B2 (en
Inventor
Toru Azuma
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP55090882A priority Critical patent/JPS6040223B2/en
Publication of JPS5715544A publication Critical patent/JPS5715544A/en
Publication of JPS6040223B2 publication Critical patent/JPS6040223B2/en
Expired 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
    • 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
    • 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
    • H04B10/691—Arrangements for optimizing the photodetector in the receiver
    • H04B10/6911—Photodiode bias control, e.g. for compensating temperature variations

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Light Receiving Elements (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To achieve a wide dynamic range without being affected by a noise background light other than a signal light, by comparing an external noise light level and a signal light level and controlling the threshold value of an identifying reproducing device. CONSTITUTION:A light passing through an optical filter 11 in a short wave length cut interrupting a signal light wave length is made photoelectric conversion and amplified, and an external light level is measured with a peak detector 18 consisting of a low pass filter. On the other hand, a light passing through an optical filter 21 in a short wave length cut interrupting shorter wave length than the signal light wave length is also made photo electric conversion and amplified with an APD22 as photo detecting element, and after amplification at a preamplifier 23 and a main amplifier 24, it is applied to a peak detector consisting of a low pass filter through an equalizer 25 to obtain an output level. Said output level is compared with the external light level at a comparator 29 to exercise control for optimum threshold value.
JP55090882A 1980-07-02 1980-07-02 Automatic threshold control method for optical communication receiving system Expired JPS6040223B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55090882A JPS6040223B2 (en) 1980-07-02 1980-07-02 Automatic threshold control method for optical communication receiving system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55090882A JPS6040223B2 (en) 1980-07-02 1980-07-02 Automatic threshold control method for optical communication receiving system

Publications (2)

Publication Number Publication Date
JPS5715544A true JPS5715544A (en) 1982-01-26
JPS6040223B2 JPS6040223B2 (en) 1985-09-10

Family

ID=14010807

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55090882A Expired JPS6040223B2 (en) 1980-07-02 1980-07-02 Automatic threshold control method for optical communication receiving system

Country Status (1)

Country Link
JP (1) JPS6040223B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07193546A (en) * 1993-12-27 1995-07-28 Nec Corp Light-receiving circuit
JP2009027480A (en) * 2007-07-19 2009-02-05 Toyota Central R&D Labs Inc Optical communication device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0532017Y2 (en) * 1987-07-31 1993-08-17

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07193546A (en) * 1993-12-27 1995-07-28 Nec Corp Light-receiving circuit
JP2009027480A (en) * 2007-07-19 2009-02-05 Toyota Central R&D Labs Inc Optical communication device

Also Published As

Publication number Publication date
JPS6040223B2 (en) 1985-09-10

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