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JPS6439838A - Optical heterodyne receiver - Google Patents

Optical heterodyne receiver

Info

Publication number
JPS6439838A
JPS6439838A JP62195375A JP19537587A JPS6439838A JP S6439838 A JPS6439838 A JP S6439838A JP 62195375 A JP62195375 A JP 62195375A JP 19537587 A JP19537587 A JP 19537587A JP S6439838 A JPS6439838 A JP S6439838A
Authority
JP
Japan
Prior art keywords
intermediate frequency
local oscillation
signal
frequency
light source
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
JP62195375A
Other languages
Japanese (ja)
Inventor
Katsumi Emura
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
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 filed Critical NEC Corp
Priority to JP62195375A priority Critical patent/JPS6439838A/en
Publication of JPS6439838A publication Critical patent/JPS6439838A/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

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

PURPOSE:To enlarge a dynamic range of a light receiving part by providing a control part for controlling the intensity of a local oscillation light source in accordance with the intensity of a signal light, and simultaneously, stabilizing a center frequency of an intermediate frequency signal by controlling an oscillation frequency of the local oscillation light source. CONSTITUTION:A signal light 1 and a local oscillation light 3 being an output from a local oscillation light source 2 are multiplexed by an optical multiplexing part 4, and an intermediate frequency signal 7 is formed. The obtained intermediate frequency signal 7 is further amplified by an intermediate frequency amplifier 8, and thereafter, allowed to branch into two, and one of them is inputted to a frequency discriminator 9 and used for controlling an intermediate frequency. The intermediate frequency is controlled by the first control part 31, a signal corresponding to a shift from a prescribed intermediate frequency is obtained by the frequency discriminator 9, and by feeding back its output to an injection current to a phase control area and a distribution and reflection area of the local oscillation light source 2, the intermediate frequency is stabilized. In such away, a dynamic range of a receiving part can be enlarged.
JP62195375A 1987-08-06 1987-08-06 Optical heterodyne receiver Pending JPS6439838A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62195375A JPS6439838A (en) 1987-08-06 1987-08-06 Optical heterodyne receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62195375A JPS6439838A (en) 1987-08-06 1987-08-06 Optical heterodyne receiver

Publications (1)

Publication Number Publication Date
JPS6439838A true JPS6439838A (en) 1989-02-10

Family

ID=16340122

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62195375A Pending JPS6439838A (en) 1987-08-06 1987-08-06 Optical heterodyne receiver

Country Status (1)

Country Link
JP (1) JPS6439838A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0346839A (en) * 1989-07-14 1991-02-28 Nec Corp Spatial light transmission system
JP2013046162A (en) * 2011-08-23 2013-03-04 Nec Corp Coherent optical reception device and coherent optical reception method
JP2015084594A (en) * 2011-01-20 2015-04-30 日本電気株式会社 Coherent light receiver and coherent light receiving method
US10481464B2 (en) 2015-04-28 2019-11-19 Sumitomo Osaka Cement Co., Ltd. Optical modulator with wirings of equal length

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0346839A (en) * 1989-07-14 1991-02-28 Nec Corp Spatial light transmission system
JP2015084594A (en) * 2011-01-20 2015-04-30 日本電気株式会社 Coherent light receiver and coherent light receiving method
US10389440B2 (en) 2011-01-20 2019-08-20 Nec Corporation Coherent optical receiver device and coherent optical receiving method
US10608738B2 (en) 2011-01-20 2020-03-31 Nec Corporation Coherent optical receiver device and coherent optical receiving method
JP2013046162A (en) * 2011-08-23 2013-03-04 Nec Corp Coherent optical reception device and coherent optical reception method
US10481464B2 (en) 2015-04-28 2019-11-19 Sumitomo Osaka Cement Co., Ltd. Optical modulator with wirings of equal length

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