JPH01130638A - Frequency multiplex optical two-way transmitter - Google Patents

Frequency multiplex optical two-way transmitter

Info

Publication number
JPH01130638A
JPH01130638A JP29021187A JP29021187A JPH01130638A JP H01130638 A JPH01130638 A JP H01130638A JP 29021187 A JP29021187 A JP 29021187A JP 29021187 A JP29021187 A JP 29021187A JP H01130638 A JPH01130638 A JP H01130638A
Authority
JP
Grant status
Application
Patent type
Prior art keywords
light
return signal
frequency
optical
frequency multiplex
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
JP29021187A
Inventor
Takahiro Aoki
Katsumi Emura
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

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/29Repeaters
    • H04B10/291Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/2912Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing
    • H04B10/2916Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing using Raman or Brillouin amplifiers

Abstract

PURPOSE: To attain low cost and to improve reliability by applying Brillouin amplification so as to select a channel and using a return signal so as to modulate and send back excited light used for the Brillouin amplification thereby constituting a simple subscriber terminal equipment.
CONSTITUTION: A signal light subject to frequency multiplex by an optical multiplexer 2 is made incident in an optical fiber 3 through an optical demultiplexer 51. On the other hand, the excited light projected from a semiconductor laser 61 is modulated by a return signal fed to an electric signal input terminal 62 of an intensity modulator 63 and coupled with an optical fiber 3 by an optical demultiplexer 72. The oscillated frequency of the semiconductor laser 61 is set higher than the frequency of a prescribed channel by the Brillouin shift by a control section 81. Then a photoreception section 71 reads the return signal by using the excited light, that is, the return signal light. Thus, no optical demultiplexer for frequency multiplex light is required at the subscriber terminal equipment and one light source is enough for the system, then the network with low cost and high reliability can be constituted.
COPYRIGHT: (C)1989,JPO&Japio
JP29021187A 1987-11-16 1987-11-16 Frequency multiplex optical two-way transmitter Pending JPH01130638A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP29021187A JPH01130638A (en) 1987-11-16 1987-11-16 Frequency multiplex optical two-way transmitter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP29021187A JPH01130638A (en) 1987-11-16 1987-11-16 Frequency multiplex optical two-way transmitter

Publications (1)

Publication Number Publication Date
JPH01130638A true true JPH01130638A (en) 1989-05-23

Family

ID=17753186

Family Applications (1)

Application Number Title Priority Date Filing Date
JP29021187A Pending JPH01130638A (en) 1987-11-16 1987-11-16 Frequency multiplex optical two-way transmitter

Country Status (1)

Country Link
JP (1) JPH01130638A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0342637A (en) * 1989-07-10 1991-02-22 Furukawa Electric Co Ltd:The Optical signal amplification system
US5515192A (en) * 1992-03-19 1996-05-07 Fujitsu Limited Optical systems making use of phenomenon of stimulated brillouin scattering
JPH08331060A (en) * 1996-06-10 1996-12-13 Fujitsu Ltd Optical transmitter, optical communication system and method for transmitting optical signal
JPH08331059A (en) * 1996-06-10 1996-12-13 Fujitsu Ltd Optical transmitter, optical communication system and method for amplifying optical signal
JP2014068092A (en) * 2012-09-25 2014-04-17 Nippon Telegr & Teleph Corp <Ntt> Optical communication system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5884550A (en) * 1981-11-16 1983-05-20 Nec Corp Optical fiber bidirectional transmission system
JPS63179633A (en) * 1987-01-21 1988-07-23 Nippon Telegr & Teleph Corp <Ntt> Optical communication system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5884550A (en) * 1981-11-16 1983-05-20 Nec Corp Optical fiber bidirectional transmission system
JPS63179633A (en) * 1987-01-21 1988-07-23 Nippon Telegr & Teleph Corp <Ntt> Optical communication system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0342637A (en) * 1989-07-10 1991-02-22 Furukawa Electric Co Ltd:The Optical signal amplification system
JP2749645B2 (en) * 1989-07-10 1998-05-13 古河電気工業株式会社 Optical signal amplification method
US5515192A (en) * 1992-03-19 1996-05-07 Fujitsu Limited Optical systems making use of phenomenon of stimulated brillouin scattering
US5598289A (en) * 1992-03-19 1997-01-28 Fujitsu Limited Optical systems making use of phenomenon of stimulated brillouin scattering
JPH08331060A (en) * 1996-06-10 1996-12-13 Fujitsu Ltd Optical transmitter, optical communication system and method for transmitting optical signal
JPH08331059A (en) * 1996-06-10 1996-12-13 Fujitsu Ltd Optical transmitter, optical communication system and method for amplifying optical signal
JP2014068092A (en) * 2012-09-25 2014-04-17 Nippon Telegr & Teleph Corp <Ntt> Optical communication system

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