GB2326041B - Optical receiving apparatus - Google Patents

Optical receiving apparatus

Info

Publication number
GB2326041B
GB2326041B GB9819054A GB9819054A GB2326041B GB 2326041 B GB2326041 B GB 2326041B GB 9819054 A GB9819054 A GB 9819054A GB 9819054 A GB9819054 A GB 9819054A GB 2326041 B GB2326041 B GB 2326041B
Authority
GB
United Kingdom
Prior art keywords
optical signal
optical
receiving apparatus
signal
modulated
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.)
Expired - Fee Related
Application number
GB9819054A
Other versions
GB2326041A (en
GB9819054D0 (en
Inventor
Yuji Tamura
Hiroyuki Itou
Tsukasa Takahashi
Michikazu Shima
Yumiko Kawasaki
Kazuo Yamane
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
Priority claimed from JP6138479A external-priority patent/JPH088835A/en
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Publication of GB9819054D0 publication Critical patent/GB9819054D0/en
Publication of GB2326041A publication Critical patent/GB2326041A/en
Application granted granted Critical
Publication of GB2326041B publication Critical patent/GB2326041B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/2912—Repeaters 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
    • 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
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
    • 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
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • 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
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/293—Signal power control
    • H04B10/2931—Signal power control using AGC
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2210/00—Indexing scheme relating to optical transmission systems
    • H04B2210/07—Monitoring an optical transmission system using a supervisory signal
    • H04B2210/078—Monitoring an optical transmission system using a supervisory signal using a separate wavelength

Landscapes

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

Abstract

An optical receiving apparatus comprising an optical branching device for separating an optical signal, containing a main optical signal and spontaneously emitted light modulated with an auxiliary signal, into a first optical signal containing the main optical signal and a second optical signal containing the modulated spontaneously emitted light; and demodulating means for performing demodulation to recover the auxiliary signal from the second optical signal. The optical branching device is an optical wavelength-division demultiplexer for separating the optical signal into the first optical signal containing the main optical signal and the second optical signal containing the modulated spontaneously emitted light but substantially not containing the main optical signal. A transmission system including the receiving apparatus is also disclosed.
GB9819054A 1994-06-21 1995-02-16 Optical receiving apparatus Expired - Fee Related GB2326041B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP6138479A JPH088835A (en) 1994-06-21 1994-06-21 Optical transmission system
GB9503029A GB2290670B (en) 1994-06-21 1995-02-16 Auxiliary-signal transmission system

Publications (3)

Publication Number Publication Date
GB9819054D0 GB9819054D0 (en) 1998-10-28
GB2326041A GB2326041A (en) 1998-12-09
GB2326041B true GB2326041B (en) 1999-01-20

Family

ID=26306512

Family Applications (3)

Application Number Title Priority Date Filing Date
GB9818894A Expired - Fee Related GB2326548B (en) 1994-06-21 1995-02-16 Optical transmission apparatus
GB9819054A Expired - Fee Related GB2326041B (en) 1994-06-21 1995-02-16 Optical receiving apparatus
GB9819053A Expired - Fee Related GB2326040B (en) 1994-06-21 1995-02-16 Optical receiving apparatus

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB9818894A Expired - Fee Related GB2326548B (en) 1994-06-21 1995-02-16 Optical transmission apparatus

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB9819053A Expired - Fee Related GB2326040B (en) 1994-06-21 1995-02-16 Optical receiving apparatus

Country Status (1)

Country Link
GB (3) GB2326548B (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2245121A (en) * 1990-06-16 1991-12-18 Stc Plc Telemetry

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2245121A (en) * 1990-06-16 1991-12-18 Stc Plc Telemetry

Also Published As

Publication number Publication date
GB2326548B (en) 1999-03-10
GB2326041A (en) 1998-12-09
GB2326548A (en) 1998-12-23
GB9818894D0 (en) 1998-10-21
GB2326040A (en) 1998-12-09
GB9819054D0 (en) 1998-10-28
GB2326040B (en) 1999-01-20
GB9819053D0 (en) 1998-10-28

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20010216