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Title:
OPTICAL TRANSMISSION MONITORING AND OPTICAL TRANSMISSION SYSTEM
Document Type and Number:
Japanese Patent JP3885390
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To provide an optical transmission monitor of a simple configuration that identifies a cause of strength fluctuations in multi-wavelength signal light.
SOLUTION: Part of light received by an optical transmission monitor 31 is extracted by an optical branching element 311 and detected by a photodetector 313. The light received by the photodetector 313 includes ASE noise light in addition to 8 wavelength signals λ1-λ8. Furthermore, part of the light received by the optical transmission monitor 31 is extracted by an optical branching element 312 and light of a wavelength band including 4 sets of wavelength λ5-λ8 passes through an optical fiber grating 314 and detected by a detector 315. The light at the optical wavelength band received by the photodetector 315 includes ASE noise light at a signal light wavelength band in addition to the signal light with 4 wavelength sets λ5-λ8. A monitor section 316 compares a rate of change in the strength of light detected by the photo detectors 313, 315 respectively and monitors light transmission based on the result of comparison.


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Inventors:
Koji Nakazato
Application Number:
JP31652398A
Publication Date:
February 21, 2007
Filing Date:
November 06, 1998
Export Citation:
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Assignee:
Sumitomo Electric Industries, Ltd.
International Classes:
H04J14/00; H04B3/46; H04B3/48; H04B10/07; H04B10/079; H04B10/294; H04B17/00; H04J14/02; (IPC1-7): H04B10/08; H04J14/00; H04J14/02; H04B17/00
Domestic Patent References:
JP8304859A
JP10009961A
JP5211482A
JP11225115A
JP11186962A
JP9247104A
JP11202374A
JP6132905A
Attorney, Agent or Firm:
Yoshiki Hasegawa
Tatsuya Shioda
Shiro Terasaki
Yuichi Yamada
Masatoshi Shibata



 
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