Optical communications – Diagnostic testing – Fault detection
Reexamination Certificate
2005-08-24
2009-12-01
Vanderpuye, Ken N (Department: 2613)
Optical communications
Diagnostic testing
Fault detection
C398S009000, C398S010000, C398S011000, C398S012000, C398S014000, C398S016000, C398S017000, C398S018000, C398S025000, C398S034000, C398S037000, C398S038000, C398S083000
Reexamination Certificate
active
07627244
ABSTRACT:
An optical transmission apparatus comprises a preamplifier controlling unit for controlling a preamplifier so that amplified spontaneous emission including all wavelength bands of a wavelength-multiplexed signal beam is outputted toward a wavelength demultiplexing unit, with the wavelength-multiplexed signal beam not inputted, power monitors for monitoring optical powers of the amplified spontaneous emission fed from the preamplifier and wavelength-demultiplexed by the wavelength demultiplexing unit, and a determining unit for determining the continuity state of an optical propagation path of each wavelength component on the basis of a result of monitoring by the power monitors. The optical transmission apparatus allows the continuity test on optical propagation paths of channels including a channel not used at the time of a start of the operation to be made easier than the known techniques.
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European Search Report based on EP 05018472 (dated Dec. 2, 2008).
Dobson Daniel G
Fujitsu Limited
Hanify & King P.C.
Vanderpuye Ken N
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