Signal optical loss detection device, optical amplifier, optical wavelength multiplex transmission device, optical wavelength multiplex transmission system

摘要

The signal light interruption detecting device (35) divides the wavelength multiplexed light into light of a first frequency range corresponding to a first frequency grid including frequencies of equal frequency intervals at which main signal light components can be arranged and light of a first frequency range An optical interleaver (352) for demultiplexing the frequency grid and light in a second frequency range corresponding to a second frequency grid shifted by a half period of the equal frequency interval from the frequency grid; A first photodetector (353) for detecting a first optical power which is the sum of the first optical power in the first frequency range, a second optical detector for detecting the second optical power, (354), a notification signal based on a difference between the first optical power detected by the first optical detector (353) and the second optical power detected by the second optical detector (354) And a judging section (355) for outputting the judgment result.