| http://www.w3.org/ns/prov#value | - Therefore, there is a problem in that that quality of signal light cannot be monitored.SUMMARY OF THE INVENTIONIt is an object of the present invention to at least solve the above problems in the conventional technologies.An optical-phase monitoring apparatus according to one aspect of the present invention includes an optical switch that multiplexes signal light and a control optical pulse, and t
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