CPC G01M 11/333 (2013.01) [G01M 11/335 (2013.01); G02B 6/02042 (2013.01)] | 13 Claims |
1. A mode-dependent loss measurement device configured to measure a mode-dependent loss of a measurement target optical fiber including a coupled multi-core optical fiber having a plurality of cores extending along a fiber axis and a common cladding surrounding the plurality of cores, the device comprising:
a light source configured to be optically coupled with an input end of an excitation optical fiber including a coupled multi-core optical fiber having a plurality of cores extending along a fiber axis and a cladding surrounding the plurality of cores, the light source configured to input light to the input end of the excitation optical fiber;
a light receiver optically coupled with an output end of the measurement target optical fiber, the light receiver detecting a sum of powers of outputted light beams from a plurality of core end faces positioned on the output end of the measurement target optical fiber during a period in which the light from the light source is inputted to the input end of the excitation optical fiber in a state in which an output end of the excitation optical fiber and an input end of the measurement target optical fiber are optically coupled with each other;
a mode coupled state change means for changing a mode coupled state of the excitation optical fiber; and
an analysis unit comprising a CPU and a memory configured to analyze variations in optical powers detected by the light receiver during a period in which the mode coupled state of the excitation optical fiber is changing, and obtain the mode-dependent loss of the measurement target optical fiber from the variations in the detected optical powers.
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