Light intensity distribution pattern measuring device and method

A light intensity distribution pattern measurement device comprising:

• a first light source for outputting first continuous light;
• a second light source for outputting second continuous light as local light;
• a two-dimensional imaging sensor for receiving multiplexed light obtained by multiplexing transmitted light that is obtained by injecting one branched light of the first continuous light into an optical fiber under measurement, reference light that is the other branched light of the first continuous light, and the local light;
• a processor;
• and
• a storage medium having computer program instructions stored thereon, when executed by the processor, perform:
• digital signal processing on a light reception signal I (t) of each pixel obtained by the two-dimensional imaging sensor, and
• measures a light intensity distribution pattern by calculating a square of an autocorrelation function between the light reception signal I (t) and a light reception signal I (τ+T) obtained by shifting the light reception signal by time τ for each pixel of the two-dimensional imaging sensor.