Light-transmission-path-spectrum measurement device, light-transmission-path system, and computer-readable medium

A light-transmission-path-spectrum measurement device, comprising:

• wavelength varying OTDR measurement unit configured to vary and generate a wavelength of measurement light to be transmitted to a first light transmission path, and also to measure return light acquired from the measurement light being returned, by a repeater connected to the first light transmission path, via a second light transmission path connected to the repeater;
• optical signal multiplexing unit configured to select the wavelength of the measurement light being generated by the wavelength varying OTDR measurement unit, and to output the selected wavelength to the first light transmission path;
• control unit configured to control the wavelength of the measurement light being generated by the wavelength varying OTDR measurement unit and the wavelength of the measurement light being selected by the optical signal multiplexing unit;
• and
• measurement data processing unit configured to process measurement data about the return light being measured by the wavelength varying OTDR measurement unit.