Optical communication device, wavelength number measurement device, optical repeater, and wavelength number measurement method

A wavelength number measuring device comprising:

• a light source capable of varying the wavelength of light to be output;
• an optical multiplexer configured to multiplex light output from the light source with signal light received from a transmission path;
• an optical medium to which light output from the optical multiplexer is input;
• a monitor configured to monitor light having a predetermined wavelength output from the optical medium;
• and
• a wavelength number measuring unit configured to measure the number of wavelengths of signal light transmitted through the transmission path based on the result of monitoring by the monitor.

An optical repeater comprising:

• a light source capable of varying the wavelength of light to be output;
• a wavelength controller configured to control the wavelength of the light source;
• an optical multiplexer configured to multiplex light output from the light source with signal light received from a transmission path;
• an optical medium to which light output from the optical multiplexer is input;
• a monitor configured to monitor light having a predetermined wavelength output from the optical medium;
• and
• a wavelength number measuring unit configured to measure the number of wavelengths of signal light transmitted through the transmission path based on the result of monitoring by the monitor.

A wavelength number measurement method comprising:

• multiplexing light output from a light source with signal light received from a transmission path;
• causing the multiplexed light to enter an optical medium;
• monitoring light having a predetermined wavelength output from the optical medium;
• and
• measuring the number of wavelengths of signal light transmitted through the transmission path based on the result of monitoring.