Optical communication way station side device, subscriber-side device, and optical communication system,

摘要

PPROBLEM TO BE SOLVED: To provide an OLT, an ONU, an optical communication system and an optical communication method, such that an influence of reflection of supply light can be avoided in an optical access network which uses the supply light from the OLT as an up optical signal, without using an amplifier which has a high saturation output and a high amplification factor. PSOLUTION: The OLT 200 includes a station-side optical transmission and reception circuit which transmits and receives optical signals to and from the ONU in a wavelength-division multiplex manner, a light source 22 which supplies the supply light for up optical signal to the ONU, a controller (not illustrated) which controls intermittence of the output of the light source 22 and transmission permission to the ONU, and an optical multiplexer demultiplexer which connects the light source 22 and an optical receiver 20 to an optical transmission line 50. PCOPYRIGHT: (C)2011,JPO&INPIT