Optical multiplexing/demultiplexing device

摘要

A circulator guides wavelength multiplexed light that is received from a main transmission path to a 1st fiber grating. The 1st fiber grating reflects light of wavelength lambd1. Wavelength multiplexed light that has passed through the 1st fiber grating is guided to a 2nd fiber grating. The 2nd fiber grating reflects light of wavelength lambdn. The circulator guides the signal light that has been reflected from the 1st and 2nd fiber gratings to a branch transmission path. The length of the transmission path between the 1st and 2nd fiber gratings is determined based on the transmission rate or frequency of the signal that is transmitted using light of wavelength lambdn.