CONSTITUTION METHOD FOR OPTICAL COMMUNICATION NETWORK, BANDPASS COUPLER AND OPTICAL COMMUNICATION NETWORK

摘要

PROBLEM TO BE SOLVED: To provide a constitution method wherein transmission devices composed of maximum 2m system whose wavelengths are permitted to be different are installed at low installation costs by using (m) pieces of optical fibers installed between buildings. SOLUTION: The (m) pieces of optical fibers are installed between the buildings, their wavelengths are separated, and the transmission devices which are composed of maximum 2m systems and whose wavelengths are permitted to be different are installed inside the buildings. The bandpass coupler which can be manufactured at low costs by combining two optical filters with a waveguide is used.