Optical receiving apparatus, optical transmitting apparatus, optical transmitting/receiving apparatus and optical transfer system

摘要

Disclosed is a wavelength multiplexing/demultiplexing optical transfer system which is prevented from becoming larger by an increase in the number of wavelength multiplexing/demultiplexing couplers which is increased as the number of wavelengths increases, thereby reducing the number of assembling steps to lead to cost reduction. As WDM (Wavelength Division Multiplexing) optical receiver modules each having a wavelength multiplexing/demultiplexing element and a light emitting element are connected sequentially, an input optical signal with four wavelengths is demultiplexed and each demultiplexed signal is converted to an electric signal to thereby ensure wavelength demultiplexing and data reproduction.