OPTICAL SIGNAL RELAYING AND AMPLIFYING APPARATUS AND OPTICAL LEVEL REGULATOR

摘要

PROBLEM TO BE SOLVED: To provide an optical relaying and amplifying apparatus and optical level regulator, which can remove noise by spontaneously emitted light beam and can regulate optical level which differs to a large extent for each wavelength. SOLUTION: A waveform-multiplexed input optical signal from an optical transmission path 101 is amplified by an optical amplifier 110, and this amplified output is then branched to individual wavelengths by an optical branching circuit 120. The branched four optical signals are transmitted to the optical transmission paths 131 to 134 and thereafter combined by an optical combining circuit 140 which are connected to the end terminal of the optical transmission paths 131 to 134, and this optical signal is then output to the optical transmission path 102 as the waveform multiplex signal. The optical branching circuit 120 functions as a filter to output only the branched wavelength and eliminate noise by the spontaneously emitted beam of the optical amplifier 110.