OPTICAL TRANSMISSION APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide an optical transmission apparatus capable of reducing the initial introduction cost, flexibly extending its function in response to the tendency of high power and a long distance and realizing OSNR improvement at a low cost at extending the function.

SOLUTION: The optical transmission apparatus includes an OADM 102 located on an optical transmission line 101 and adding and dropping an optical signal; a Preamplifier section 103 located at a pre-stage of the OADM 102; and a post amplifier section 104 located at a post-stage of the OADM 102. The Post amplifier section 104 includes: a dispersion compensation fiber 111 and an excitation light multiplexer 124a located at the post stage of the OADM 102; and an excitation light source 125a connected to the excitation light multiplexer 124a at the extension of the function of the optical transmission apparatus and for applying Raman amplification to the dispersion compensation fiber 111. The Preamplifier section 103 includes a excitation light multiplexer 114a and an excitation light source 115a connected at the extension of the function of the optical transmission apparatus and for applying Raman amplification to the signal on the transmission line 101.

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