OPTICAL NODE, OPTICAL WAVELENGTH MULTIPLEXING AND DEMULTIPLEXING METHOD, AND OPTICAL TRANSMISSION SYSTEM

摘要

Wavelength multiplexed optical signals input at an input terminal 11 initially pass through an optical circulator. Then, a first optical signal having a specific wavelength is transmitted through an optical filter 17 and is output at an output terminal 12. The remaining first optical signals reflected by the optical filter 17 pass through optical circulators 15 and 16, and are then combined with an optical signal input at an input terminal 14 by an optical filter 18. Thereafter the resultant signals are output at an output terminal 13.