OPTICAL ADM

摘要

PROBLEM TO BE SOLVED: To provide an optical ADM capable of suppressing communication errors in other signal light in the case of changing the signal light to be demultiplexed or multiplexed.

SOLUTION: The optical ADM 100 is provided with an optical circulator 110, an optical circulator 120, an optical filter 131, and an optical filter 132. The optical circulator 110 outputs the light received by a port P11to a port P12, outputs the light received by the port P12to a port P13, and outputs the light received by the port P13to a port P14. The optical circulator 120 outputs the light received by a port P21to a port P22, outputs a light received by the port P22to a port P23, and outputs the light received by the port P23to a port P24. The optical filter 131 is located on a waveguide path between the ports P12and P23and the reflecting wavelength of the optical filter 131 is variable. The optical filter 132 is located on a waveguide path between the ports P13and P22and the reflecting wavelength of the optical filter 132 is variable.

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