Wavelength multiplexing module with polarization maintaining fibers as depolarizers

摘要

Disclosed is a wavelength multiplexing module which provides stable multiplexed output power. The wavelength multiplexing module comprises a plurality of pumping sources for outputting lights of different wavelengths, and a wavelength multiplexer for multiplexing the lights output from the pumping sources. The wavelength multiplexer is provided with optical input sections for respectively receiving the lights output from the pumping sources. Respectively provided between the optical input sections and the pumping sources are depolarizers each of which causes a degree of polarization of the light output from an associated one of the pumping sources to approach zero. Each depolarizer has two polarization-maintaining optical fibers connected in series on an optical path in such a way that primary optic axes of the polarization-maintaining optical fibers obliquely intersect each other.