| 摘要 |
PROBLEM TO BE SOLVED: To effectively attenuate reflected light from a band pass filter and to improve characteristics of the whole system using an optical device adaptable to V-ONU. SOLUTION: An optical device 10A has an optical fiber 26, an optical demultiplexer 14 having an optical demultiplexing member 36 for demultiplexing a portion of an optical signal beam 34 transmitted through the optical fiber 26, and guiding the demultiplexed optical signal beam 38 out of the optical fiber 26, an optical path changer 40 for changing an optical path of the demultiplexed optical signal beam 38 guided out of the optical fiber 26, a waveguide 16 serving as at least a medium from which the demultiplexed optical signal beam 38 is emitted to the optical path changer 40, and a filter 18 disposed on a surface of the waveguide 16. An angle of incidence of the demultiplexed optical signal beam 38 on the filter 18 is equal to or greater than 0.5°. COPYRIGHT: (C)2007,JPO&INPIT
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