| 摘要 |
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), as a demultiplexed optical signal beam (38), 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°.
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