| 摘要 |
<P>PROBLEM TO BE SOLVED: To attain a stable receiver sensitivity by suppressing level fluctuation of a demultiplexed light beam even in the occurrence of change in the refractive index of component members and change in temperature. <P>SOLUTION: A first optical device 10A has an optical fiber mount 12 with an optical fiber 26 disposed thereon, and an optical demultiplexer 14 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. The optical fiber 26 has a first tapered surface 70 for emitting the demultiplexed optical signal beam 38 therethrough. The first tapered surface 70 is inclined at an angle θ1 of at least 1° to an optical axis of the optical fiber 26. The distance h between the optical axis of the optical fiber 26 and the first tapered surface 70 is progressively greater along the direction in which the optical signal beam 34 travels through the optical fiber 26. <P>COPYRIGHT: (C)2007,JPO&INPIT |
