| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical waveguide coupler for efficiently optically coupling an optical waveguide and an optical component having mutually different spot sizes, for optical signals in a plurality of wavelength bands, and to provide a sub-assembled optical unit, an optical module and an optically coupling method. SOLUTION: The optical waveguide coupler, the sub-assembled optical unit, the optical module, and the optically coupling method, are characterized in having: a first spot size converting means, placed on the optical waveguide side that has a higher spot size conversion efficiency for an optical signal of a long wavelength band than for an optical signal of a short wavelength band; and a second spot size converting means, placed on the optical component side, that has a higher spot size conversion efficiency for an optical signal of a short wavelength band than for an optical signal of a long wavelength band, for the purpose of optically coupling the optical waveguide and the optical component having mutually different spot sizes. COPYRIGHT: (C)2007,JPO&INPIT |
