Patent ID: 7356226
Filing Date: 2008-04-08
Classification: G02B

Abstract:
1. An optical waveguide coupler for optically coupling an optical waveguide and an optical component having mutually different spot sizes, comprising: a first spot size converting part, adapted to convert a spot size with higher 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 part adapted to convert a spot size with higher efficiency for the optical signal of the short wavelength band than for the optical signal of the long wavelength band, wherein the first spot size converting part and the second spot size converting part are coupled together, and a width of the first spot size converting part is narrowed in a direction toward the second spot size converting part side as the width of the first spot size converting part is substantially equal to a width of the second spot size converting part at a position of coupling.