US 6,983,089 B2
Method of fabricating optical signal processor
Michiko Takushima, Yokohama (Japan); Tomomi Sano, Yokohama (Japan); Osamu Shimakawa, Yokohama (Japan); and Tatsuhiko Tanaka, Yokohama (Japan)
Assigned to Sumitomo Electric Industries, Ltd., Osaka (Japan)
Filed on Nov. 15, 2004, as Appl. No. 10/987,293.
Claims priority of provisional application 60/523662, filed on Nov. 21, 2003.
Claims priority of application No. P2003-390416 (JP), filed on Nov. 20, 2003.
Prior Publication US 2005/0141807 A1, Jun. 30, 2005
Int. Cl. G02B 6/28 (2006.01)
U.S. Cl. 385—24 12 Claims
OG exemplary drawing
 
1. A method of fabricating an optical signal processor, said optical signal processor including:
a spatial wavelength-dividing element, provided on an optical path reaching from an input optical waveguide to an output optical waveguide, for wavelength-dividing spatially a light beam into a plurality of beam components having wavelengths different from each other;
a spatial optical modulator for modulating spatially the beam components wavelength-divided by said spatial optical modulator;
a first lens system for introducing the light beam outputted from an end surface of said input waveguide to said spatial wavelength-dividing element as a collimated light; and
a second lens system introducing the beam components wavelength-divided by said spatial wavelength-dividing element to on said spatial optical modulator while condensing the beam components,
said method comprising the steps of:
selecting one or more optical waveguides each having a mode field diameter such that a desired band width of the transmission characteristics of said whole optical signal processor with respect to the light beam reaching from said input waveguide to said output waveguide can be obtained, and
fabricating said optical signal processor by applying said selected optical waveguide as a common optical waveguide corresponding to both of said input optical waveguide and said output optical waveguide, or by applying one of said selected optical waveguides to said input optical waveguide and applying another of said selected optical waveguides to said output optical waveguide.