Optical waveguides – Integrated optical circuit
Reexamination Certificate
2006-02-07
2006-02-07
Healy, Brian M. (Department: 2883)
Optical waveguides
Integrated optical circuit
C385S027000, C385S031000, C385S129000, C385S130000, C398S079000, C398S081000
Reexamination Certificate
active
06996302
ABSTRACT:
The present invention provides an optical demultiplexer and an optical multi-/demultiplexer at low cost without reducing performance capabilities. The optical demultiplexer includes a multi-mode waveguide having such an optical path length as to cause a difference between first and second wavelengths with respect to a phase difference between zero- and first-order modes to become an integral multiple of π, an input waveguide optically connected to the input side of the multi-mode waveguide such that the optical axis thereof is offset from the center line of the multi-mode waveguide, and two output waveguides optically coupled to the multi-mode waveguide at different positions of the output side of the multi-mode waveguide. The two output waveguides are located in such a manner as to maximize the extinction ratio.
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Healy Brian M.
Matsushita Electric Industrial Co. LTD
Wenderoth , Lind & Ponack, L.L.P.
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