Optical waveguides – With optical coupler – Switch
Reexamination Certificate
2006-04-25
2006-04-25
Font, Frank G. (Department: 2883)
Optical waveguides
With optical coupler
Switch
C385S016000, C385S020000, C385S021000, C385S024000, C385S047000
Reexamination Certificate
active
07035500
ABSTRACT:
The present invention relates to device for space selective switching of an optical signal from an input access waveguide to a first selected output access waveguide. Said device comprising a multi-mode interference (MMI) waveguide having at a first side a number, N, of accesses for connection of access waveguides. Said MMI waveguide having a length, in light propagating direction, so that an image at the i:th, i≦N access waveguide propagating into said MMI waveguide will produce N self-images at a second side opposite to said first side, where N is an integer than 1. Said device further comprises reflective means located in said MMI waveguide close to said second side, arranged to reflect said N self-images towards said first side of said MMI waveguide, and means, arranged at said second side, for adjusting the phase of each of said self-images to create a single self-image at said selected output access waveguide.
REFERENCES:
patent: 5933554 (1999-08-01), Leuthold et al.
patent: 5953467 (1999-09-01), Madsen
patent: 6055992 (2000-05-01), Skarne
patent: 6222958 (2001-04-01), Paiam
patent: 6571031 (2003-05-01), Augustsson
patent: 0933963 (1999-08-01), None
patent: WO 9325923 (1993-12-01), None
Font Frank G.
Peng Charlie
Telefonaktiebolaget LM Ericsson (publ)
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