Optical communications – Multiplex – Optical switching
Reexamination Certificate
2002-11-06
2008-03-25
Vanderpuye, Kenneth (Department: 2613)
Optical communications
Multiplex
Optical switching
C398S048000, C398S082000, C398S083000, C385S017000, C385S016000, C385S024000, C385S037000, C385S043000
Reexamination Certificate
active
07349628
ABSTRACT:
A device and method for multiplexing or demultiplexing M optical signals, each having a different wavelength λm. An MMI waveguide has a length such that each optical signal that propagates into the MMI waveguide at an i:th access waveguide, where i≦N, and N is greater than or equal to 2, produces N self-images inside the MMI waveguide at a respective distance Imfrom the access waveguides. Each of M wavelength selective reflectors is arranged near a respective distance Im, wherein the m:th reflector reflects the optical signal carried by the m:th wavelength, where 2≦m≦M, while being substantially transparent to all other wavelengths. Each of M phase adjustors is arranged relative to a corresponding reflector, wherein the m:th phase adjustor adjusts the phase of the self-images of the optical signal carried by the m:th wavelength to create a single self-image at a selected output access waveguide when reflected by the m:th reflector.
REFERENCES:
patent: 5889906 (1999-03-01), Chen
patent: 5953467 (1999-09-01), Madsen
patent: 6005992 (1999-12-01), Augustsson et al.
patent: 6108478 (2000-08-01), Harpin et al.
patent: 6188818 (2001-02-01), Han et al.
patent: 6345136 (2002-02-01), Augustsson
patent: 6603893 (2003-08-01), Liu et al.
patent: 6892021 (2005-05-01), Doerr
patent: 2002/0181832 (2002-12-01), Feng et al.
patent: WO 00/18042 (2000-03-01), None
patent: WO 01/33758 (2001-05-01), None
patent: WO 01/73994 (2001-10-01), None
Leuthold et al: “Multimode Interference Coupler with Tunable Power Splitting Ratios”, Journal of Lightwave Technology, vol. 19, No. 5, May 2001, p. 700-70.
Augustsson: “Bragg grating assisted MMIMI coupler for wavelength selective switching”, Electronics Letters, vol. 34, No. 25, Dec. 1998, p. 2416-2418.
Liu Li
Telefonaktiebolaget LM Ericsson (publ)
Vanderpuye Kenneth
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