Optical waveguides – With optical coupler – Switch
Reexamination Certificate
2007-02-12
2009-11-17
Doan, Jennifer (Department: 2874)
Optical waveguides
With optical coupler
Switch
C385S015000, C385S024000, C398S001000, C398S002000, C398S003000
Reexamination Certificate
active
07620274
ABSTRACT:
An optical protection switch and a method for optical protection switching are provided. The optical protection switch includes a loop mirror-based optical switch with two circulators and a direction-dependent phase shifter in the loop mirror. The direction-dependent phase shifter introduces phase shifts in counter-propagating optical signals in the loop mirror such that either one of a first optical signal and a second optical signal are switched as an output optical signal. The direction-dependent phase shifter is controlled by a controller which initiates switching from the first optical signal to the second optical signal if a drop in power level is detected in the first optical signal and a corresponding drop in power level is not detected in the second optical signal and vice versa.
REFERENCES:
patent: 5134621 (1992-07-01), Marshall
patent: 5483340 (1996-01-01), Webb et al.
patent: 5533154 (1996-07-01), Smith
patent: 5673140 (1997-09-01), Fisher
patent: 5757529 (1998-05-01), Desurvire et al.
patent: 5828679 (1998-10-01), Fisher
patent: 5857040 (1999-01-01), Bigo et al.
patent: 6259552 (2001-07-01), Boffi et al.
patent: 6393167 (2002-05-01), Davis et al.
patent: 6577413 (2003-06-01), Saunders
patent: 6584241 (2003-06-01), Davis et al.
patent: 6624929 (2003-09-01), Kim et al.
patent: 6634813 (2003-10-01), Hall et al.
patent: 6819817 (2004-11-01), Kaneko et al.
patent: 6912338 (2005-06-01), Sotobayashi et al.
patent: 7123401 (2006-10-01), Shahar et al.
patent: 2002/0044727 (2002-04-01), Hung
patent: 2002/0057866 (2002-05-01), Hung
patent: 1150412 (2004-05-01), None
Lefevre, H.C., “Single-mode fibre fractional wave devices and polarisation controllers”,Electronics Letters, 16(20):778-780, Sep. 1980.
lbarra-Escamilla, B. et al., “Fiber optical loop mirror with a symmetrical coupler and a quarter-wave retarder plate in the loop”,Optics Communications, 242(1-3):191-197, Nov. 2004.
Culshaw, B., “The optical fibre Sagnac interferometer: an overview of its principles and applications”,Measurement Science and Technology, vol. 17, R1-R16, 2006.
Pottiez, O. et al., “Easily tunable nonlinear optical loop mirror based on polarization asymmetry”,Opt. Express, 12:3878-3887, 2004.
Atieh Ahmad
Mills John
BTI Systems Inc.
Doan Jennifer
LandOfFree
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