Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2005-06-14
2005-06-14
Pascal, Leslie (Department: 2633)
Optical communications
Multiplex
Wavelength division or frequency division
C398S087000, C398S149000, C385S011000
Reexamination Certificate
active
06907199
ABSTRACT:
A method for compensating for polarization mode dispersion of an incoming optical communications signal including the step of orienting the state of polarization of the incoming optical communications signal with respect to the axes of a polarization splitter. The communications signal is split into a first and a second orthogonal states of polarization at a split point. The first of the polarization states is directed to a first birefringent optical waveguide having a first chirped grating having a first reference reflection point. The second of the polarization states is directed to a second birefringent optical waveguide having a second chirped grating having a chirp pattern substantially similar to that of the first chirped grating and having a second reference reflection point. The optical path length from the second reflection point to the split point is adjustably varied to compensate for polarization dispersion between the first and second states of polarization. The first and second polarization states are then recombined into an output signal.
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DeBaun Barbara A.
Koch Barry J.
Smith Terry L.
3M Innovative Properties Company
Pascal Leslie
Rosenblatt Gregg H.
Singh Dalzid
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