Optical: systems and elements – Optical modulator – Light wave temporal modulation
Reexamination Certificate
2005-04-12
2005-04-12
Sugarman, Scott J. (Department: 2873)
Optical: systems and elements
Optical modulator
Light wave temporal modulation
C398S081000
Reexamination Certificate
active
06879426
ABSTRACT:
A system and method for programmable phase compensation of optical signals is disclosed. The systems and methods include the use of a polarization-independent spatial light modulator (PI-SLM), so that the state of polarization (SOP) of the incoming optical signal need not be known. The system includes a first dispersive module that spatially separates the optical signal into its frequency components. The frequency components are spread over the active area of the PI-SLM. The active area of the PI-SLM includes an array of independently programmable addressable regions capable of altering the phase of the light incident thereon. An exemplary application of the invention is chromatic dispersion compensation. By knowing the amount of chromatic dispersion in the optical signal, or alternatively, by knowing the amount of chromatic dispersion to be introduced into the optical signal downstream, the appropriate phase adjustments can be made to each frequency component of the signal. The phase-adjusted frequency components are then recombined via a second dispersive module to form a compensated optical signal.
REFERENCES:
patent: 6275623 (2001-08-01), Brophy et al.
patent: 6327068 (2001-12-01), Silberberg et al.
Hanig Richard
Purdue Research Foundation
Schwegman Lundberg Woessner & Kluth P.A.
Sugarman Scott J.
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