Optical communications – Multiplex – Polarization
Reexamination Certificate
2008-05-06
2011-10-25
Singh, Dalzid (Department: 2613)
Optical communications
Multiplex
Polarization
C398S152000, C398S158000, C398S184000
Reexamination Certificate
active
08045855
ABSTRACT:
The present invention provides systems and methods for the mitigation of PMD impairments in fiber optic links. The present invention utilizes synchronous polarization modulation and digital control of polarization modulation, instead of independent polarization modulators and analog control used in the current state of art. Also, the present invention utilizes a feedback loop to avoid identified bad polarization states instead of a random open loop operation. Further, the present invention includes a mechanism to continually update polarization states based on pre-corrected FEC error analysis from data receivers. Additionally, the present invention includes a mechanism for collecting and correlating error feedback signals from multiple geographically-diverse network nodes. Advantageously, the present invention provides a cost-effective and efficient way to implement mitigation of PMD impairments, while using only a small fraction of the FEC error correction capability.
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patent: 2004/0202396 (2004-10-01), Chung et al.
patent: 2006/0153575 (2006-07-01), Bulow
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Baratta Jr. Lawrence A.
Bernard Christopher L.
Ciena Corporation
Clements Bernard PLLC
Singh Dalzid
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