Optical communications – Multiplex – Polarization
Reexamination Certificate
2008-10-31
2011-10-25
Liu, Li (Department: 2613)
Optical communications
Multiplex
Polarization
C398S029000, C398S081000, C398S147000, C398S152000, C398S158000, C398S159000, C398S208000
Reexamination Certificate
active
08045856
ABSTRACT:
The present disclosure provides polarization mode dispersion compensation (PMDC) and polarization de-multiplexing systems and methods for polarization multiplexed (PolMux) optical transmission systems. The PMDC detects an error signal before a polarization splitter in PolMux systems for controlling polarization controllers (PC) and/or DGDs in the PMDC for return-to-zero (RZ) differential m-phase shift keying (DmPSK) signals. For bit-aligned PolMux systems, the error signal could be the level of clock frequency at one, two, or more times of the baud rate at one polarization. For bit-interleaved PolMux systems, the error signal could be the level of clock frequency at two times of the baud rate at one polarization. The PMDC can operate in PolMux systems with any arbitrary time offset between the two polarizations. The polarization de-multiplexer utilizes error detection at both output arms of a polarization splitter to mitigate PDL impact on any PolMux type of signal.
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Sardesai Harshad
Shen Yunfeng
Zhong Shan
Baratta Jr. Lawrence A.
Bernard Christopher L.
Ciena Corporation
Clements Bernard PLLC
Liu Li
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