Optical communications – Multiplex – Time division
Reexamination Certificate
2002-05-31
2009-08-11
Tran, Dzung D (Department: 2613)
Optical communications
Multiplex
Time division
C398S075000, C398S099000
Reexamination Certificate
active
07574139
ABSTRACT:
A method and an apparatus for implementing carrier suppressed data format on conventional OTDM modules is provided. Adaptive phase shifting of optical signals traversing one of the tributaries of an OTDM module is performed with feedback loop control. A tapped portion of the input carrier signal is phase modulated at a frequency fc, and is combined with a tapped portion of the output from the OTDM. A phase shifter controller fed with this combined signal photodetects and band-pass filters the signal around fcto extract the amplitude of the AC component of the envelope of the combined signal, which depends upon the phase difference between successive pulses of the OTDM output. This signal is used to control a phase shifter coupled along one of the tributaries of the OTDM to adjust the phase difference of the signals of the two tributaries so that carrier suppression results.
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Fu Xiaoli
Li Jinghui
Shi Feng
Wang Tongqing
Zhang Genzao
Fish & Richardson P.C.
Oplink Communications Inc.
Tran Dzung D
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