Optical communications – Transmitter – Having particular modulation
Reexamination Certificate
2011-07-19
2011-07-19
Phan, Hanh (Department: 2613)
Optical communications
Transmitter
Having particular modulation
C398S184000, C398S188000, C398S152000, C398S065000, C385S011000, C356S073100
Reexamination Certificate
active
07983570
ABSTRACT:
Efficient apparatus, methods, systems and devices to generate, transmit and detect optical differential polarization-phase-shift keying signals are disclosed for high spectral efficiency optical communication systems. It includes an electrical encoder and an optical encoder for generation of differentially encoded polarization-phase modulated optical signals and optical demodulators and balanced detectors for detection of the optical signals. The optical signals are transmitted through optical fiber links or free space. The electrical encoder maps independent data channels into differentially-encoded data sequences. In the optical encoder, the encoded data sequences from the electrical encoder drive optical modulators to generate differentially-encoded polarization-phase modulated optical signals at a symbol rate equal to the bit rate of each input data channel. After transmission through a transmission medium, the optical signals are demodulated optically and the original data are recovered by multilevel detection, without recovering the polarization state of received signals.
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Han Yan
Li Guifang
Law Offices of Brian S. Steinberger , P.A.
Phan Hanh
Steinberger Brian S.
University of Central Florida Research Foundation Inc.
Wood Phyllis K.
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