Optical communications – Transmitter – Having particular modulation
Reexamination Certificate
2005-06-28
2008-10-07
Chan, Jason (Department: 2613)
Optical communications
Transmitter
Having particular modulation
C398S183000
Reexamination Certificate
active
07433604
ABSTRACT:
Efficient systems, devices, apparatus and methods to generate, transmit and detect differentially encoded 8-level phase-modulated optical signals for spectrally efficient optical communication systems is invented. It includes an electrical encoder and an optical encoder for generation of differentially encoded 8-level 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 air. The electrical encoder maps three independent data channels into three differentially-encoded data sequences. In the optical encoder, the encoded data sequences from the electrical encoder drive optical modulators to generate differentially-encoded 8-level phase modulated optical signals at a symbol rate equal to the bit rate of each input data channel. After transmission through optical fiber, the optical signals are demodulated optically and the original data are recovered by the balanced detectors with direct detection.
REFERENCES:
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Ohm et al.; Dispersion Compensation and Dispersion Tolerance of Optical 40 Gbit/s DBPSK, DQPSK and 8-DPSK Transmission Systems with RZ and NRZ Impulse Shaping, ITG-Fachtagung, Leipzig, Germany, May 2004.
Han, Y. et al., “Simplified Receiver Implementation for Optical Differential 8-level Phase-Shift Keying”, Electronics Letters, vol. 40, No. 21, Oct. 14, 2004.
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Han Yan
Kim Cheol-hwan
Li Guifang
Chan Jason
Curs Nathan M
Law Offices of Brian S. Steinberger , P.A.
Steinberger Brian S.
University of Central Florida Research Foundation Inc.
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