Optical communications – Transmitter – Having particular modulation
Reexamination Certificate
2007-11-06
2007-11-06
Chan, Jason (Department: 2613)
Optical communications
Transmitter
Having particular modulation
C398S154000, C398S184000
Reexamination Certificate
active
10689484
ABSTRACT:
A method and apparatus is provided that yields improved performance of both single channel and WDM long-distance optical transmission systems by synchronously modulating of the transmitted signal's amplitude. An amplitude modulator receives an optical signal onto which data has been modulated at a predetermined frequency. The modulator re-modulates the amplitude of the optical signal in a continuous fashion with a waveform that is periodic, whose fundamental frequency is equal to the same predetermined frequency at which the data is modulated onto the optical signal. The resulting signal (which is neither a pure NRZ or RZ signal) is more tolerant to the distortions usually found in lightwave transmission systems, thus giving superior transmission performance.
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Chan Jason
Grossman Tucker Perreault & Pfleger PLLC
Tyco Telecommunications (US) Inc.
Wang Quan-Zhen
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