Optical communications – Transmitter – Having particular modulation
Reexamination Certificate
2011-03-22
2011-03-22
Vanderpuye, Ken N (Department: 2613)
Optical communications
Transmitter
Having particular modulation
C398S186000, C398S187000, C398S188000
Reexamination Certificate
active
07912378
ABSTRACT:
A system operable to modulate a signal according to phase-shift keying (PSK) modulation includes one or more phase modulators that comprise one or more fractional phase modulators. A fractional phase modulator includes a splitter that splits a communication signal to yield a first communication signal with first amplitude and a second communication signal with second amplitude, where the ratio of the first and second amplitudes correspond to a phase shift. A phase shifter phase shifts the first or second communication signal. A first modulator modulates the first communication signal at a constant phase. A second modulator modulates the second communication signal at phases corresponding to the phase shift to encode data. A coupler couples the first communication signal and the second communication signal.
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Naito Takao
Tian Cechan
Baker & Botts L.L.P.
Fujitsu Limited
Ngo Tanya
Vanderpuye Ken N
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