Optical communications – Transmitter – Having particular modulation
Reexamination Certificate
2011-08-02
2011-08-02
Curs, Nathan M (Department: 2613)
Optical communications
Transmitter
Having particular modulation
C398S187000, C398S188000, C398S193000
Reexamination Certificate
active
07991297
ABSTRACT:
A method for generating D-N-PSK optical signals is disclosed wherein a laser is modulated to generate optical signal pairs including phase modulated and fixed phase portions, the phase modulated portions having a frequency encoding one or more data symbols and the fixed phase portion having a carrier frequency and a phase corresponding to the immediately preceding phase modulated portion. The output of the laser is passed through an optical spectrum reshaper having a transmission function chosen to attenuate a plurality of the phase modulated portions relative to the fixed phase portions. The phase modulated portions may have N frequency levels located on either side of the carrier frequency. One of the N frequency levels may be equal to the carrier frequency.
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Mahgerefteh Daniel
Matsui Yasuhiro
Singer Andrew C
Tayebati Parviz
Zheng Xueyan
Curs Nathan M
Finisar Corporation
Maschoff Gilmore & Israelsen
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