Optical communications – Transmitter – Having particular modulation
Reexamination Certificate
2006-08-08
2010-12-14
Vanderpuye, Kenneth N (Department: 2613)
Optical communications
Transmitter
Having particular modulation
C398S115000, C398S182000, C398S184000, C398S187000, C398S188000, C359S278000, C359S279000
Reexamination Certificate
active
07853153
ABSTRACT:
The present invention is to provide an optical modulating system for generating a signal of a frequency (f0+2fm) and a signal of a frequency (f0−2fm) and suppressing a signal of a frequency (f0) by a DSB-SC modulator.A fourth harmonic generating system for solving the above problem comprises a first DSB-SC modulator (2) a second DSB-SC modulator (3) and a signal control section (5) for controlling a modulating signal from a signal source (4) for generating modulating signals applied to the first and second DSB-SC modulators (2,3) so that a lower side-band signal (f0) generated by modulating the upper side-band signal of the DSB-SC modulator (2) by the DSB-SC modulator (3) and an upper side-band signal (f0) generated by modulating the lower side-band signal of the DSB-SC modulator (2) by the DSB-SC modulator (3) cancel each other.
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Izutsu Masayuki
Kawanishi Tetsuya
Sakamoto Takahide
Tsuchiya Masahiro
Dobson Daniel G
National Institute of Information and Communications Technology
Ostrager Chong & Flaherty & Broitman P.C.
Vanderpuye Kenneth N
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