Optical communications – Multiplex – Optical switching
Reexamination Certificate
2005-09-01
2010-12-07
Liu, Li (Department: 2613)
Optical communications
Multiplex
Optical switching
C398S065000, C398S152000, C398S178000, C398S180000, C359S330000, C359S333000
Reexamination Certificate
active
07848647
ABSTRACT:
The polarization direction of an optical signal is changed by a polarization controller so as to be orthogonal to a main axis of a polarizer. A control pulse generator generates control pulses from control beam with a wavelength which is different from the wavelength of the optical signal. The optical signal and the control pulse are input to a nonlinear optical fiber. In the nonlinear optical fiber, the optical signal, during a time period in which the optical signal and the control pulse coincide, is amplified with optical parametric amplification around a polarization direction of the control pulse. The optical signal, during the time period in which the optical signal and the control pulse coincide, passes through the polarizer.
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Fujitsu Limited
Liu Li
Staas & Halsey , LLP
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