Optical communications – Optical repeater system – Specific optical waveguide
Reexamination Certificate
2006-03-07
2006-03-07
Sedighian, M. R. (Department: 2633)
Optical communications
Optical repeater system
Specific optical waveguide
C398S173000, C398S175000, C398S149000, C398S102000, C398S161000, C385S015000
Reexamination Certificate
active
07010235
ABSTRACT:
A system for all-optical signal regeneration is provided, which makes it possible to exhibit desired intensity noise suppressing function with respect to pulsed input signal light without increasing the injection current of semiconductor optical amplifiers even if the magnitude of nonlinear phase shift of the input signal light is less than π. The output light of the first delay interference unit is subjected to phase shift in the first nonlinear semiconductor waveguide and then, applied to the second delay interference unit along with the clock light. In the second delay interference unit, the first interfered light is generated from the output light while the second interfered light is generated from the clock light having an opposite logic to the input light. The second interfered light is subjected to phase shift by the first interfered light in the second nonlinear semiconductor waveguide and then, applied to the third delay interference unit. The third interfered light having an opposite logic to the input light is generated from the second interfered light in the third delay interference unit. The third interfered light is the output light of the system.
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Dickstein Shapiro Morin & Oshinsky LLP.
Lee David
NEC Corporation
Sedighian M. R.
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