Patent ID: 7010235

Claim:
A method for all-optical signal regeneration, comprising: (a) inputting pulsed input signal light with a first wavelength into first nonlinear semiconductor waveguide means to cause nonlinear change of refractive index therein; (b) generating first pulsed clock light and second pulsed clock light by extracting optical clock from the input signal light; the first clock light having a second wavelength different from the first wavelength; the second clock light having the first wavelength; (c) dividing the first optical clock into a first component and a second component and generating a first delay time between the first component and the second component, thereby generating first pulsed output light including the first component and the second component; the first output light having the second wavelength; (d) applying the first output light to the first nonlinear semiconductor waveguide means to cause nonlinear phase shift in the first output light using the nonlinear change of refractive index caused by the input signal light; (e) applying the first output light having the nonlinear phase shift caused by the first nonlinear semiconductor waveguide means and the second clock light to first delayed-interference means, thereby generating second pulsed output light from the first output light and third pulsed output light from the second clock light; the second output light having the second wavelength and an opposite logic to the input signal light; the third output light having the first wavelength; (f) applying the second output light to second nonlinear semiconductor waveguide means to cause nonlinear change of refractive index therein; (g) applying the third output light into the second nonlinear semiconductor waveguide means to cause nonlinear phase shift in the third output light using the nonlinear change of refractive index of the second nonlinear semiconductor waveguide means caused by the second output light; (h) applying the third output light having the nonlinear phase shift caused to the second delayed-interference means, thereby generating fourth pulsed output light; the fourth output light having the first wavelength and a same logic as the input signal light; and (i) generating pulsed light for regeneration using the fourth output light.