Patent ID: 6753996
Filing Date: 2004-06-22
Classification: G02F

Abstract:
A light-controlled light modulator for modulating, in response to light intensity of first input light with an arbitrary wavelength, second input light with a wavelength identical to or different from a wavelength of the first input light, said light-controlled light modulator comprising;a first optical combiner/splitter for combining the first input signal light and the second input light, and for distributing them to a plurality of ports; phase modulators, which are connected to the plurality of ports, including media that vary their refractive indices in response to the light intensity of the first input light; a second optical combiner for combining outputs from said phase modulators; and optical branching-delaying means for branching and delaying the second input light said optical branching-delaying means being connected to said second optical combiner and including a third optical combiner connected to a plurality of optical branching-delaying circuits which are different in length, wherein when the wavelength of the signal light equals the wavelength of the light to be converted, the wavelength conversion becomes possible without mixing noise into the wavelength-converted light output.