Patent ID: 6847475

Claim:
An optical signal processor comprising: a first input terminal for a pulse signal light with a signal wavelength; a second input terminal for a probe light with a wavelength different from the pulse signal wavelength; a first splitter to split the probe light into a first probe light portion and a second probe light portion; an XPM optical device, to which the first probe light portion from the first splitter and the pulse signal light enter, to modulate the first probe light portion from the first splitter according to amplitude variation of the pulse signal light and generate a phase-modulated output light; a second splitter to split the phase-modulated output light from the XPM optical device into a first phase-modulated portion and a second phase-modulated portion; a first combiner to combine the second probe light portion from the first splitter with the first phase-modulated portion from the second splitter in in-phase relation during a period corresponding to a non-pulse period of the pulse signal light; and a second combiner to combine the second phase-modulated portion from the second splitter with an output light from the first combiner in in-phase relation during a period corresponding to a pulse period of the pulse signal light.