All-optical wavelength conversion is demonstrated by using a spectrum-sliced amplified spontaneous emission
(ASE) in the semiconductor optical amplifier (SOA) as the probe light and a delay interference configuration.
Characteristics of the ASE output in terms of its spectral dependences under the co-propagating injection by a
signal light are analyzed theoretically. Analytical expressions for the ASE output in terms of power and phase
changes in the wavelength conversion are deduced. An experimental system based on this scheme is built and
its operation principles are introduced. System's performances are investigated and several experimental results
on measurements of bit error ratios, extinction ratios under different wavelengths and time waveforms as well as
eye diagrams are presented.
The theory and experimental system of an all-optical wavelength conversion in a SOA-Sagnac interferometer are put forward. The wavelength conversion with RZ light pulse at 622 Mbit/s was obtained, and the wavelength conversion range of about 43nm with the extinction ratio of larger than 10 dB was achieved.