POLARIZATION-INSENSITIVE FREQUENCY-CONVERTER WITH THE CAPABILITY OF CHIRP REMOVAL

We report on a new type of polarization insensitive frequency conversi on technique using four-wave mixing (FWM) in a semiconductor optical a mplifier (SOA), In this technique the input signal is spectrally dupli cated by a Mach-Zehnder type phase modulator, Then, the resulting two waves generate the frequency converted output signal by FWM with use o f an additional pump wave, The converted output wavelength is independ ent of the wavelength of the input signal, In addition to the frequenc y conversion, the chirp of the input signal is removed by the FWM proc ess, bit-error-rate (BER)-measurements after transmission of the conve rted signal over standard communication fiber are reported.