Abstract
An analytical approach is presented to evaluate the bit error rate (BER) performance results of an optical IM-DD system with wavelength conversion based on cross-phase modulation in two semiconductor optical amplifiers (SOAs) arranged in the two arms of a Mach-Zehnder interferometer (MZI) followed by a Fabry-Perot filter. It is found that the signal-to-noise ratio (SNR) at the output of the converter critically depends on the differential phase of the converter signal between the two arms of the MZI and attains a maximum value corresponding to an optimum value of the differential phase. There is an optimum value of BER corresponding to the maximum SNR. At values of SNR other than maximum, the system suffers a penalty in signal power at a given HER and is found to increase with increase in the phase error and significantly high in the presence of phase noise due to the transmitting and converter wave laser sources. It is noticed that the penalty is 1.4 dB for normalized laser linewidth ΔνTh = 0.0 and becomes almost 8 dB for AvT =.005 and is exceedingly high at increased value of ΔνT when the differential phase error at the output of the MZI is 0.75 π.
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