The effect of signal repetition rate, injected current and switching window on cross-phase modulation in SOA-NOLM

The cross phase modulation (XPM) has an important impact on today´s high speed dense wavelength division multiplexing optical fiber communication systems. In order to obtain high conversion speed and strong non-linearity, semiconductor optical amplifier nonlinear optical loop mirror (SOA-NOLM) is operated with large bias current and high optical powers. In this paper, an investigation of XPM on the SOA-NOLM with reference to variable SOA´s currents, speed and switching window is presented. Furthermore, signal induced phase shift dependence on bias current of the SOA and optimized loop parameters are also included.