Performance limitations due to crosstalk in a WDM system using optical cross-connect based on tunable fiber Bragg gratings and optical circulators

Performance analysis is carried out to evaluate the impact of crosstalk on an optical signal passing through an FBG-OC (fiber Bragg grating-optical circulator) based optical cross connect in WDM network in terms of bit-error-rate (BER) performance. Results show that the system suffers a power penalty (at BER = 10^-9) of 7.25 dB if the value of fiber Bragg grating crosstalk factor (X_FG) is increased from -80 dB to -50 dB for a fixed value of optical circulator crosstalk factor (X_OC) and a power penalty (at BER = 10^-9) of 2.5 dB when the value of X_OC is increased from -30 dB to -15 dB for a fixed value of X_FG.