HOMODYNE CROSSTALK IN WDM RING AND BUS NETWORKS

We examine the combined effects of coherent and incoherent crosstalk i n wavelength-division multiplexed (WDM) ring and bus networks which us e add-drop multiplexers, It is widely understood that incoherent cross talk in these networks causes a fixed bit-error-rate (BER) floor at th e receiver, We show that coherent crosstalk causes a range of possible received powers. In combination with incoherent crosstalk, this leads to a range of possible BER floor positions. We use a Monte Carlo simu lation to show that when both coherent and incoherent crosstalk are co nsidered, BER Boors are likely to be higher than previously appreciate d, Satisfactory network performance can be ensured by careful network management, or by reducing component leakage.