ANALYSIS OF LINEAR CROSSTALK IN PHOTONIC CROSSBAR SWITCHES BASED ON ON OFF GATES/

This paper presents expressions for the linear crosstalk and the resul ting error rate degradation in a photonic switch based on on/off gates , considering cyclostationary interference among digital signals. The periodically time-varying interference accounts for the dependencies o f error probability both on the spectrum of transmitted signals and on random bit-skews between channels. This paper quantitatively verifies the intuitions that bit-aligned channels increase the crosstalk power penalty, and that a sharp modulating pulse improves error probability , These dependencies on spectrum and bit-skews become noticeable at hi gh crosstalk levels caused by either a low contrast ratio or a large s witch size.