PUMP-INDUCED FREQUENCY-SHIFTING OF SWITCHED PULSES IN AN INTERFEROMETRIC ALL-OPTICAL SWITCH

The induced frequency chirping of switched pulses in an interferometri c all-optical switch that uses pump-induced nonlinear phase shifts is investigated. Using a nonlinear fiber Sagnac interferometer switch, it is shown that switched pulses suffer from frequency shift and broaden ing and can be compressed by using an anomalous group-velocity-dispers ion fiber. It is also demonstrated that picosecond probe pulses can be switched while retaining their temporal and spectral profiles if pump -probe walk-off is employed.