Yaser Khorrami - Tarbiat Modares University
Vahid Ahmadi
Mohammad Razaghi - University of Kurdistan

A new method for increasing speed of all-optical Mach-Zehnder Interferometric (MZI) switching with bulk semiconductor optical amplifier (SOA), by use of chirped controlsignals, is suggested and theoretically analyzed. For 125 fs input and chirped control pulses, we show acceleration of gain recoveryprocess using cross phase modulation (XPM) effect. Our method depicts that Tb/s switching speeds using bulk SOA-MZI with proper Q-factor is feasible. For the first time we reach operationcapability at 2Tb/s with a Q-factor more than 10. The new scheme also improves the extinction and amplitude ratio of theoutput power as well as increases the contrast ratio of the switched signal. We use finite difference beam propagationmethod for MZI analysis, taking into account all nonlinear effects of SOA such as group velocity dispersion (GVD), Kerr effect, two photon absorption (TPA), carrier heating (CH) and spectral holeburning (SHB).

Ultrafast nonlinear optics; All-optical devices; Switching; Chirping; Mach-Zehnder interferometer;Semiconductor optical amplifiers