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All-optical differentiator and high-speed pulse generation based on cross-polarization modulation in a semiconductor optical amplifier

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Abstract

We propose an all-optical intensity differentiation scheme based on cross-polarization modulation (XPolM) in a semiconductor optical amplifier (SOA) while demonstrating the absolute value of differential signal that can be obtained by the SOA-based XPolM of two parts with relative delay from the input signal and well extracted by the polarization filter. The differentiation errors and eye diagrams versus sampling time Δ are investigated for data rate at 12.5Gbitss, and the minimal error 0.06 is achieved at Δ=0. Owing to a much faster polarization response, our scheme bears great potential for all-optical signal processing over 100Gbitss. By application of the differentiator, we further obtain the 20GHz short pulse train with a pulse width of 10ps.

© 2009 Optical Society of America

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