All-optical logic based on ultrafast gain and index dynamics in a semiconductor optical amplifier

H.J.S. Dorren, X. Yang, A.K. Mishra, Z. Li, H. Ju, H. Waardt, de, G.D. Khoe, T. Simoyama, H. Ishikawa, H. Kawashima, T. Hasama

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Abstract

We investigate nonlinear carrier dynamics in a multiquantum-well semiconductor optical amplifier (SOA) in the context of ultrafast all-optical logic. A rate-equation model is presented that accounts for two-photon absorption, free-carrier absorption, self- and cross phase modulation, carrier heating, spectral, spatial hole burning, and self- and cross polarization modulation. The nonlinear refractive index dynamics is investigated theoretically and experimentally. We find nonlinear phase changes larger than p radians, which recovers on a timescale in the order of 1 ps. We also investigate a nonlinear AND gate that consists of an SOA that is placed in an asymmetric Mach-Zehnder interferometer. We show that the gate can be operated using 800-fJ optical pulses with duration of 200 fs while having a contrast ratio larger than 11 dB.
Original languageEnglish
Pages (from-to)1079-1092
Number of pages14
JournalIEEE Journal of Selected Topics in Quantum Electronics
Volume10
Issue number5
DOIs
Publication statusPublished - 2004

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