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

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11 Author(s)
Dorren, H.J.S. ; COBRA Res. Inst., Eindhoven Univ. of Technol., Netherlands ; Xuelin Yang ; Mishra, A.K. ; Zhonggui Li
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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 /spl pi/ 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.

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Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:10 ,  Issue: 5 )