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FDTD simulation of wavelength conversion of ultrashort pulses utilizing intersubband absorption in AlGaN/GaN quantum wells

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Abstract

The four-wave mixing (FWM) characteristics of 500-fs pulses in nonlinear optical waveguides utilizing the saturation of the intersubband absorption at 1.55 μm in nitride multiple quantum wells are calculated by a one-dimensional finite-difference time-domain (FDTD) method combined with three-level rate equations describing the intersubband carrier dynamics. Efficiency for a 100-nm wavelength conversion in a 160-μm waveguide is predicted to be higher than 3% both for up- and down-conversions. The extinction ratio is higher than 20 dB. As for the short-pulse application, however, the conversion efficiency is strongly dependent on the phase difference between the pump and signal pulses, especially when the efficiency is high. This causes ambiguity in the output power. Therefore, the cross-loss-modulation (XLM) converter is preferable to the FWM converter for OTDM application. The FWM converters are considered to be applicable to simultaneous conversion of WDM signals.

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Authors and Affiliations

  1. Corporate R&D Center, Toshiba Corporation, 1, Komukai Toshiba-cho, Saiwai-ku, Kawasaki, 212-8582, Japan

    Nobuo Suzuki

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  1. Nobuo Suzuki
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Suzuki, N. FDTD simulation of wavelength conversion of ultrashort pulses utilizing intersubband absorption in AlGaN/GaN quantum wells. Optical and Quantum Electronics 33, 985–997 (2001). https://doi.org/10.1023/A:1017599128166

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  • DOI: https://doi.org/10.1023/A:1017599128166

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