All-optical phase modulation using intersubband transition in quantum wells

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  • AKIMOTO Ryoichi
    National Institute of Advanced Industrial Science and Technology (AIST), Network Photonics Research Center
  • MOZUME Teruo
    National Institute of Advanced Industrial Science and Technology (AIST), Network Photonics Research Center
  • ISHIKAWA Hiroshi
    National Institute of Advanced Industrial Science and Technology (AIST), Network Photonics Research Center

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Other Title
  • サブバンド間遷移を用いた全光位相変調器
  • サブバンド カン センイ オ モチイタ ゼン ヒカリ イソウ ヘンチョウキ

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Abstract

<p>We report on the recent development of ultrafast all-optical gate switches using the intersubband transition (ISBT) in quantum wells (QWs). Recently, a new modulation mechanism in InGaAs/AlAs/AlAsSb QWs ISBT waveguides has been reported ; absorption-immune transverse electric (TE) light is phase-modulated by ISBT excitation. A Mach-Zehnder interferometric (MZI) ISBT gate switch based on this cross-phase modulation (XPM) has a much lower operation energy than switches based on absorption saturation. The functionality of all-optical signal processing required in high-speed transmission systems, such as the demultiplexing of 160 Gb/s signals and all-optical wavelength conversion has been demonstrated using MZI-ISBT gate switches. The mechanisms of XPM, the design of QWs for higher XPM efficiency, and the performance of MZI-ISBT gate switches are discussed.</p>

Journal

  • Oyo Buturi

    Oyo Buturi 79 (3), 225-229, 2010-03-10

    The Japan Society of Applied Physics

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