16 September 2005 Ultra-fast and ultra-small photonic crystal/quantum dot all-optical switch for future photonic networks
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We demonstrated a novel two-dimensional photonic crystal (PC) based Symmetric-Mach-Zehnder-type all-optical switch (PC-SMZ) with InAs quantum dots (QDs) acting as a nonlinear phase-shift source. The 600-μm-long PC-SMZ with integrated wavelength-selective PC-based directional couplers and other PC components exhibited a 15-ps-wide switching-window with a 2-ps rise/fall time at a wavelength of 1.3μm. Nonlinear optical phase shift in the 500-μm-long straight PC waveguide was also achieved at sufficiently low optical-energy (e.g., π phase shift at ~100-fJ control-pulse energy) due to the small saturation energy density of the QDs, which was enhanced in the PC waveguide, without having to use conventional measures such as SOAs with current-injected gain. These results pave the way to achieving novel PC- and QD-based photonic integrated circuits including multiple PC-SMZs and other novel functional devices.
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Hitoshi Nakamura, Hitoshi Nakamura, Yoshimasa Sugimoto, Yoshimasa Sugimoto, Kyozo Kanamoto, Kyozo Kanamoto, Naoki Ikeda, Naoki Ikeda, Yu Tanaka, Yu Tanaka, Yusui Nakamura, Yusui Nakamura, Shunsuke Ohkouchi, Shunsuke Ohkouchi, Kuon Inoue, Kuon Inoue, Hiroshi Ishikawa, Hiroshi Ishikawa, Kiyoshi Asakawa, Kiyoshi Asakawa, "Ultra-fast and ultra-small photonic crystal/quantum dot all-optical switch for future photonic networks", Proc. SPIE 5926, Tuning the Optical Response of Photonic Bandgap Structures II, 59260B (16 September 2005); doi: 10.1117/12.619928; https://doi.org/10.1117/12.619928

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