The Experts below are selected from a list of 50901 Experts worldwide ranked by ideXlab platform

S. Nakamura - One of the best experts on this subject based on the ideXlab platform.

  • Demultiplexing of 168-Gb/s data pulses with a hybrid-integrated symmetric Mach-Zehnder all-Optical Switch
    IEEE Photonics Technology Letters, 2000
    Co-Authors: S. Nakamura, T. Shimoda, H. Hatakeyama, J. Sasaki, T. Sugimoto, Y Ueno, T Kato, K Tajima, M Itoh, T. Tamanuki
    Abstract:

    We have developed a hybrid-integrated symmetric Mach-Zehnder all-Optical Switch and evaluated the demultiplexing of 168-Gb/s data pulses at a repetition rate of 10 GHz with this Switch. A compact, stable device was realized by assembling semiconductor Optical amplifiers as nonlinear waveguides on a planar lightwave circuit in a self-aligned manner. A 6.0-ps Switching window needed for 168-Gb/s demultiplexing was provided by the push-pull operation of the symmetric Mach-Zehnder all-Optical Switch. Demultiplexed signal light showed a high extinction ratio of better than 18 dB. Error-free demultiplexing with a bit error rate of 10/sup -11/ was achieved.

  • ultrafast polarization discriminating mach zehnder all Optical Switch
    Applied Physics Letters, 1995
    Co-Authors: Kazuhito Tajima, S. Nakamura, Y Sugimoto
    Abstract:

    We propose a polarization‐discriminating Mach‐Zehnder (PDMZ) all‐Optical Switch. The Switching speed of this PDMZ all‐Optical Switch is not limited by the slow relaxation time of highly efficient incoherent nonlinearities. We demonstrate a squarelike modulation characteristic, which is necessary in most Switching applications, at a Switching speed (on‐off time) of 40 ps. We also demonstrate ultrafast Switching at a detector limited speed of ∼8 ps.

  • experimental investigation on high speed Switching characteristics of a novel symmetric mach zehnder all Optical Switch
    Applied Physics Letters, 1994
    Co-Authors: S. Nakamura, Kazuhito Tajima, Y Sugimoto
    Abstract:

    We report the experimental results of a novel symmetric Mach–Zehnder (SMZ) all‐Optical Switch. Although the Switching is based on the band‐filling effect in the semiconductor waveguide, the Switching speed is not restricted by the slow relaxation time. We obtain fully Switched, nearly square modulation, which is characteristic of the SMZ all‐Optical Switch. We also achieve high‐speed Switching; the full width at half‐maximum of the obtained wave form is 8 ps, which is only limited by the time resolution of the detection system.

Daryl M. Beggs - One of the best experts on this subject based on the ideXlab platform.

  • Ultrashort photonic crystal Optical Switch actuated by a microheater
    IEEE Photonics Technology Letters, 2009
    Co-Authors: Daryl M. Beggs, Lee Cairns, T P White, Liam O'faolain, Thomas F. Krauss
    Abstract:

    We demonstrate a silicon photonic crystal (PhC) Optical Switch with a 20-mus response time controlled by a thermo-optic microheater. The Switch consists of a dispersion engineered PhC directional coupler that is only 4.9 mum long. Optical and electrical isolation is provided by backfilling the holes and embedding the PhC in a silica cladding to produce a vertically symmetric structure that is more robust than a membrane geometry. No increase in Optical loss is observed due to the silica cladding, despite operating above the lightline; the insertion loss for airbridge and silica embedded structures are comparable at 1-2 dB.

  • ultracompact and low power Optical Switch based on silicon photonic crystals
    Optics Letters, 2008
    Co-Authors: Daryl M. Beggs, Thomas P White, Liam Ofaolain, T F Krauss
    Abstract:

    Switching light is one of the most fundamental functions of an Optical circuit. As such, Optical Switches are a major research topic in photonics, and many types of Switches have been realized. Most Optical Switches operate by imposing a phase shift between two sections of the device to direct light from one port to another, or to Switch it on and off, the major constraint being that typical refractive index changes are very small. Conventional solutions address this issue by making long devices, thus increasing the footprint, or by using resonant enhancement, thus reducing the bandwidth. We present a slow-light-enhanced Optical Switch that is 36 times shorter than a conventional device for the same refractive index change and has a Switching length of 5.2

Y Sugimoto - One of the best experts on this subject based on the ideXlab platform.

  • ultrafast polarization discriminating mach zehnder all Optical Switch
    Applied Physics Letters, 1995
    Co-Authors: Kazuhito Tajima, S. Nakamura, Y Sugimoto
    Abstract:

    We propose a polarization‐discriminating Mach‐Zehnder (PDMZ) all‐Optical Switch. The Switching speed of this PDMZ all‐Optical Switch is not limited by the slow relaxation time of highly efficient incoherent nonlinearities. We demonstrate a squarelike modulation characteristic, which is necessary in most Switching applications, at a Switching speed (on‐off time) of 40 ps. We also demonstrate ultrafast Switching at a detector limited speed of ∼8 ps.

  • experimental investigation on high speed Switching characteristics of a novel symmetric mach zehnder all Optical Switch
    Applied Physics Letters, 1994
    Co-Authors: S. Nakamura, Kazuhito Tajima, Y Sugimoto
    Abstract:

    We report the experimental results of a novel symmetric Mach–Zehnder (SMZ) all‐Optical Switch. Although the Switching is based on the band‐filling effect in the semiconductor waveguide, the Switching speed is not restricted by the slow relaxation time. We obtain fully Switched, nearly square modulation, which is characteristic of the SMZ all‐Optical Switch. We also achieve high‐speed Switching; the full width at half‐maximum of the obtained wave form is 8 ps, which is only limited by the time resolution of the detection system.

Thomas F. Krauss - One of the best experts on this subject based on the ideXlab platform.

  • Ultrashort photonic crystal Optical Switch actuated by a microheater
    IEEE Photonics Technology Letters, 2009
    Co-Authors: Daryl M. Beggs, Lee Cairns, T P White, Liam O'faolain, Thomas F. Krauss
    Abstract:

    We demonstrate a silicon photonic crystal (PhC) Optical Switch with a 20-mus response time controlled by a thermo-optic microheater. The Switch consists of a dispersion engineered PhC directional coupler that is only 4.9 mum long. Optical and electrical isolation is provided by backfilling the holes and embedding the PhC in a silica cladding to produce a vertically symmetric structure that is more robust than a membrane geometry. No increase in Optical loss is observed due to the silica cladding, despite operating above the lightline; the insertion loss for airbridge and silica embedded structures are comparable at 1-2 dB.

Kazuhito Tajima - One of the best experts on this subject based on the ideXlab platform.

  • ultrafast polarization discriminating mach zehnder all Optical Switch
    Applied Physics Letters, 1995
    Co-Authors: Kazuhito Tajima, S. Nakamura, Y Sugimoto
    Abstract:

    We propose a polarization‐discriminating Mach‐Zehnder (PDMZ) all‐Optical Switch. The Switching speed of this PDMZ all‐Optical Switch is not limited by the slow relaxation time of highly efficient incoherent nonlinearities. We demonstrate a squarelike modulation characteristic, which is necessary in most Switching applications, at a Switching speed (on‐off time) of 40 ps. We also demonstrate ultrafast Switching at a detector limited speed of ∼8 ps.

  • experimental investigation on high speed Switching characteristics of a novel symmetric mach zehnder all Optical Switch
    Applied Physics Letters, 1994
    Co-Authors: S. Nakamura, Kazuhito Tajima, Y Sugimoto
    Abstract:

    We report the experimental results of a novel symmetric Mach–Zehnder (SMZ) all‐Optical Switch. Although the Switching is based on the band‐filling effect in the semiconductor waveguide, the Switching speed is not restricted by the slow relaxation time. We obtain fully Switched, nearly square modulation, which is characteristic of the SMZ all‐Optical Switch. We also achieve high‐speed Switching; the full width at half‐maximum of the obtained wave form is 8 ps, which is only limited by the time resolution of the detection system.

  • all Optical Switch with Switch off time unrestricted by carrier lifetime
    Japanese Journal of Applied Physics, 1993
    Co-Authors: Kazuhito Tajima
    Abstract:

    We propose a symmetric Mach-Zehnder-type all-Optical Switch which is based on the nonlinear refractive index change induced in semiconductors. Unlike most all-Optical Switches, the Switch-off time, as well as the Switch-on time, of this novel device is not limited by the usually slow carrier lifetime, allowing a very fast Switching speed. Its Switching characteristics are theoretically examined under various conditions. It is shown that the device offers a nearly square modulation characteristic that is suitable for most Switching applications.