The Experts below are selected from a list of 2697 Experts worldwide ranked by ideXlab platform

Sangyoon Han - One of the best experts on this subject based on the ideXlab platform.

  • Multicast silicon photonic MEMS switches with gap-adjustable directional couplers.
    Optics express, 2019
    Co-Authors: Sangyoon Han, Tae Joon Seok, Chang-kyu Kim, Richard S. Muller
    Abstract:

    We report on 4x20 silicon photonic MEMS switch that is capable of multicasting. The switch is built on passive optical Crossbar Network with gap-adjustable directional couplers. The switch has high on-off extinction ratio (59 dB), low insertion loss (< 4.0 dB), small footprint (1.2x4.5 mm2), and fast response (9.8 µs). The switching voltage is 9.6 V and 20 dB bandwidth is 31.5 nm. One-to-two and one-to-four multicast operations are demonstrated.

  • Large-scale silicon photonic switches with movable directional couplers
    Optica, 2015
    Co-Authors: Sangyoon Han, Byung-wook Yoo, Tae Joon Seok, Niels Quack, Ming C. Wu
    Abstract:

    Fast optical circuit switches (OCSs) with high port count offer reconfigurable bandwidth in optical Networks and have the potential to significantly increase the performance and efficiency of modern datacenters. In this paper, we report on a new type of integrated OCS that combines silicon photonics with MEMS actuation. The switch is built on a 50×50 passive Crossbar Network with very low optical loss (0.04 dB/crossing). Efficient switching is achieved by a pair of directional couplers with moving waveguides and an actuation voltage of 14 V. 2500 MEMS-actuated directional coupler switches have been integrated with the Crossbar Network to form a strictly nonblocking 50×50 OCS on a 9  mm×9  mm chip. The measured switching time is 2.5 μs, and the extinction ratio is 26 dB. To our knowledge, this is the largest silicon photonic switch reported to date. The switch architecture is highly scalable because the light travels through only one active switching element, regardless of the size of the switch.

Tae Joon Seok - One of the best experts on this subject based on the ideXlab platform.

  • Multicast silicon photonic MEMS switches with gap-adjustable directional couplers.
    Optics express, 2019
    Co-Authors: Sangyoon Han, Tae Joon Seok, Chang-kyu Kim, Richard S. Muller
    Abstract:

    We report on 4x20 silicon photonic MEMS switch that is capable of multicasting. The switch is built on passive optical Crossbar Network with gap-adjustable directional couplers. The switch has high on-off extinction ratio (59 dB), low insertion loss (< 4.0 dB), small footprint (1.2x4.5 mm2), and fast response (9.8 µs). The switching voltage is 9.6 V and 20 dB bandwidth is 31.5 nm. One-to-two and one-to-four multicast operations are demonstrated.

  • Large-scale silicon photonic switches with movable directional couplers
    Optica, 2015
    Co-Authors: Sangyoon Han, Byung-wook Yoo, Tae Joon Seok, Niels Quack, Ming C. Wu
    Abstract:

    Fast optical circuit switches (OCSs) with high port count offer reconfigurable bandwidth in optical Networks and have the potential to significantly increase the performance and efficiency of modern datacenters. In this paper, we report on a new type of integrated OCS that combines silicon photonics with MEMS actuation. The switch is built on a 50×50 passive Crossbar Network with very low optical loss (0.04 dB/crossing). Efficient switching is achieved by a pair of directional couplers with moving waveguides and an actuation voltage of 14 V. 2500 MEMS-actuated directional coupler switches have been integrated with the Crossbar Network to form a strictly nonblocking 50×50 OCS on a 9  mm×9  mm chip. The measured switching time is 2.5 μs, and the extinction ratio is 26 dB. To our knowledge, this is the largest silicon photonic switch reported to date. The switch architecture is highly scalable because the light travels through only one active switching element, regardless of the size of the switch.

Ming C. Wu - One of the best experts on this subject based on the ideXlab platform.

  • Large-scale silicon photonic switches with movable directional couplers
    Optica, 2015
    Co-Authors: Sangyoon Han, Byung-wook Yoo, Tae Joon Seok, Niels Quack, Ming C. Wu
    Abstract:

    Fast optical circuit switches (OCSs) with high port count offer reconfigurable bandwidth in optical Networks and have the potential to significantly increase the performance and efficiency of modern datacenters. In this paper, we report on a new type of integrated OCS that combines silicon photonics with MEMS actuation. The switch is built on a 50×50 passive Crossbar Network with very low optical loss (0.04 dB/crossing). Efficient switching is achieved by a pair of directional couplers with moving waveguides and an actuation voltage of 14 V. 2500 MEMS-actuated directional coupler switches have been integrated with the Crossbar Network to form a strictly nonblocking 50×50 OCS on a 9  mm×9  mm chip. The measured switching time is 2.5 μs, and the extinction ratio is 26 dB. To our knowledge, this is the largest silicon photonic switch reported to date. The switch architecture is highly scalable because the light travels through only one active switching element, regardless of the size of the switch.

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

  • Multicast silicon photonic MEMS switches with gap-adjustable directional couplers.
    Optics express, 2019
    Co-Authors: Sangyoon Han, Tae Joon Seok, Chang-kyu Kim, Richard S. Muller
    Abstract:

    We report on 4x20 silicon photonic MEMS switch that is capable of multicasting. The switch is built on passive optical Crossbar Network with gap-adjustable directional couplers. The switch has high on-off extinction ratio (59 dB), low insertion loss (< 4.0 dB), small footprint (1.2x4.5 mm2), and fast response (9.8 µs). The switching voltage is 9.6 V and 20 dB bandwidth is 31.5 nm. One-to-two and one-to-four multicast operations are demonstrated.

L. Petit - One of the best experts on this subject based on the ideXlab platform.

  • A Crossbar Network for Silicon Quantum Dot Qubits
    Science advances, 2018
    Co-Authors: L. Petit, David P. Franke, Juan P. Dehollain, Jonas Helsen, Mark Steudtner, Thomas Nicole K, Yoscovits Zachary R, Singh Kanwaljit, Stephanie Wehner
    Abstract:

    The spin states of single electrons in gate-defined quantum dots satisfy crucial requirements for a practical quantum computer. These include extremely long coherence times, high-fidelity quantum operation, and the ability to shuttle electrons as a mechanism for on-chip flying qubits. In order to increase the number of qubits to the thousands or millions of qubits needed for practical quantum information we present an architecture based on shared control and a scalable number of lines. Crucially, the control lines define the qubit grid, such that no local components are required. Our design enables qubit coupling beyond nearest neighbors, providing prospects for non-planar quantum error correction protocols. Fabrication is based on a three-layer design to define qubit and tunnel barrier gates. We show that a double stripline on top of the structure can drive high-fidelity single-qubit rotations. Qubit addressability and readout are enabled by self-aligned inhomogeneous magnetic fields induced by direct currents through superconducting gates. Qubit coupling is based on the exchange interaction, and we show that parallel two-qubit gates can be performed at the detuning noise insensitive point. While the architecture requires a high level of uniformity in the materials and critical dimensions to enable shared control, it stands out for its simplicity and provides prospects for large-scale quantum computation in the near future.

  • a Crossbar Network for silicon quantum dot qubits
    Science Advances, 2018
    Co-Authors: L. Petit, David P. Franke, Juan P. Dehollain, Jonas Helsen, Mark Steudtner, Nicole K Thomas
    Abstract:

    The spin states of single electrons in gate-defined quantum dots satisfy crucial requirements for a practical quantum computer. These include extremely long coherence times, high-fidelity quantum operation, and the ability to shuttle electrons as a mechanism for on-chip flying qubits. To increase the number of qubits to the thousands or millions of qubits needed for practical quantum information, we present an architecture based on shared control and a scalable number of lines. Crucially, the control lines define the qubit grid, such that no local components are required. Our design enables qubit coupling beyond nearest neighbors, providing prospects for nonplanar quantum error correction protocols. Fabrication is based on a three-layer design to define qubit and tunnel barrier gates. We show that a double stripline on top of the structure can drive high-fidelity single-qubit rotations. Self-aligned inhomogeneous magnetic fields induced by direct currents through superconducting gates enable qubit addressability and readout. Qubit coupling is based on the exchange interaction, and we show that parallel two-qubit gates can be performed at the detuning-noise insensitive point. While the architecture requires a high level of uniformity in the materials and critical dimensions to enable shared control, it stands out for its simplicity and provides prospects for large-scale quantum computation in the near future.