The Experts below are selected from a list of 1314 Experts worldwide ranked by ideXlab platform

Pu Wang - One of the best experts on this subject based on the ideXlab platform.

  • High-fidelity, low-latency polarization quantum state transmissions over a Hollow-Core conjoined-tube Fibre at around 800 nm
    2020
    Co-Authors: Chen Xin-yu, Pu Wang, Ding Wei, Wang Ying-ying, Gao Shou-fei, Xu Fei-xiang, Xu Hui-chao, Hong Yi-feng, Sun Yi-zhi, Lu Yan-qing
    Abstract:

    The performances of optical Fibre-based quantum information systems are limited by the intrinsic properties of silica glass materials, e.g. high latency, Rayleigh-scattering loss wavelength scaling law, and cross-coupling induced modal impurity. Hollow-Core optical Fibre (HCF) promises to unify air-borne light propagation and non-line-of-sight transmission, thus holding great potentials for versatile photonics-based quantum infor-mation applications. The early version of HCF based on photonic-bandgap guidance has not proven itself as a reliable quantum channel because of the poor modal purity in both spatial and polarization domains, as well as significant difficulty in fabrication when the wavelength shifts to the visible region. In this work, based on the polarization degree of freedom, we first, to the best of our knowledge, demonstrate high-fidelity (~0.98) single-photon transmission and distribution of entangled photons over a conjoined-tube Hollow-Core Fibre (CTF) by using commercial silicon single-photon avalanche photodiodes. Our CTF realized the combined merits of low loss, high spatial mode purity, low polarization degradation, and low chromatic dispersion. We also demonstrate single-photon low latency (~99.96% speed of light in vacuum) transmission, thus paving the way for extensive uses of HCF links in versatile polarization-based quantum information processing

  • ultrafast deep and vacuum ultraviolet gas filled Hollow Core Fibre sources for time resolved photoelectron spectroscopy
    European Quantum Electronics Conference, 2019
    Co-Authors: Federico Belli, Nikoleta Kotsina, Shoufei Gao, Yingying Wang, Pu Wang, J C Travers, Dave Townsend
    Abstract:

    Soliton-driven resonant dispersive-wave (RDW) emission is an established route to the generation of frequency tunable ultrafast pulses. In gas-filled anti-resonant guiding Hollow-Core photonic-crystal Fibre (HC-PCF), continuous tuning of RDW generation in both the vacuum (VUV) and deep ultraviolet (DUV) to visible (110 nm to 550 nm) has been achieved [1] and fully characterised to have a temporal duration of a few fs in DUV [2]. Due to the high conversion efficiency (up to 10%), relatively low pump energies are required (few μJ) to get useful UV energy, and so high repetition-rate pump sources can be used [3]. Furthermore, the generated UV emission reproduces the polarization state of the pump pulse. Combined, all of these features make RDW-emission in gasfilled HC-PCF an ideal, and rather unique, source for ultrafast pump-probe spectroscopy in the ultraviolet region.

  • Hollow Core conjoined tube negative curvature Fibre with ultralow loss
    Nature Communications, 2018
    Co-Authors: Yingying Wang, Wei Ding, Dongliang Jiang, Shuai Gu, Xin Zhang, Pu Wang
    Abstract:

    Countering the optical network ‘capacity crunch’ calls for a radical development in optical Fibres that could simultaneously minimize nonlinearity penalties, chromatic dispersion and maximize signal launch power. Hollow-Core Fibres (HCF) can break the nonlinear Shannon limit of solid-Core Fibre and fulfil all above requirements, but its optical performance need to be significantly upgraded before they can be considered for high-capacity telecommunication systems. Here, we report a new HCF with conjoined-tubes in the cladding and a negative-curvature Core shape. It exhibits a minimum transmission loss of 2 dB km−1 at 1512 nm and a <16 dB km−1 bandwidth spanning across the O, E, S, C, L telecom bands (1302–1637 nm). The debut of this conjoined-tube HCF, with combined merits of ultralow loss, broad bandwidth, low bending loss, high mode quality and simple structure heralds a new opportunity to fully unleash the potential of HCF in telecommunication applications. Countering the optical network ‘capacity crunch’ requires developments in optical Fibres. Here, the authors report a Hollow-Core Fibre with conjoined tubes in the cladding and a negative-curvature Core shape. It exhibits a transmission loss of 2 dB/km at 1512 nm and less than 16 dB/km bandwidth in the 1302–1637 nm range.

Kyung Taec Kim - One of the best experts on this subject based on the ideXlab platform.

  • Generation of a single-cycle pulse using a two-stage compressor and its temporal characterization using a tunnelling ionization method
    Nature Publishing Group, 2019
    Co-Authors: Sung In Hwang, Seung Beom Park, Jehoi Mun, Wosik Cho, Chang Hee Nam, Kyung Taec Kim
    Abstract:

    Abstract A single-cycle laser pulse was generated using a two-stage compressor and characterized using a pulse characterization technique based on tunnelling ionization. A 25-fs, 800-nm laser pulse was compressed to 5.5 fs using a gas-filled Hollow-Core Fibre and a set of chirped mirrors. The laser pulse was further compressed, down to the single-cycle limit by propagation through multiple fused-silica plates and another set of chirped mirrors. The two-stage compressor mitigates the development of higher-order dispersion during spectral broadening. Thus, a single-cycle pulse was generated by compensating the second-order dispersion using chirped mirrors. The duration of the single-cycle pulse was 2.5 fs, while its transform-limited duration was 2.2 fs. A continuum extreme ultraviolet spectrum was obtained through high-harmonic generation without applying any temporal gating technique. The continuum spectrum was shown to have a strong dependence on the carrier-envelope phase of the laser pulse, confirming the generation of a single-cycle pulse

  • Generation of a single-cycle pulse using a two-stage compressor and its temporal characterization using a tunnelling ionization method
    NATURE PUBLISHING GROUP, 2019
    Co-Authors: Sung In Hwang, Seung Beom Park, Jehoi Mun, Wosik Cho, Chang Hee Nam, Kyung Taec Kim
    Abstract:

    A single-cycle laser pulse was generated using a two-stage compressor and characterized using a pulse characterization technique based on tunnelling ionization. A 25-fs, 800-nm laser pulse was compressed to 5.5 fs using a gas-filled Hollow-Core Fibre and a set of chirped mirrors. The laser pulse was further compressed, down to the single-cycle limit by propagation through multiple fused-silica plates and another set of chirped mirrors. The two-stage compressor mitigates the development of higher-order dispersion during spectral broadening. Thus, a single-cycle pulse was generated by compensating the second-order dispersion using chirped mirrors. The duration of the single-cycle pulse was 2.5 fs, while its transform-limited duration was 2.2 fs. A continuum extreme ultraviolet spectrum was obtained through high-harmonic generation without applying any temporal gating technique. The continuum spectrum was shown to have a strong dependence on the carrier-envelope phase of the laser pulse, confirming the generation of a single-cycle pulse. © 2019, The Author(s

Francesco Poletti - One of the best experts on this subject based on the ideXlab platform.

  • low thermal sensitivity Hollow Core Fibre for optically switched data centre applications
    Journal of Lightwave Technology (2020) (In press)., 2020
    Co-Authors: Kari Clark, T D Bradley, Francesco Poletti, D J Richardson, Yingkan Chen, Numkam E Fokoua, P Bayvel, Radan Slavik
    Abstract:

    We demonstrate 20-times greater tolerance to temperature variation using Hollow Core Fibres compared to SMF-28 in a fast optical switching system. With frequency and once-only phase synchronisation, we obtained error-free transmission of short packets with <625ps clock recovery time in 25.6 Gb/s real-time systems.

  • multiport micro optic devices for Hollow Core Fibre applications
    European Conference on Optical Communication, 2019
    Co-Authors: Yongmin Jung, T D Bradley, J R Hayes, Gregory T Jasion, Ian A Davidson, H Sakr, Yong Chen, Francesco Poletti, D J Richardson
    Abstract:

    Using micro-optic collimator technology, we present fully integrated 3-port Hollow-Core-Fibre (HCF) components (e.g. 1×2 beam-splitter and WDM coupler), thereby increasing the diversity of inline HCF components and facilitating the use of HCF in a broader range of Fibre optic applications.

  • exploring the stability and repeatability of a Hollow Core Fibre raman gas sensor
    Seventh European Workshop on Optical Fibre Sensors, 2019
    Co-Authors: Matthew Partridge, T D Bradley, J R Hayes, Ian A Davidson, Francesco Poletti, G T Jasion, William Brooks, Michael Foster, M N Petrovich, D J Richardson
    Abstract:

    In this paper we present an exploration of the stability and repeatability of a Hollow Core microstructured Fibre (HCMOF) Raman gas sensor. Raman gas detection using HC-MOFs is an exciting technique as it enables high sensitivity, multi-species detection using a small gas volume and within a small physical space. Several previous works have demonstrated the utility of HC-MOF Fibres as Raman gas cells for the detection of a wide range of gas species such as methane and hydrogen. Here we take a first look at the Raman signal stability (in a single Fibre) and signal reproducibility (from Fibre-to-Fibre). We show that a HC-MOF Raman system can achieve low within-day variability of 0.3 %CV and Fibre-to-Fibre variability of 7.6 %CV. Understanding the error within systems such as the one presented is critical in the development of HC-MOF-based gas sensors for practical applications.

  • lotus shaped negative curvature Hollow Core Fibre with 10 5 db km at 1550 nm wavelength
    European Conference on Optical Communication, 2017
    Co-Authors: M B S Nawazuddin, T D Bradley, J R Hayes, Gregory T Jasion, D J Richardson, S R Sandoghchi, N V Wheeler, M A Gouveia, Francesco Poletti
    Abstract:

    We present a novel negative curvature antiresonant Hollow Core Fibre design with the potential for low loss and very wide bandwidth. A low loss of 10.5 dB/km at 1550 nm is demonstrated, showing its potential for use in data transmission and high power beam delivery applications.

Yingying Wang - One of the best experts on this subject based on the ideXlab platform.

  • ultrafast deep and vacuum ultraviolet gas filled Hollow Core Fibre sources for time resolved photoelectron spectroscopy
    European Quantum Electronics Conference, 2019
    Co-Authors: Federico Belli, Nikoleta Kotsina, Shoufei Gao, Yingying Wang, Pu Wang, J C Travers, Dave Townsend
    Abstract:

    Soliton-driven resonant dispersive-wave (RDW) emission is an established route to the generation of frequency tunable ultrafast pulses. In gas-filled anti-resonant guiding Hollow-Core photonic-crystal Fibre (HC-PCF), continuous tuning of RDW generation in both the vacuum (VUV) and deep ultraviolet (DUV) to visible (110 nm to 550 nm) has been achieved [1] and fully characterised to have a temporal duration of a few fs in DUV [2]. Due to the high conversion efficiency (up to 10%), relatively low pump energies are required (few μJ) to get useful UV energy, and so high repetition-rate pump sources can be used [3]. Furthermore, the generated UV emission reproduces the polarization state of the pump pulse. Combined, all of these features make RDW-emission in gasfilled HC-PCF an ideal, and rather unique, source for ultrafast pump-probe spectroscopy in the ultraviolet region.

  • Hollow Core conjoined tube negative curvature Fibre with ultralow loss
    Nature Communications, 2018
    Co-Authors: Yingying Wang, Wei Ding, Dongliang Jiang, Shuai Gu, Xin Zhang, Pu Wang
    Abstract:

    Countering the optical network ‘capacity crunch’ calls for a radical development in optical Fibres that could simultaneously minimize nonlinearity penalties, chromatic dispersion and maximize signal launch power. Hollow-Core Fibres (HCF) can break the nonlinear Shannon limit of solid-Core Fibre and fulfil all above requirements, but its optical performance need to be significantly upgraded before they can be considered for high-capacity telecommunication systems. Here, we report a new HCF with conjoined-tubes in the cladding and a negative-curvature Core shape. It exhibits a minimum transmission loss of 2 dB km−1 at 1512 nm and a <16 dB km−1 bandwidth spanning across the O, E, S, C, L telecom bands (1302–1637 nm). The debut of this conjoined-tube HCF, with combined merits of ultralow loss, broad bandwidth, low bending loss, high mode quality and simple structure heralds a new opportunity to fully unleash the potential of HCF in telecommunication applications. Countering the optical network ‘capacity crunch’ requires developments in optical Fibres. Here, the authors report a Hollow-Core Fibre with conjoined tubes in the cladding and a negative-curvature Core shape. It exhibits a transmission loss of 2 dB/km at 1512 nm and less than 16 dB/km bandwidth in the 1302–1637 nm range.

D J Richardson - One of the best experts on this subject based on the ideXlab platform.

  • low thermal sensitivity Hollow Core Fibre for optically switched data centre applications
    Journal of Lightwave Technology (2020) (In press)., 2020
    Co-Authors: Kari Clark, T D Bradley, Francesco Poletti, D J Richardson, Yingkan Chen, Numkam E Fokoua, P Bayvel, Radan Slavik
    Abstract:

    We demonstrate 20-times greater tolerance to temperature variation using Hollow Core Fibres compared to SMF-28 in a fast optical switching system. With frequency and once-only phase synchronisation, we obtained error-free transmission of short packets with <625ps clock recovery time in 25.6 Gb/s real-time systems.

  • multiport micro optic devices for Hollow Core Fibre applications
    European Conference on Optical Communication, 2019
    Co-Authors: Yongmin Jung, T D Bradley, J R Hayes, Gregory T Jasion, Ian A Davidson, H Sakr, Yong Chen, Francesco Poletti, D J Richardson
    Abstract:

    Using micro-optic collimator technology, we present fully integrated 3-port Hollow-Core-Fibre (HCF) components (e.g. 1×2 beam-splitter and WDM coupler), thereby increasing the diversity of inline HCF components and facilitating the use of HCF in a broader range of Fibre optic applications.

  • exploring the stability and repeatability of a Hollow Core Fibre raman gas sensor
    Seventh European Workshop on Optical Fibre Sensors, 2019
    Co-Authors: Matthew Partridge, T D Bradley, J R Hayes, Ian A Davidson, Francesco Poletti, G T Jasion, William Brooks, Michael Foster, M N Petrovich, D J Richardson
    Abstract:

    In this paper we present an exploration of the stability and repeatability of a Hollow Core microstructured Fibre (HCMOF) Raman gas sensor. Raman gas detection using HC-MOFs is an exciting technique as it enables high sensitivity, multi-species detection using a small gas volume and within a small physical space. Several previous works have demonstrated the utility of HC-MOF Fibres as Raman gas cells for the detection of a wide range of gas species such as methane and hydrogen. Here we take a first look at the Raman signal stability (in a single Fibre) and signal reproducibility (from Fibre-to-Fibre). We show that a HC-MOF Raman system can achieve low within-day variability of 0.3 %CV and Fibre-to-Fibre variability of 7.6 %CV. Understanding the error within systems such as the one presented is critical in the development of HC-MOF-based gas sensors for practical applications.

  • lotus shaped negative curvature Hollow Core Fibre with 10 5 db km at 1550 nm wavelength
    European Conference on Optical Communication, 2017
    Co-Authors: M B S Nawazuddin, T D Bradley, J R Hayes, Gregory T Jasion, D J Richardson, S R Sandoghchi, N V Wheeler, M A Gouveia, Francesco Poletti
    Abstract:

    We present a novel negative curvature antiresonant Hollow Core Fibre design with the potential for low loss and very wide bandwidth. A low loss of 10.5 dB/km at 1550 nm is demonstrated, showing its potential for use in data transmission and high power beam delivery applications.