The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform

Songhao Liu - One of the best experts on this subject based on the ideXlab platform.

  • characterization of passive Optical components with ultra fast speed and high resolution based on dd ofdm
    Optics Express, 2012
    Co-Authors: Banghong Guo, Yuan Bao, Xingwen Yi, Zhaohui Li, Tao Gui, Jianping Li, Xinhuan Feng, Songhao Liu
    Abstract:

    The passive Optical components with very fine structures in wavelength domain are very sensitive to the mechanical vibrations or thermal fluctuations. If the measurement speed is lower than the temperature and mechanical fluctuation, we cannot measure the dynamic characteristics of the Optical components. In this paper, we propose and demonstrate a novel method with ultra-fast measurement speed and high-resolution based on Optical Channel estimation using direct-detected orthogonal frequency division multiplexing (DD-OFDM) signal, which can be used to measure the dynamic characteristics and fine structure of the passive Optical components. In experiment, by using fast Fourier transform (FFT) and a low-cost electro-absorption modulated laser (EML), we can achieve the transfer function characteristics with 3.9MHz resolution. Compared with the Optical Channel estimation using coherent OFDM signal reported before, the proposed measurement technique is cost-effective.

Amber Sultan - One of the best experts on this subject based on the ideXlab platform.

  • key distribution based on phase fluctuation between polarization modes in Optical Channel
    IEEE Photonics Technology Letters, 2018
    Co-Authors: Adnan A E Hajomer, Xuelin Yang, Amber Sultan
    Abstract:

    This letter proposes and experimentally demonstrates an approach for generating and sharing a secret key based on the random phase fluctuation between orthogonal polarization modes (OPMs). A delay interferometer (DI) is placed to extract the phase differences inside the Optical Channel, where reconfigurable lengths of polarization-maintaining fiber are applied as the main source of fluctuation. It is proven that the output signals from the DI can generate random and highly correlated waveforms that can be extracted as the key and shared between the two communication parties. Due to the environment-related randomness and Channel-dependent uniqueness of phase fluctuation in OPMs, the security enhancement of the proposed scheme is evaluated with the capability against various tapping attacks. As a proof of concept, the key generation rate of 220 bits/s with bit-error rate of 5% is successfully demonstrated over 25-km standard single-mode fiber. Moreover, the proposed scheme has the advantage of low cost, compatible with current Optical fiber networks, and suitable for long-distance transmission, since Optical amplifiers can be applied.

Ray T. Chen - One of the best experts on this subject based on the ideXlab platform.

  • Polymer waveguide-based high-speed clock signal distribution system
    Optoelectronic Interconnects and Packaging IV, 1997
    Co-Authors: Ting Li, Michael Dubinovsky, Randy W. Wickman, Linghui Wu, Feiming Li, Suning Tang, Ray T. Chen
    Abstract:

    The increasing demand for clock speed is rapidly exhausting capabilities of interconnection techniques currently employed for high performance supercomputers. In order to address the bottleneck problem at the board level, we have taken a system's approach in developing optoelectronic interconnection layer for board-level high speed Optical clock signal distribution. The reported approach employs polymer Optical Channel waveguides, waveguide clock signal distribution. The reported approach employs polymer based Optical Channel waveguides, waveguide splitters, and surface-normal waveguide couplers. This paper describes the system architecture, material choice, and fabrication process of board-level waveguides devices to achieve a synchronous global clock signal distribution.© (1997) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

  • Board-level Optical clock signal distribution based on guided-wave Optical interconnects in conjunction with waveguide holograms
    Proceedings of SPIE, 1996
    Co-Authors: Ray T. Chen, Linghui Wu, Feiming Li, Suning Tang, Ting Li, Randy W. Wickman
    Abstract:

    In this paper, we represent our effort to construct an optoelectronic interconnection layer for high-speed Optical clock signal distribution in a Cray supercomputer board. The optoelectronic interconnection layer under investigation employs Optical Channel waveguides and 3 dB waveguide splitters in conjunction with surface-normal waveguide couplers. The difficulties associated with the complicated 3D multiple alignments are significantly reduced by the surface-normal fanout beams and the unique planar device feature. 1-GHz clear Optical clock signal is demonstrated experimentally with a guided-wave interconnection length of 45 cm. Some new techniques to fabricate large-area Optical Channel waveguides and surface-normal waveguide grating couplers are also presented.© (1996) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

  • Polymer waveguide-based 1-GHz clock signal distribution system
    Optical Characterization Techniques for High-Performance Microelectronic Device Manufacturing III, 1996
    Co-Authors: Ting Li, Michael Dubinovsky, Randy W. Wickman, Linghui Wu, Feiming Li, Suning Tang, Ray T. Chen
    Abstract:

    We present our effort to construct an optoelectronic interconnection layer for Cray supercomputer board for board-level fast Optical clock signal distribution. The Optical interconnection layer under investigation employs Optical Channel waveguides with surface-normal waveguide couplers. The difficulties associated with the complicated 3-D multiple alignments are significantly reduced through the parallelism among the surface-normal fanout beams and the unique planar device feature. One-GHz Optical clock signal is demonstrated experimentally with a guided-wave interconnection length of 45 cm. Some new techniques to fabricate multimode Optical Channel waveguides and 2-D array of surface-normal waveguide holographic gratings on board- level are also presented.

Banghong Guo - One of the best experts on this subject based on the ideXlab platform.

  • characterization of passive Optical components with ultra fast speed and high resolution based on dd ofdm
    Optics Express, 2012
    Co-Authors: Banghong Guo, Yuan Bao, Xingwen Yi, Zhaohui Li, Tao Gui, Jianping Li, Xinhuan Feng, Songhao Liu
    Abstract:

    The passive Optical components with very fine structures in wavelength domain are very sensitive to the mechanical vibrations or thermal fluctuations. If the measurement speed is lower than the temperature and mechanical fluctuation, we cannot measure the dynamic characteristics of the Optical components. In this paper, we propose and demonstrate a novel method with ultra-fast measurement speed and high-resolution based on Optical Channel estimation using direct-detected orthogonal frequency division multiplexing (DD-OFDM) signal, which can be used to measure the dynamic characteristics and fine structure of the passive Optical components. In experiment, by using fast Fourier transform (FFT) and a low-cost electro-absorption modulated laser (EML), we can achieve the transfer function characteristics with 3.9MHz resolution. Compared with the Optical Channel estimation using coherent OFDM signal reported before, the proposed measurement technique is cost-effective.

Joseph T. Boyd - One of the best experts on this subject based on the ideXlab platform.

  • Near field measurements of Optical Channel waveguide structures
    Ultramicroscopy, 1995
    Co-Authors: Howard E. Jackson, Susan M. Lindsay, C. D. Poweleit, David H. Naghski, Gregory N. De Brabander, Joseph T. Boyd
    Abstract:

    Abstract Near field scanning Optical microscopy (NSOM) has been used to investigate the guided mode intensity distribution in Optical Channel waveguides, phase-matched directional couplers, and symmetric Y-junctions. A near field measurement of the guided mode intensity profile across the Optical Channel waveguide has been performed and compared with model calculations. The near field guided mode intensity profiles above the waveguides were measured as a function of distance along the propagation direction of both a directional coupler and a Y-junction, providing a near field view of the spatial evolution of Optical power in these structures.

  • Photon scanning tunneling microscopy of Optical Channel waveguides
    Ultramicroscopy, 1995
    Co-Authors: Ahn Goo Choo, Howard E. Jackson, Gregory N. De Brabander, Mona H. Chudgar, Mukesh Kumar, Joseph T. Boyd
    Abstract:

    Abstract Photon scanning tunneling microscopy (PSTM) has been used to characterize Optical Channel waveguides. Both He Ne laser and semiconductor diode laser wavelengths are utilized in the measurement of the evanescent field intensity associated with the propagating modes of Optical waveguides. A tapered Optical fiber tip, and also a semiconductor heterostructure tip attached to an Optical fiber are employed for detection. Local values of effective refractive index are calculated from measurements of both TE and TM polarizations and compared to model calculations.

  • Near-field measurements of Optical Channel waveguide structures
    Integrated Optics and Microstructures II, 1994
    Co-Authors: Ahn Goo Choo, Howard E. Jackson, Gregory N. De Brabander, U. Thiel, Joseph T. Boyd
    Abstract:

    Near field scanning Optical microscopy (NSOM) has been used to investigate the guided mode intensity distribution in Optical Channel waveguides, phase-matched directional couplers, and symmetric Y- junctions. A near field measurement of the lateral guided mode intensity profile was performed across the Optical Channel waveguide, and compared with model calculations. The near field guided mode intensity profiles above the waveguides were measured as a function of distance along both a directional coupler and a Y-junction, providing a near field view of the spatial evolution of Optical power in these structures.© (1994) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

  • Near field measurements of Optical Channel waveguides and directional couplers
    Applied Physics Letters, 1994
    Co-Authors: Ahn Goo Choo, Howard E. Jackson, Gregory N. De Brabander, U. Thiel, Joseph T. Boyd
    Abstract:

    Near field microscopy is used to investigate the guided mode intensity distribution of Optical Channel waveguides and directional couplers with subwavelength spatial resolution. The directional coupler consisted of two single mode Optical ridge Channel waveguides formed with silicon nitride deposited on a lower cladding layer of SiO2 on a silicon substrate. A near field measurement of the guided mode intensity profile in the transverse direction parallel to the waveguide surface was performed across one of the Optical Channel waveguides. These variations are compared with model calculations. Similar transverse measurements of light propagating through a directional coupler were performed at many locations along the coupler, providing a view of the evolution of Optical power transfer.