The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform

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

  • psk self Homodyne Detection using a pilot carrier for multibit symbol transmission with inverse rz signal
    IEEE Photonics Technology Letters, 2005
    Co-Authors: T. Miyazaki, F. Kubota
    Abstract:

    Phase-shift-keying (PSK) self-Homodyne modulation and demodulation using a polarization-multiplexed pilot-carrier with an inverse-return-to-zero (RZ) intensity modulation signal for 2-bit/symbol transmission at 20 Gb/s was demonstrated. The pilot-carrier was generated by polarization-modulation in an orthogonal polarization state with respect to a PSK signal in the transmitter, while its polarization state was rotated by 90/spl deg/ in a LiNbO/sub 3/-based hybrid module for Homodyne Detection in the receiver. We confirm that the proposed self-Homodyne Detection scheme is insensitive to cross-modulation degradation by an inverse-RZ signal with high extinction ratio, thanks to an intensity-noise reduction capability of more than 15 dB in the Homodyne-balanced receiver. The proposed scheme offers robust PSK Homodyne Detection for multibit per symbol formats without using a complex optical phase-locked loop.

  • QPSK Homodyne Detection using a pilot carrier for multi-bit-per-symbol transmission
    (CLEO). Conference on Lasers and Electro-Optics 2005., 2005
    Co-Authors: T. Miyazaki, F. Kubota
    Abstract:

    QPSK-Homodyne Detection using a polarization-multiplexed pilot-carrier in 2-bit/symbol transmission at 20 Gb/s was demonstrated. The proposed scheme provides a simple configuration for bandwidth efficient multi-bit-per-symbol Homodyne Detection without using an optical phase-locked loop.

  • PSK self-Homodyne Detection using a pilot carrier for multibit/symbol transmission with inverse-RZ signal
    IEEE Photonics Technology Letters, 2005
    Co-Authors: T. Miyazaki, F. Kubota
    Abstract:

    Phase-shift-keying (PSK) self-Homodyne modulation and demodulation using a polarization-multiplexed pilot-carrier with an inverse-return-to-zero (RZ) intensity modulation signal for 2-bit/symbol transmission at 20 Gb/s was demonstrated. The pilot-carrier was generated by polarization-modulation in an orthogonal polarization state with respect to a PSK signal in the transmitter, while its polarization state was rotated by 90/spl deg/ in a LiNbO/sub 3/-based hybrid module for Homodyne Detection in the receiver. We confirm that the proposed self-Homodyne Detection scheme is insensitive to cross-modulation degradation by an inverse-RZ signal with high extinction ratio, thanks to an intensity-noise reduction capability of more than 15 dB in the Homodyne-balanced receiver. The proposed scheme offers robust PSK Homodyne Detection for multibit per symbol formats without using a complex optical phase-locked loop.

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

  • Pilot-Symbol-Aided Self-Homodyne Detection for High-Efficiency Optical-Fiber Transmission System
    2005 Pacific Rim Conference on Lasers & Electro-Optics, 2005
    Co-Authors: Y. Kamio, T. Miyazaki
    Abstract:

    We propose a self-Homodyne Detection for high-efficiency optical fiber transmissions. The operating principle and details of the method are shown. A spectral line width of 2.9 MHz is required at 1-dB power penalty in 8PSK, 40-Gsymbol/s.

  • psk self Homodyne Detection using a pilot carrier for multibit symbol transmission with inverse rz signal
    IEEE Photonics Technology Letters, 2005
    Co-Authors: T. Miyazaki, F. Kubota
    Abstract:

    Phase-shift-keying (PSK) self-Homodyne modulation and demodulation using a polarization-multiplexed pilot-carrier with an inverse-return-to-zero (RZ) intensity modulation signal for 2-bit/symbol transmission at 20 Gb/s was demonstrated. The pilot-carrier was generated by polarization-modulation in an orthogonal polarization state with respect to a PSK signal in the transmitter, while its polarization state was rotated by 90/spl deg/ in a LiNbO/sub 3/-based hybrid module for Homodyne Detection in the receiver. We confirm that the proposed self-Homodyne Detection scheme is insensitive to cross-modulation degradation by an inverse-RZ signal with high extinction ratio, thanks to an intensity-noise reduction capability of more than 15 dB in the Homodyne-balanced receiver. The proposed scheme offers robust PSK Homodyne Detection for multibit per symbol formats without using a complex optical phase-locked loop.

  • QPSK Homodyne Detection using a pilot carrier for multi-bit-per-symbol transmission
    (CLEO). Conference on Lasers and Electro-Optics 2005., 2005
    Co-Authors: T. Miyazaki, F. Kubota
    Abstract:

    QPSK-Homodyne Detection using a polarization-multiplexed pilot-carrier in 2-bit/symbol transmission at 20 Gb/s was demonstrated. The proposed scheme provides a simple configuration for bandwidth efficient multi-bit-per-symbol Homodyne Detection without using an optical phase-locked loop.

  • PSK self-Homodyne Detection using a pilot carrier for multibit/symbol transmission with inverse-RZ signal
    IEEE Photonics Technology Letters, 2005
    Co-Authors: T. Miyazaki, F. Kubota
    Abstract:

    Phase-shift-keying (PSK) self-Homodyne modulation and demodulation using a polarization-multiplexed pilot-carrier with an inverse-return-to-zero (RZ) intensity modulation signal for 2-bit/symbol transmission at 20 Gb/s was demonstrated. The pilot-carrier was generated by polarization-modulation in an orthogonal polarization state with respect to a PSK signal in the transmitter, while its polarization state was rotated by 90/spl deg/ in a LiNbO/sub 3/-based hybrid module for Homodyne Detection in the receiver. We confirm that the proposed self-Homodyne Detection scheme is insensitive to cross-modulation degradation by an inverse-RZ signal with high extinction ratio, thanks to an intensity-noise reduction capability of more than 15 dB in the Homodyne-balanced receiver. The proposed scheme offers robust PSK Homodyne Detection for multibit per symbol formats without using a complex optical phase-locked loop.

Rongqing Hui - One of the best experts on this subject based on the ideXlab platform.

  • Chirped Lidar Using Simplified Homodyne Detection
    Journal of Lightwave Technology, 2009
    Co-Authors: Peter Adany, Christopher Allen, Rongqing Hui
    Abstract:

    A simplified Homodyne Detection scheme for linear FM modulated lidar is presented in which pulse dechirping is performed in the optical domain. This method provides quantum limited Detection sensitivity with much less receiver complexity compared to heterodyne Detection systems. Another advantage of this approach is the reduced bandwidth requirement for the photodetector. This removes the limit on the chirp bandwidth, and enables the use of more efficient photodiodes with larger detector area. A field trial using a 5-in aperture diameter commercial telescope and a 370-m target range verified the sensitivity estimation and demonstrated the feasibility of this technique.

  • Simplified Homodyne Detection for Linear FM Lidar
    MRS Proceedings, 2008
    Co-Authors: Peter Adany, Christopher Allen, Rongqing Hui
    Abstract:

    A fiber based lidar system is developed which simplifies the processing of linear FM pulses by using a modulated local oscillator power in the coherent detector. Experiments were conducted on lidar systems with direct, heterodyne and simplified Homodyne Detection to compare receiver sensitivity. A field experiment using the Homodyne system verified the sensitivity estimation on a building target at 370-m range.

Howard J. Carmichael - One of the best experts on this subject based on the ideXlab platform.

  • Distinguishing two single-mode Gaussian states by Homodyne Detection: An information-theoretic approach
    Physical Review A, 2005
    Co-Authors: Hyunchul Nha, Howard J. Carmichael
    Abstract:

    It is known that quantum fidelity, as a measure of the closeness of two quantum states, is operationally equivalent to the minimal overlap of the probability distributions of the two states over all possible positive-operator-valued measures (POVM's); the POVM realizing the minimum is optimal. We consider the ability of Homodyne Detection to distinguish two single-mode Gaussian states and investigate to what extent it is optimal in this information-theoretic sense. We completely identify the conditions under which Homodyne Detection makes an optimal distinction between two single-mode Gaussian states of the same mean and show that, if the Gaussian states are pure, they are always optimally distinguished.

  • Vacuum fluctuations and the conditional Homodyne Detection of squeezed light
    Journal of Optics B: Quantum and Semiclassical Optics, 2004
    Co-Authors: Howard J. Carmichael, Hyunchul Nha
    Abstract:

    Conditional Homodyne Detection of quadrature squeezing is compared with standard nonconditional Detection. Whereas the latter identifies nonclassicality in a quantitative way, as a reduction of the noise power below the shot noise level, conditional Detection makes a qualitative distinction between vacuum state squeezing and squeezed classical noise. Implications of this comparison for the realistic interpretation of vacuum fluctuations (stochastic electrodynamics) are discussed.

  • Ultrafast measurement of optical-field statistics by dc-balanced Homodyne Detection
    Journal of the Optical Society of America B, 1995
    Co-Authors: Michael G. Raymer, J. Cooper, Howard J. Carmichael, Mark Beck, D. T. Smithey
    Abstract:

    The technique of dc-balanced, pulsed Homodyne Detection for the purpose of determining optical-field statistics on short time scales is analyzed theoretically. Such measurements provide photon-number and phase distributions associated with a repetitive signal light field in a short time window. Time- and space-varying signal and local-oscillator pulses are treated, thus generalizing earlier treatments of photoelectron difference statistics in Homodyne Detection. Experimental issues, such as the effects of imperfect detector balancing on (time-integrated) dc Detection and the consequences of background noise caused by non-mode-matched parts of the multimode signal field, are analyzed. The Wigner, or joint, distribution for the two field-quadrature amplitudes during the sampling time window can be directly determined by tomographic inversion of the measured photoelectron distributions. It is pointed out that Homodyne Detection provides a new method for the simultaneous measurement of temporal and spectral information. Although the theory is generally formulated, with both signal and local-oscillator fields being quantized, emphasis is placed on the limit of a strong, coherent local-oscillator field, making semiclassical interpretation possible.

Takuya Hirano - One of the best experts on this subject based on the ideXlab platform.

  • Quantum cryptography using pulsed Homodyne Detection
    Physical Review A, 2003
    Co-Authors: Takuya Hirano, H. Yamanaka, M. Ashikaga, T. Konishi, Ryo Namiki
    Abstract:

    We report an experimental quantum key distribution that utilizes pulsed Homodyne Detection, instead of photon counting, to detect weak pulses of coherent light. Although our scheme inherently has a finite error rate, Homodyne Detection allows high-efficiency Detection and quantum state measurement of the transmitted light using only conventional devices at room temperature. Our prototype system works at $1.55\ensuremath{\mu}\mathrm{m}$ wavelength and the quantum channel is a 1-km standard optical fiber. The probability distribution of the measured electric-field amplitude has a Gaussian shape. The effect of experimental imperfections such as optical loss and detector noise can be parametrized by the variance and the mean value of the Gaussian distribution.

  • Security of quantum cryptography using balanced Homodyne Detection
    Physical Review A, 2003
    Co-Authors: Ryo Namiki, Takuya Hirano
    Abstract:

    In this paper we investigate the security of a quantum cryptographic scheme which utilizes balanced Homodyne Detection and weak coherent pulses (WCP). The performance of the system is mainly characterized by the intensity of the WCP and postselected threshold. Two of the simplest intercept and resend eavesdropping attacks are analyzed. The secure key gain for a given loss is also discussed in terms of the pulse intensity and threshold.