The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform

Paul R Prucnal - One of the best experts on this subject based on the ideXlab platform.

  • compact optical steganography based on amplified Spontaneous Emission Noise
    IEEE Photonics Conference, 2015
    Co-Authors: Matthew P Chang, Bhavin J Shastri, Alexander N Tait, Paul R Prucnal
    Abstract:

    We experimentally demonstrate a compact optical steganography method using chirped fiber Bragg gratings. The stealth signals are carried by wide band amplified Spontaneous Emission Noise, which has strong dispersion effect for pulse stretching.

  • wdm optical steganography based on amplified Spontaneous Emission Noise
    Optics Letters, 2014
    Co-Authors: Alexander N Tait, Matthew P Chang, Paul R Prucnal
    Abstract:

    We propose and experimentally demonstrate a wavelength-division multiplexed (WDM) optical stealth transmission system carried by amplified Spontaneous Emission (ASE) Noise. The stealth signal is hidden in both time and frequency domains by using ASE Noise as the signal carrier. Each WDM channel uses part of the ASE spectrum, which provides more flexibility to apply stealth transmission in a public network and adds another layer of security to the stealth channel. Multi-channel transmission also increases the overall channel capacity, which is the major limitation of the single stealth channel transmission based on ASE Noise. The relations between spectral bandwidth and coherence length of ASE carrier have been theoretically analyzed and experimentally investigated.

  • two dimensional encrypted optical steganography based on amplified Spontaneous Emission Noise
    Conference on Lasers and Electro-Optics, 2013
    Co-Authors: Zhenxing Wang, Bhavin J Shastri, Yue Tian, Paul R Prucnal
    Abstract:

    We demonstrate an optical steganography method with two dimensional encryption to dramatically improve the privacy of optical networks. The transmitted stealth signal carried by Noise is secretly hidden under the public channel.

  • optical steganography based on amplified Spontaneous Emission Noise
    Optics Express, 2013
    Co-Authors: Zhenxing Wang, Bhavin J Shastri, Yue Tian, Mable P Fok, Daniel R Kanoff, Paul R Prucnal
    Abstract:

    We propose and experimentally demonstrate an optical steganography method in which a data signal is transmitted using amplified Spontaneous Emission (ASE) Noise as a carrier. The ASE serving as a carrier for the private signal has an identical frequency spectrum to the existing Noise generated by the Erbium doped fiber amplifiers (EDFAs) in the transmission system. The system also carries a conventional data channel that is not private. The so-called “stealth” or private channel is well-hidden within the Noise of the system. Phase modulation is used for both the stealth channel and the public channel. Using homodyne detection, the short coherence length of the ASE ensures that the stealth signal can only be recovered if the receiver closely matches the delay-length difference, which is deliberately changed in a dynamic fashion that is only known to the transmitter and its intended receiver.

  • Phase-mask covered optical steganography based on amplified Spontaneous Emission Noise
    2013 IEEE Photonics Conference, 2013
    Co-Authors: Ben Wu, Bhavin J Shastri, Yue Tian, Zhenxing Wang, Paul R Prucnal
    Abstract:

    Phase mask encryption is proposed to improve the transmission privacy of an optical steganography system. The stealth signal carried by amplified Spontaneous Emission Noise is encrypted by a fast changing code.

Toshihiko Makino - One of the best experts on this subject based on the ideXlab platform.

  • Transfer-Matrix Formulation of Spontaneous Emission Noise of DFB
    1991
    Co-Authors: Toshihiko Makino
    Abstract:

    Absfract-A unified formulation of the Spontaneous Emission Noise in semiconductor DFB lasers is presented by using a transfer-matrix approach. Analytical expressions for the Noise power per unit frequency bandwidth below threshold and the Spontaneous Emission rate into the lasing mode are obtained based on the Green’s function method. Three DFB laser structures are analyzed: 1) a standard DFB structure with facet reflectivities, 2) a multisection DFB structure composed of n sections, which models a phase-shifted DFB laser and a multielectrode (tunable) DFB laser, and 3) a periodic layered DFB structure which models a surface-emitting DFB laser. It is shown that the Spontaneous Emission Noise of a complicated DFB laser structure can be calculated easily by the transfer matrix of each section of the structure and its derivative to frequency.

  • Transfer-matrix formulation of Spontaneous Emission Noise of DFB semiconductor lasers
    Journal of Lightwave Technology, 1991
    Co-Authors: Toshihiko Makino
    Abstract:

    A unified formulation of the Spontaneous Emission Noise in semiconductor DFB (distributed feedback) lasers is presented by using a transfer-matrix approach. Analytical expressions for the Noise power per unit frequency bandwidth below threshold and the Spontaneous Emission rate into the lasing mode are obtained based on the Green's function method. Three DFB laser structures are analyzed: (1) a standard DFB structure with facet reflectivities, (2) a multisection DFB structure composed of n sections which models a phase-shifted DFB laser and a multielectrode (tunable) DFB laser, and (3) a periodic layered DFB structure which models a surface-emitting DFB laser. It is shown that the Spontaneous Emission Noise of a complicated DFB laser structure can be calculated easily by the transfer matrix of each section of the structure and its derivative to frequency. >

H A Haus - One of the best experts on this subject based on the ideXlab platform.

Polina Bayvel - One of the best experts on this subject based on the ideXlab platform.

  • impact of transceiver subsystems on digital back propagation performance
    IEEE Photonics Conference, 2018
    Co-Authors: Lidia Galdino, Daniel Semrau, Polina Bayvel
    Abstract:

    The potential, limitations and practicalities of digital back propagation is investigated in the presence of Noise arising from amplifier Spontaneous Emission Noise a well as from a non-ideal transceiver subsystem.

  • investigation of bandwidth loading in optical fibre transmission using amplified Spontaneous Emission Noise
    Optics Express, 2017
    Co-Authors: Daniel J Elson, Daniel Semrau, Lidia Galdino, R I Killey, Gabriel Saavedra, Kai Shi, Benn C Thomsen, Polina Bayvel
    Abstract:

    The use of spectrally shaped amplified Spontaneous Emission Noise (SS-ASE) as a method for emulating interfering channels in optical fibre transmission systems has been studied. It is shown that the use of SS-ASE leads to a slightly pessimistic performance relative to the use of conventionally modulated interfering channels in the nonlinear regime. The additional nonlinear interference Noise (on the channel under test), due to the Gaussian nature of SS-ASE, has been calculated using a combination of the Gaussian Noise (GN) and enhanced GN (EGN) models for the entire C-band (4.5 THz) and experimentally shown to provide a lower bound for transmission performance.

  • high spectral density transmission emulation using amplified Spontaneous Emission Noise
    Optics Letters, 2016
    Co-Authors: Daniel J Elson, Lidia Galdino, R I Killey, Benn C Thomsen, Robert Maher, Polina Bayvel
    Abstract:

    We demonstrate the use of spectrally shaped amplified Spontaneous Emission (SS-ASE) Noise for wideband channel loading in the investigation of nonlinear transmission limits in wavelength-division multiplexing transmission experiments using Nyquist-spaced channels. The validity of this approach is explored through statistical analysis and experimental transmission of Nyquist-spaced 10 GBaud polarization-division multiplexing (PDM) quadrature phase-shift keying and PDM-16-ary quadrature amplitude modulation (QAM) channels, co-propagated with SS-ASE over single mode fiber. It is shown that this technique, which is simpler to implement than a fully modulated comb of channels, is valid for distances exceeding 240 km for PDM-16QAM with dispersion of 16 ps/nm/km, yields a good agreement with theory, and provides a conservative measure of system performance.

  • experimental investigation of a deconvolution technique for identification of channel impairment
    Lasers and Electro-Optics Society Meeting, 2003
    Co-Authors: Y Benlachtar, R I Killey, Polina Bayvel
    Abstract:

    This study experimentally demonstrates that the implemented deconvolution technique can accurately estimate the standard deviation due to amplified Spontaneous Emission Noise (ASE) Noise without prior knowledge of the transmission path. As a consequence, a correct deconvolution and separation of sources of impairment from the histogram is possible.

Michael J. Adams - One of the best experts on this subject based on the ideXlab platform.

  • Theory of Spontaneous Emission Noise in multisection semiconductor lasers
    Journal of Lightwave Technology, 2005
    Co-Authors: Rodney Loudon, D. Ramoo, Michael J. Adams
    Abstract:

    Calculations of Spontaneous Emission Noise in semiconductor lasers are mainly based on a fundamental theory developed by Henry in 1986, which is useful for simple systems, together with a formulation in terms of transfer matrices by Makino and others, which facilitates application of the theory to more complicated multisection systems. The aim of this review is to present a unified account of this theoretical work in a transparent form intended to encourage its further use in complex systems. The opportunity is taken to strengthen the existing theory by including the effects of differing optical wave vectors in different sections and the consequent reflections at interfaces, which are important in some applications. Sample calculations are presented for a range of systems with one, two, three, and four sections and the predictions compared with other theoretical and experimental results.