The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform

B. Tromborg - One of the best experts on this subject based on the ideXlab platform.

  • Dynamic stimulated Brillouin scattering analysis
    Journal of Lightwave Technology, 2000
    Co-Authors: A. Djupsjobacka, C. Jacobsen, B. Tromborg
    Abstract:

    We present a new simple analysis-including the effect of spontaneous emission-of the (dynamic) influence of stimulated Brillouin scattering (SBS) on the detected receiver eye diagram. It applies in principle for general types of modulation formats such as the digital formats of amplitude shift keying (ASK), frequency shift keying (FSK), and phase shift keying (PSK). The analysis is formulated for a determination of the signal power depiction and intersymbol interference (ISI) caused by the combined effect of Fiber dispersion, Fiber Attenuation and nonlinear Fiber effects such as the effect of self-phase modulation (SPM) and SBS. The analysis allows a quantification of the dithering influence on the SBS threshold. Representative numerical examples are presented for two single-channel ON-OFF modulated 10-Gh/s systems utilizing Franz-Keldysh and Mach-Zehnder-type modulators.

P.n. Morgan - One of the best experts on this subject based on the ideXlab platform.

  • Parametric four-photon mixing followed by stimulated Raman scattering with optical pulses in birefringent optical Fibers
    IEEE Journal of Quantum Electronics, 1991
    Co-Authors: P.n. Morgan
    Abstract:

    An analysis into the phase matching condition of four-photon mixing in birefringent optical Fibers is presented. The analysis yields six independent parametric processes. Some of the associated frequency shifts show a dependence on the Fiber birefringence, allowing the authors to obtain constraints under which the parametric Stokes pulse will fall within the Raman gain band to undergo subsequent Raman amplifications. Both polarizations of the pump contribute to the Stokes gain through the stimulated Raman effect. Emphasis is placed on short optical pulses with tradeoffs among frequency shift, pulse walk-off length, and Fiber Attenuation to yield maximum power conversion to the Stokes frequency. Numerical simulation with a highly birefringent germania-doped silica Fiber is used to illustrate the conditions for maximum gain of the Stokes signal.

Alayn Loayssa - One of the best experts on this subject based on the ideXlab platform.

  • Brillouin optical time-domain analysis sensor assisted by Brillouin distributed amplification of pump pulses.
    Optics Express, 2015
    Co-Authors: Javier Urricelqui, Mikel Sagues, Alayn Loayssa
    Abstract:

    We demonstrate the extension of the measurement range of Brillouin optical time-domain analysis (BOTDA) sensors using a distributed Brillouin amplifier (DBA). The technique is based on injecting a DBA pump wave in the Fiber to generate an additional Brillouin interaction that amplifies the BOTDA pump pulses and compensates optical Fiber Attenuation. This amplification does not introduce any significant noise to the BOTDA’s probe wave due to the inherent directionality of the Brillouin gain. Additionally, we deploy a differential pulse-width pair measurement method to avoid measurement errors due to the interplay between the self-phase modulation effect and the changes in the temporal shape of the pulses induced by the transient behavior of Brillouin gain. Experimental proof-of-concept results in a 50-km Fiber link demonstrate full compensation of the Fiber’s Attenuation with no penalty on the signal-to-noise ratio of the detected signal.

  • Dynamic BOTDA measurements based on Brillouin phase-shift and RF demodulation
    Optics Express, 2012
    Co-Authors: Javier Urricelqui, Mikel Sagues, Arantza Zornoza, Alayn Loayssa
    Abstract:

    We demonstrate a novel dynamic BOTDA sensor based, for the first time to our knowledge, on the use of the Brillouin phase-shift in addition to the conventional Brillouin gain. This provides the advantage of measurements that are largely immune to variations in Fiber Attenuation or changes in pump pulse power. Furthermore, the optical detection deployed leads to an enhanced precision or measurement time and to the broadening of the measurement range. Proof-of-concept experiments demonstrate 1.66-kHz measurement rate with 1-m resolution over a 160 m sensing Fiber length. Moreover, a measurement range of 2560 µε with a precision of 20 µε is successfully proved.

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

  • Dynamic stimulated Brillouin scattering analysis
    Journal of Lightwave Technology, 2000
    Co-Authors: A. Djupsjobacka, C. Jacobsen, B. Tromborg
    Abstract:

    We present a new simple analysis-including the effect of spontaneous emission-of the (dynamic) influence of stimulated Brillouin scattering (SBS) on the detected receiver eye diagram. It applies in principle for general types of modulation formats such as the digital formats of amplitude shift keying (ASK), frequency shift keying (FSK), and phase shift keying (PSK). The analysis is formulated for a determination of the signal power depiction and intersymbol interference (ISI) caused by the combined effect of Fiber dispersion, Fiber Attenuation and nonlinear Fiber effects such as the effect of self-phase modulation (SPM) and SBS. The analysis allows a quantification of the dithering influence on the SBS threshold. Representative numerical examples are presented for two single-channel ON-OFF modulated 10-Gh/s systems utilizing Franz-Keldysh and Mach-Zehnder-type modulators.

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

  • single mode optical Fiber for high power low loss uv transmission
    Optics Express, 2014
    Co-Authors: Yves Colombe, D H Slichter, A C Wilson, D Leibfried, D J Wineland
    Abstract:

    We report large-mode-area solid-core photonic crystal Fibers made from fused silica that resist ultraviolet (UV) solarization even at relatively high optical powers. Using a process of hydrogen loading and UV irradiation of the Fibers, we demonstrate stable single-mode transmission over hundreds of hours for Fiber output powers of 10 mW at 280 nm and 125 mW at 313 nm (limited only by the available laser power). Fiber Attenuation ranges from 0.9 dB/m to 0.13 dB/m at these wavelengths, and is unaffected by bending for radii above 50 mm.