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Sökning: L773:0733 8724 > Radic S.

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1.
  • Alic, N., et al. (författare)
  • Joint Statistics and MLSD in Filtered Incoherent High-Speed Fiber-Optic Communications
  • 2010
  • Ingår i: Journal of Lightwave Technology. - 0733-8724 .- 1558-2213. ; 28:10, s. 1564-1572
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper, signal statistics and their utilization for detection in narrowly filtered equalized high-speed fiber-optic communications are investigated experimentally. Tradeoffs between log-likelihood metric applications and oversampling are covered in detail. It is, for the first time, demonstrated that performance loss in bandwidth-limited systems can be nearly fully recovered (to within 0.5 dB) by taking advantage of band-width-limitation-induced noise correlations and oversampling.
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2.
  • Kylemark, Per, 1976, et al. (författare)
  • Noise in dual-pumped fiber-optical parametric amplifiers: Theory and experiments
  • 2007
  • Ingår i: Journal of Lightwave Technology. - : Institute of Electrical and Electronics Engineers (IEEE). - 0733-8724 .- 1558-2213. ; 25:9, s. 2837-2846
  • Tidskriftsartikel (refereegranskat)abstract
    • The noise figure (NF) of a dual-pumped parametric amplifier with copolarized pumps is quantified for the first time to our knowledge. It is shown that the NF is increased by the noise on the pump sources, in agreement with theory, and that it gives a uniform NF degradation due to a uniform gain spectrum. The magnitude of the NF degradation increases with increasing input-signal power. Various aspects of the NF are studied, such as the effects of three idlers generated by the four-sideband interaction, and Raman-induced losses and excess noise caused by the population of thermal phonons. It is shown that the use of unequal pump powers only affects the low-power NIT to a minimal degree. Also, the gain dependence of the NF is studied, as are the wavelength and signal power dependences of the NE It is shown that at high gain, the NF saturates even when pump noise is an issue. Also, unequal pump powers with fixed gain have a minor impact on the noise performance of the amplifier. Theory and experiments agree well with each other.
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