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Sökning: L773:9780819480347

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1.
  • Xu, Tianhua, et al. (författare)
  • Digital compensation of chromatic dispersion in 112-Gbit/s PDM-QPSK system
  • 2009
  • Ingår i: Optical Transmission Systems, Switching, and Subsystems VII. - : SPIE - International Society for Optical Engineering. - 9780819480347 ; , s. 763202-
  • Konferensbidrag (refereegranskat)abstract
    • High bit rates optical communication systems pose the challenge of their tolerance to linear and nonlinear fiber impairments. Coherent optical receivers using digital signal processing techniques can mitigate the fiber impairments in the optical transmission system, including the chromatic dispersion equalization with digital filters. In this paper, an adaptive finite impulse response filter employing normalized least mean square algorithm is developed for compensating the chromatic dispersion in a 112-Gbit/s polarization division multiplexed quadrature phase shift keying coherent communication system, which is established in the VPI simulation platform. The principle of the adaptive normalized least mean square algorithm for signal equalization is analyzed theoretically, and at the meanwhile, the taps number and the tap weights in the adaptive finite impulse response filter for compensating a certain fiber chromatic dispersion are also investigated by numerical simulation. The chromatic dispersion compensation performance of the adaptive filter is analyzed by evaluating the behavior of the bitor-rate versus the optical signal-to-noise ratio, and the compensation results are also compared with other present digital filters.
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2.
  • Zhang, L., et al. (författare)
  • Increasing the delay-bit rate product on silicon chip using Star-16QAM signal with high spectral efficiency
  • 2009
  • Ingår i: Optical Transmission Systems, Switching, and Subsystems VII. - : SPIE. - 9780819480347 ; , s. 763204-
  • Konferensbidrag (refereegranskat)abstract
    • We proposed and experimentally demonstrate the generation of a novel star-16QAM using a dual-parallel Mach-Zehnder modulator (DPMZM) followed by a phase modulator (PM). Coherent detection and off-line processing are used to recover constellation diagrams. We also study optical delay of a novel star-16QAM signal through a silicon microring resonator. Delay time of ∼ 30ps is observed by comparing the eye diagram of the star-16QAM signal on-resonance with that off-resonance.
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