Gain and noise ripple reduction in broadband Raman amplifiers using HNLF spectral broadening

V. Kalavally, R. Karuntu, T. Win, M. Premaratne

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    Abstract

    The effects of using spectrally broadened pumps on the gain and noise ripple in broadband Raman amplifiers are investigated. Pump spectral broadening, achieved by initiating modulation instability in a highly nonlinear fiber (HNLF) using a continuous-wave input is shown to reduce the number of pumps required in addition to improving the flatness of the gain and noise profile. Optimal broadening of a pump spectrum in the E-and S-bands is achieved as a result of optimisation of the second order disperion and nonlinear coefficients of the HNLF. For a specific example of a 51-channel, C-band wavelength-division- multiplexed network employing a 50-km transmission fiber span, it is shown using simulation that spectrally broadened pumps improve the gain and noise ripple by 2 dB and 0.2 dB respectively. It is also shown that the number of pumps can be reduced by half when such a pumping scheme is used.

    Original languageEnglish
    Title of host publicationICCAIE 2010 - 2010 International Conference on Computer Applications and Industrial Electronics
    Pages49-53
    Number of pages5
    DOIs
    Publication statusPublished - 2010
    EventInternational Conference on Computer Applications and Industrial Electronics, ICCAIE 2010 - Kuala Lumpur, Malaysia
    Duration: 5 Dec 20107 Dec 2010

    Conference

    ConferenceInternational Conference on Computer Applications and Industrial Electronics, ICCAIE 2010
    CountryMalaysia
    CityKuala Lumpur
    Period5/12/107/12/10

    Keywords

    • Gain ripple
    • HNLF
    • Modulation instability
    • Noise ripple
    • Nonlinear spectral broadening
    • Raman amplifier

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