Enhancement of laser phase noise to intensity noise conversion by fiber nonlinearity and its impact on intensity modulation system performance

Jose A. P. Morgado; Adolfo V. T. Cartaxo

doi:10.1117/12.290394

10 October 1997 Enhancement of laser phase noise to intensity noise conversion by fiber nonlinearity and its impact on intensity modulation system performance

Jose A. P. Morgado, Adolfo V. T. Cartaxo

Author Affiliations +

Proceedings Volume 3230, All-Optical Communication Systems: Architecture, Control, and Network Issues III; (1997) https://doi.org/10.1117/12.290394
Event: Voice, Video, and Data Communications, 1997, Dallas, TX, United States

Abstract

Laser phase noise conversion to intensity noise due to fiber dispersion may impose severe degradation in intensity modulation and direct detection (IM-DD) system performance. In this paper, we investigate theoretically and numerically the influence of fiber nonlinearity on the conversion of phase noise to intensity noise at fiber output. Excellent agreement of noise characteristics between simulations results obtained from an accurate solution of the noise driven laser rate equations and theoretical predictions has been achieved. Results reveal that due to the fiber nonlinearity a significant enhancement of magnitude of the relative intensity noise (RIN) spectrum as well as its broadening is observed in the anomalous dispersion regime while a magnitude reduction and narrowing of the spectrum is observed in the normal regime. The system penalty due to RIN at the fiber output in IM-DD transmission systems using external modulator is assessed. The maximum transmission distance imposed by RIN for 1 dB of power penalty is presented for various optical power at fiber input in gigabit-per-second transmission systems. It is shown that in the anomalous dispersion regime the RIN enhancement due to the fiber nonlinearity can impose a significant impairment in IM-DD transmission systems through the phase modulation to IM conversion enhancement.

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Jose A. P. Morgado and Adolfo V. T. Cartaxo "Enhancement of laser phase noise to intensity noise conversion by fiber nonlinearity and its impact on intensity modulation system performance", Proc. SPIE 3230, All-Optical Communication Systems: Architecture, Control, and Network Issues III, (10 October 1997); https://doi.org/10.1117/12.290394

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