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Suppression of interferometric noise in externally modulated lightwave AM-CATV systems by phase modulation

Suppression of interferometric noise in externally modulated lightwave AM-CATV systems by phase modulation

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Multiple discrete reflections and Rayleigh scattering in a fibre network cause interterometric intensity noise, which degrades the carrier to noise ratio in AM-CATV systems, depending on the laser linewidth and length of the fibre section. This noise can be suppressed by up to 10 dB if single tone phase modulation of the optical signal is applied.

References

    1. 1)
      • Willems, F.W., van der Plaats, J.C.: `Carrier-to-noise ratio degradation due to signal double Rayleigh scattering in EDFAs used in AM-SCM CATV systems for the local loop', Paper MD13, Optical amplifiers and their applications, July 1993, Optical Society of America, , p. 198–201.
    2. 2)
      • Judy, A.F.: `Intensity noise from Rayleigh backscatter and mechanical splices', Paper TuP11, Proc. of European Conf. on Optical Communications, September 1989, Gothenburg, p. 486–489.
    3. 3)
      • A. Yariv , H. Blauvelt , S.-W. Wu . A reduction of interferometric phase-to-intensity conversion noise in fiber links by large index phase modulation of the optical beam. J. Lightwave Technol. , 978 - 981
    4. 4)
      • S. Wu , A. Yariv , H. Blauvelt , N. Kwong . Theoretical and experimental investigation of conversion of phase noise to intensity noise by Rayleigh scattering in optical fibers. Appl. Phys. Lett. , 1156 - 1158
    5. 5)
      • A. Carlson . (1988) , Communications systems.
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