Dynamic range of analog fiber optic links used in microcellular mobile radio applications
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The dynamic range is limited by the noise and the nonlinear distortion introduced by the fiber link. The main sources of nonlinear distortion are threshold clipping, gain saturation of the laser, and the combination of laser chirp and fiber dispersion. We have analytically modeled these nonlinearities and used these models to understand the dependence of the nonlinear distortion on the physical parameters of the laser diode and the fiber and also on the modulation index per channel and the number of channels. The performance of the 1S- 19 AMPS signals and the IS-54IDMA signals in the presence of fiber link noise is also discussed. Finally, the dynamic range of the fiber link for both AMPS and IDMA signals has been analyzed. The dynamic range of the fiber link is limited by the threshold clipping nonlinearity. It is also highly dependent on the number of mobile signals that are being communicated over the fiber link.
- Masters Theses