PIS Code: OFT Presentation Preference: Oral PERFORMANCE IMPROVEMENT IN RADIO OVER FIBER (RoF) LINKS BY MINIMIZING NON LINEARITIES IN SOURCES AND AMPLIFIERS
نویسنده
چکیده
In this paper, we discuss the methods to minimize the nonlinearity in optical sources and amplifiers used in RoF systems. The non linearity present in a Laser diode is minimized by pre distorting the drive current, by passing it through a predistortion circuitry to achieve a linear transfer characteristics which in turn suppress the harmonic and inter modulation distortions. A feed forward technique is used to reduce the nonlinear distortion in an Erbium Doped Fiber Amplifier (EDFA) by adding error signal deduced by mixing input and output in anti-phase to the original signal. We evaluate the system performance due to the effect of both pre distortion and feed forward techniques in minimizing the non-linearity in Laser Diode and optical amplifier.
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