Second-order distortion and electronic compensation in analog links containing fiber amplifiers

A detailed, wide-frequency-range analysis of the second-order distortions in optically amplified subcarrier-multiplexed lightwave video transport systems is presented. It is found that the three major system distortions are from the DFB laser's intrinsic dynamic nonlinearity, the fiber amplifier's nonuniform gain profile, and the fiber's chromatic dispersion. A generic electronic circuit is proposed to compensate the distortions from all three mechanisms simultaneously. A low-distortion, amplified, 1.55- mu m system in which the fiber amplifier and dispersive distortions are suppressed using the proposed circuitry is discussed.<
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