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The authors investigate the optimum values for both the local oscillator (LO) modulation index and the Mach-Zehnder electrooptic bias point to maximize the dynamic range of optically amplified harmonic downconverting fiber-optic links. The results show that the maximum dynamic range is achieved when downconverting through the second harmonic of the LO driving signal.
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Fuster et al. (1999) studied this question.
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