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A low-biased Mach-Zehnder modulator, optical amplification, and a high-power photodetector are employed to achieve all-photonic link gain as high as 44 dB over a transmission length of 40 km. The link has a 3 dB bandwidth of 6.25 GHz and a 20 dB noise figure.
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Urick et al. (2006) studied this question.
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