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A high-sensitivity optical receiver has been designed for a bit rate of 8 Gbit/s and wavelengths of1.3-1.55. The receiver uses a 60-GHz gain-bandwidth-product InGaAs/InGaAsP/InP avalanche photodiode followed by a high-impedance hybrid GaAs MESFET preamplifier. A bandwidth of 6.9 GHz was measured, with flat frequency response ±2 dB being obtained through the use of a 3-tap transversal equalizer. A sensitivityP̄as high as -25.8 dBm was measured for 10-9bit-error rate.
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Kasper et al. (1987) studied this question.
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