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A nonrepeated fibre transmission experiment over 308 km of conventional optical fibre is reported at 2.5 Gbit/s in a CPFSK heterodyne detection system. The system has a sensitivity of −46.7 dBm or 67 photons/bit at 10−9 BER and has the maximum allowable attenuation of 55.1 dB without an optical amplifier.
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Imai et al. (1990) studied this question.
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