10 Gbit/s optical PSK homodyne transmission experiments using a modified decision-driven optical phase locked loop with 1.55 μm external cavity laser diodes were conducted. A receiver sensitivity of −34.2 dBm or 297 photon/bit was experimentally achieved. There was no degradation in receiver sensitivity after signal transmission through 151 km of dispersion shifted fibre.
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Norimatsu et al. (1990) studied this question.
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