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A 5 Gbit/s phase diversity homodyne detection experiment has been performed by using a high-speed 1.5 μm distributedfeedback laser diode with frequency-shift-keying modulation, 3×3 optical fibre coupler for a 120° optical hybrid, three matched wideband receivers and wideband squaring circuits for signal demodulation.
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Emura et al. (1989) studied this question.
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