The effect of local oscillator intensity noise on the performance of two and three-branch ASK homodyne receivers and single-branch ASK heterodyne receivers is investigated and an optimum local oscillator power is found. At optimum local oscillator power, both the three-branch and heterodyne receivers are found to have a somewhat better sensitivity than the two-branch receiver. If the local oscillator power is higher than the optimum value, the three-branch receiver is significantly less sensitive to intensity noise than the other two receivers.
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Elrefaie et al. (1988) studied this question.
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