The performance of continue phase shift keying (CPFSK) optical communication system is investigated. The receiver recovers the phase of the optical signal by using a phase diversity technique. The system with delay-and-multiply frequency discriminator is examined. Exact mean and variance of output statistic are derived without assumption of small delay time in the delay-and-multiply discriminator. The results of Gaussian approximation are applied to finding the system bit error rate floors and the optimum delay times. It is found that for different linewidth the delay time should be set differently. The influences of laser linewidth, noise correlation, and filter bandwidth are taken into account. Results of computer simulation illustrate the non-Gaussian character of the probability density function of the receiver output current.
The performance of an optical CPFSK receiver can be improved by choosing adequate shape of Gaussian frequency pulse and the delay time of the delayand-multiply frequency discriminator. Exact mean and variance of the output statistic are derived. The results of Gaussian approximation are applied to finding the system bit error rate floors and the optimum delay times. For various Gaussian frequency pulse shapes, the delay times should be set accordingly. The effects of laser linewidth and shot noise are taken into account.
Numerical method for efficiently computing the performance of continuous phase frequency shift keying (CPFSK) is presented. The receiver uses a phase diversity technique with a delay-and-multiply frequency discriminator to recover the phase of the optical signal. The moment generating function (MGF) of the discriminator is derived and used in the calculation of bit error rate (BER). The results of numerical integration show that the receiver output is far from Gaussian. Exact mean and variance are derived for the Gaussian approximation (GA). The effects of laser linewidth, filter bandwidth, and shot noise correlation are all considered.
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