Abstract
The sensitivity penalty of a direct detection 10 Gbit/s optical CPFSK receiver due to laser phase noise, interferometric intensity noise and chromatic dispersion is determined analytically at a BER of 10 -9 . The analysis is based on linear approximation of the output phase of a linearly filtered CPFSK signal. The significant contributory role of the laser phase noise with increasing value of chromatic dispersion index is highlighted. The theoretical results have been found to be in excellent agreement with the simulation results.
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