Noncoherent detection of coherent optical heterodyne signals corrupted by laser phase noise
Varnum, Kent C. M.
Robertson, R. Clark
Ha, Tri T.
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An error probability analysis is performed for noncoherent detection of optical heterodyne signals corrupted by laser phase noise and additive white Gaussian noise. Two types of laser modulation are investigated, on-off keying (00K) and frequency shift keying (FSK). Single user 00K system performance for different linewidth-to-bit rate ratios is analyzed over a range of both signal-to-noise ratios (SNR) and normalized decision thresholds. The decision threshold analysis illustrates which noise source dominates system performance. An analytical expression representing the effect of laser phase noise on system performance is derived based on a high user bit rate assumption. The system performance obtained with the high bit rate expression is compared with the system performance obtained with currently used expressions to determine its range of validity. An error probability analysis is then performed for noncoherent detection of FSK signals corrupted by laser phase noise and additive white Gaussian receiver noise. The performance of the FSK system is compared with the performance of the 00K system. It is shown that optical FSK systems perform better than optical 00K systems. As a demonstration of future system capability, the performance of a multiuser FSK code-division multiple access (FSK-CDMA) system is analyzed. The results obtained indicate that the application of FSK-CDMA techniques to current wavelength division multiplexed (WDM) systems can increase user capacity up to one thousand fold.
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