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The performance of long-haul high speed coherent optical fiber communicationsystems is significantly degraded by the laser phase noise and the equalizationenhanced phase noise (EEPN). In this paper, the analysis of the one-tapnormalized least-mean-square (LMS) carrier phase recovery (CPR) is carried outand the close-form expression is investigated for quadrature phase shift keying(QPSK) coherent optical fiber communication systems, in compensating both laserphase noise and equalization enhanced phase noise. Numerical simulations havealso been implemented to verify the theoretical analysis. It is found that theone-tap normalized least-mean-square algorithm gives the same analyticalexpression for predicting CPR bit-error-rate (BER) floors as the traditionaldifferential carrier phase recovery, when both the laser phase noise and theequalization enhanced phase noise are taken into account.

Close-Form Expression of One-Tap Normalized LMS Carrier Phase Recovery in Optical Communication Systems