Abstract
In this paper, we characterize the impact of laser phase noise (PN) in direct-detection
optical OFDM (DDO-OFDM) and identify its many differences from those in coherent optical OFDM
(CO-OFDM). The analytical models for the diverse PN effects, including power degradation,
phase rotation term (PRT), and inter-carrier interference (ICI), are given in terms of
critical system parameters with or without the small PN assumption. In particular, the
analytical upper-bound of the ICI power with a simple form is also provided. We also present a
bit error rate (BER) estimation approach which is proven to be reliable for an optical
signal-to-noise-ratio (OSNR) penalty lower than ${\sim} {\hbox {2}}$ dB. In addition, the PN tolerances, in terms of OSNR penalty, are also numerically
analyzed and discussed with different QAM formats, data rates, laser linewdiths, and
subcarrier numbers.
© 2010 IEEE
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