Abstract
A closed-form expression for differential phase-error variance is derived
for the phase noise averaged over a finite time window. Using this
expression, a method of laser linewidth characterization and in-service
monitoring is proposed in presence of additive white noise applicable to
both single-carrier and multi-carrier systems. The method is further
substantiated by experiments of 107-Gb/s coherent optical OFDM transmission
over 960-km SSMF fiber. Additionally, a novel technique of digitally tuning
laser linewidth is proposed and demonstrated which may be useful to
systematically study the laser phase noise impact.
© 2011 IEEE
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