Abstract
Several techniques for phase noise PSD measurement of continuous wave
(CW) lasers to be used in coherent transmission systems are analyzed. Between
them, we evaluate two novel techniques. The first employs a homodyne optical
phase-locked loop, while the second uses a signal source analyzer. Experimental
results obtained by these two methods are compared with classical linewidth
measurement methods like self-heterodyne and Michelson interferometer. Limits
and accuracy of each method are discussed. Furthermore, the comparison shows
that, for coherent transmission system applications, only a subset of the
analyzed methods is useful for laser phase noise characterization.
© 2008 IEEE
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