Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 26, Issue 17-20, Pages 3048-3055Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2008.925046
Keywords
Coherent optical systems; homodyne detection; phase-locked loops; phase measurement; phase noise
Funding
- BONE-project (Building the Future Optical Network in Europe)
- European Commission
- Italian Ministry of University and Research (MIUR)
- STORiCo Project PRIN 2005
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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.
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