Journal
OPTICS EXPRESS
Volume 23, Issue 5, Pages 6803-6808Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.006803
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Funding
- National Natural Science Foundation of China [61177073]
- Major Applied Basic Research Project in the Research Program of National University of Defense Technology [ZDYYJCYJ20140701]
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We study the method of Voigt profile fitting for ultra-narrow linewidth measurement. It filters out the effect of the spectrum broadening due to the 1/f frequency noise and extracts out the Lorentzian lineshape from the measured spectrum. The resolution is thus greatly promoted than the direct measurement from the self-heterodyne technique. We apply this method to an ultra-narrow-linewidth (similar to 40 Hz by heterodyne beat technique) Brillouin/erbium fiber laser. The linewidth estimated from Voigt fitting method is indicated to be more accurate. In contrast, the linewidths estimated direct from the 3-dB and the 20-dB heterodyne-spectrum width are far over the true linewidth of the BEFL. The Voigt fitting method provides an efficient tool for ultra-narrow-linewidth measurement. And compared with heterodyne beat technique, it is applicable for all types of lasers. (C) 2015 Optical Society of America
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