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Sensors 2011, 11(10), 9233-9241; doi:10.3390/s111009233
Article

A Comparison of Delayed Self-Heterodyne Interference Measurement of Laser Linewidth Using Mach-Zehnder and Michelson Interferometers

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Received: 17 August 2011; in revised form: 13 September 2011 / Accepted: 23 September 2011 / Published: 27 September 2011
(This article belongs to the Special Issue Optical Fiber Sensors)
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Abstract: Linewidth measurements of a distributed feedback (DFB) fibre laser are made using delayed self heterodyne interferometry (DHSI) with both Mach-Zehnder and Michelson interferometer configurations. Voigt fitting is used to extract and compare the Lorentzian and Gaussian linewidths and associated sources of noise. The respective measurements are wL (MZI) = (1.6 ± 0.2) kHz and wL (MI) = (1.4 ± 0.1) kHz. The Michelson with Faraday rotator mirrors gives a slightly narrower linewidth with significantly reduced error. This is explained by the unscrambling of polarisation drift using the Faraday rotator mirrors, confirmed by comparing with non-rotating standard gold coated fibre end mirrors.
Keywords: coherent optical effects; heterodyne; interferometry; DFB; laser linewidth; faraday rotation; Mach-Zehnder interferometer; Michelson interferometer; Gaussian noise; Lorentzian noise coherent optical effects; heterodyne; interferometry; DFB; laser linewidth; faraday rotation; Mach-Zehnder interferometer; Michelson interferometer; Gaussian noise; Lorentzian noise
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Canagasabey, A.; Michie, A.; Canning, J.; Holdsworth, J.; Fleming, S.; Wang, H.-C.; Åslund, M.L. A Comparison of Delayed Self-Heterodyne Interference Measurement of Laser Linewidth Using Mach-Zehnder and Michelson Interferometers. Sensors 2011, 11, 9233-9241.

AMA Style

Canagasabey A, Michie A, Canning J, Holdsworth J, Fleming S, Wang H-C, Åslund ML. A Comparison of Delayed Self-Heterodyne Interference Measurement of Laser Linewidth Using Mach-Zehnder and Michelson Interferometers. Sensors. 2011; 11(10):9233-9241.

Chicago/Turabian Style

Canagasabey, Albert; Michie, Andrew; Canning, John; Holdsworth, John; Fleming, Simon; Wang, Hsiao-Chuan; Åslund, Mattias L. 2011. "A Comparison of Delayed Self-Heterodyne Interference Measurement of Laser Linewidth Using Mach-Zehnder and Michelson Interferometers." Sensors 11, no. 10: 9233-9241.


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