Journal
SENSORS
Volume 11, Issue 10, Pages 9233-9241Publisher
MDPI AG
DOI: 10.3390/s111009233
Keywords
coherent optical effects; heterodyne; interferometry; DFB; laser linewidth; faraday rotation; Mach-Zehnder interferometer; Michelson interferometer; Gaussian noise; Lorentzian noise
Funding
- Australian Research Council (ARC) [DP0776092, D0879465]
- Thales Australia Ltd., Underwater Systems Division [LP0776380]
- Australian Research Council [LP0776380] Funding Source: Australian Research Council
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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 w(L) (MZI) = (1.6 +/- 0.2) kHz and w(L) (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.
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