13 February 1990 Noise Aliasing In Interferometric Sensors Utilizing Phase-Generated Carrier Demodulation
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Abstract
We show that high frequency phase-noise is frequency translated to the baseband in interferometric sensors using phase-generated carrier (PGC) demodulation. Under normal circumstances, this excess noise does not contribute significantly to the true low frequency phase-noise arising due to 1/f laser frequency jitter. However, when a phase noise stabilized laser is used, degradation in phase sensitivity of an interferometer can occur using PGC demodulation when compared with direct homodyne detection. The origins and nature of this noise are discussed, and experimental verification of the effect presented.
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T. A. Berkoff, A. D. Kersey, A. Dandridge, "Noise Aliasing In Interferometric Sensors Utilizing Phase-Generated Carrier Demodulation", Proc. SPIE 1169, Fiber Optic and Laser Sensors VII, (13 February 1990); doi: 10.1117/12.963020; https://doi.org/10.1117/12.963020
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