An improved PGC demodulation method to extend dynamic range and compensate low-frequency drift of modulation depth

Lu Hou; Feng Peng; Jun Yang; Yonggui Yuan; Dekai Yan; Bing Wu; Libo Yuan

doi:10.1117/12.2195867

28 September 2015 An improved PGC demodulation method to extend dynamic range and compensate low-frequency drift of modulation depth

Lu Hou, Feng Peng, Jun Yang, Yonggui Yuan, Dekai Yan, Bing Wu, Libo Yuan

Author Affiliations +

Proceedings Volume 9634, 24th International Conference on Optical Fibre Sensors; 96345Y (2015) https://doi.org/10.1117/12.2195867
Event: International Conference on Optical Fibre Sensors (OFS24), 2015, Curitiba, Brazil

Abstract

In this paper, we propose an improved method of phase generated carrier (PGC) combined with 3×3 coupler to extend dynamic range and compensate low-frequency drift of modulation depth. The small amplitude signal(≤10^-2 rad) is figured out by the PGC method to keep the minimum phase resolution and the large amplitude signal(≥10rad) can be calculated by the 3×3 fixed phase difference algorithm to extend the maximum amplitude of the dynamic range. We can get the same result to the signal with the normal amplitude(10^-2 rad≤D≤10rad) by any two kinds of methods. Furthermore, the modulation carrier wave amplitude and frequency information can be monitored by the 3×3 auxiliary algorithm to compensate low-frequency drift of modulation depth and keep the system stability as a feedback. According to the result, the interferometer is able to resolve 2.0 ×10^-5rad/√Hz with a dynamic range of 182.2dB@10Hz frequency and 2Mbps sample rates.

Citation Download Citation

Lu Hou, Feng Peng, Jun Yang, Yonggui Yuan, Dekai Yan, Bing Wu, and Libo Yuan "An improved PGC demodulation method to extend dynamic range and compensate low-frequency drift of modulation depth", Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 96345Y (28 September 2015); https://doi.org/10.1117/12.2195867

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