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Proceedings Paper

An improved PGC demodulation method to suppress the impact of laser intensity modulation
Author(s): Huayong Zhang; Min Zhang; Liwei Wang; Yanbiao Liao; D. N. Wang
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Paper Abstract

An improved demodulation method by solving a quadratic equation was proposed for the phase generated carrier (PGC) scheme with frequency modulation to suppress the impact of laser intensity modulation (LIM). The influence of LIM on total harmonic distortion (THD) was analyzed for PGC algorithm considering laser intensity modulation coefficient (LIMC), signal amplitude, initial phase and modulation depth. According to our analysis, the maximum THD of PGC algorithm is more than -24dB when LIMC is 0.1. While the maximum THD is less than -65dB by using the improved method when LIMC is less than 0.5, which is limited by the low-pass filter. For an experiment system with 0.285 LIMC, the THD was -9dB for PGC algorithm. By using the improved method, the THD approached -50dB.

Paper Details

Date Published: 23 November 2011
PDF: 8 pages
Proc. SPIE 8199, 2011 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 81990Q (23 November 2011); doi: 10.1117/12.903706
Show Author Affiliations
Huayong Zhang, Tsinghua Univ. (China)
Min Zhang, Tsinghua Univ. (China)
Liwei Wang, Tsinghua Univ. (China)
Yanbiao Liao, Tsinghua Univ. (China)
D. N. Wang, HongKong Polytechnic Univ. (Hong Kong, China)


Published in SPIE Proceedings Vol. 8199:
2011 International Conference on Optical Instruments and Technology: Optical Sensors and Applications
Brian Culshaw; YanBiao Liao; Anbo Wang; Xiaoyi Bao; Xudong Fan, Editor(s)

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