Analysis of total harmonic distortion in phase generated carrier demodulation algorithm by digital arctangent approach

摘要：

　　In this paper,total harmonic distortion(THD)of phase generated carrier demodulation algorithm by digital arctangent approach(PGC-DAT algorithm)is analyzed.THD due to the deviations of modulation depth and carrier phase delay is investigated both theoretically and experimentally.The analytical expression of THD as the function of carrier modulation depth,signal amplitude,initial phase and deviations of modulation depth and carrier phase delay has been derived.According to our analysis,the maximum THD for different initial phases exists,which reaches the peak value when the signal amplitude is close to 1.2 rad.The best modulation depth to minimize the maximum THD is 2 rad.Finally,an experimental system is set up with the mean THD below-60 dB.The analytical expression of THD derived in this paper agrees well with the experimental results.

关键词： Fiber-optic interferometer phase generated carrier (PGC) total harmonic distortion (THD) analytical expression

作者: Huayong Zhang Min Zhang

作者单位: National Ocean Technology Center,Tianjin,300112,China State Key Laboratory on Integrated Optoelectronics,Department of Electronic Engineering Tsinghua Uni

会议类型: 国际会议

会议名称: 2013 International Conference on Optical Instrument and Technology (OIT’2013)(2013年光学仪器与技术国际会议)

会议地点: 北京

会议语种:英文

页码: 1-8

在线出版日期: 2013-11-17（万方平台首次上网日期，不代表论文的发表时间）