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A PGC-DCDM demodulation scheme insensitive to phase modulation depth and carrier phase delay in an EOM-based SPM interferometer
Optics Communications ( IF 2.4 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.optcom.2020.126183
Shihua Zhang , Yuanpeng Chen , Benyong Chen , Liping Yan , Jiandong Xie , Yingtian Lou

Abstract Phase modulation depth (C) and carrier phase delay ( θ ) are two critical factors for the phase generated carrier (PGC) demodulation scheme. Traditional PGC demodulation schemes require θ be m π ( m = 0 , ± 1, …) and C be specified values, otherwise, the demodulated signal will be distorted. In this paper, a PGC-DCDM demodulation scheme insensitive to C and θ is proposed. By performing the differential-cross-dividing-and-multiplying (DCDM) operation on the quadrature components in PGC demodulation, the influences of C and θ are eliminated simultaneously, and the linear and nonlinear distortions in traditional PGC schemes can be suppressed effectively. As expected by the theoretical analysis, simulation and experimental results have confirmed that the PGC-DCDM scheme is insensitive to C and θ and has low distortion and large dynamic range. Experimental results showed that, as C varies from 1.5 rad to 3.5 rad or θ changes from -180°to 180°, the amplitude of the demodulated signal maintains at the true value, and a stable low THD below 0.6% as well as a high SINAD greater than 44 dB were achieved by PGC-DCDM scheme.

中文翻译:

基于 EOM 的 SPM 干涉仪中对相位调制深度和载波相位延迟不敏感的 PGC-DCDM 解调方案

摘要 相位调制深度(C)和载波相位延迟(θ)是相位生成载波(PGC)解调方案的两个关键因素。传统的 PGC 解调方案要求 θ 为 m π ( m = 0 , ± 1, …) 且 C 为指定值,否则解调信号会失真。本文提出了一种对C和θ不敏感的PGC-DCDM解调方案。通过对PGC解调中的正交分量进行DCDM运算,同时消除C和θ的影响,有效抑制传统PGC方案中的线性和非线性失真。正如理论分析、仿真和实验结果所预期的那样,PGC-DCDM方案对C和θ不敏感,失真小,动态范围大。
更新日期:2020-11-01
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