Instability mechanism of intensity-noise-induced phase noise in PGC detection system and suppression thereof

Qiong Yao; Fuyin Wang; Shuidong Xiong; Qingkai Hou

doi:10.1117/12.2575201

10 October 2020 Instability mechanism of intensity-noise-induced phase noise in PGC detection system and suppression thereof

Qiong Yao, Fuyin Wang, Shuidong Xiong, Qingkai Hou

Author Affiliations +

Proceedings Volume 11554, Advanced Sensor Systems and Applications X; 115541L (2020) https://doi.org/10.1117/12.2575201
Event: SPIE/COS Photonics Asia, 2020, Online Only

Conference Poster

Abstract

The phase noise induced by the intensity noise fluctuates in some sensing systems, which could affect the assessment of system performance. In this paper, the phase noise induced by the intensity noise in the phase generated carrier (PGC) detection system is modeled. It manifests that the phase noise level has a trigonometric relation with the initial phase of the interference fringes, namely workpoint-related fluctuation. Besides, the shape of the fluctuation to the workpoint is also a function of the modulation depth. As a result, the measurement for phase noise should iterate over many workpoint sets at a special modulation depth. Whereas the workpoint iteration is not always actually viable, a modified PGC detection scheme that combined the 3×3 coupler multi-phase method is proposed. To average out the three demodulated outputs, the phase noise is theoretically independent of the workpoint, which is also smaller than the traditional value. The tested results show good accordance with the theory. The theoretical model and method in this paper can be used as a guidance of the noise assessment in large-scale multiplexed sensing networks.

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Qiong Yao, Fuyin Wang, Shuidong Xiong, and Qingkai Hou "Instability mechanism of intensity-noise-induced phase noise in PGC detection system and suppression thereof", Proc. SPIE 11554, Advanced Sensor Systems and Applications X, 115541L (10 October 2020); https://doi.org/10.1117/12.2575201

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