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PZT光纤相位调制器调制特性研究
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Abstract:
锆钛酸铅压电陶瓷(PZT, Lead Zirconate Titanate Piezoelectric Ceramics)在极化后具有良好的压电性能，由PZT压电陶瓷和缠绕在PZT上的光纤组成的相位调制器可以通过逆压电效应实现相位调制。相较于常用的铌酸锂(LiNbO3)相位调制器，PZT具有成本低、接入系统损耗小等优点，本文对PZT相位调制器的调制原理进行了理论分析，推导得到了PZT驱动电压和相位改变量、调制深度之间的关系，并基于开环光纤电流传感器(FOCS)搭建了试验样机，试验验证了PZT相位调制器良好的调制性能和温度稳定性，对PZT的灵敏度提升、优化设计和应用提供了理论指导。
PZT (Lead Zirconate Titanate Piezoelectric Ceramics) has good piezoelectric properties after polari-zation. A phase modulator composed of PZT piezoelectric ceramics and optical fibers wound on PZT can achieve phase modulation through the Inverse Piezoelectric Effect. Compared with the com-monly used lithium niobate (LiNbO3) phase modulator, PZT has the advantages of low cost and low access system loss. A theoretical analysis of the modulation principle of the PZT phase modulator is carried out, and the relationship between the PZT drive voltage and the amount of phase change and modulation depth is derived. A test prototype was built based on the open-loop fiber optic cur-rent sensor (FOCS), which verified the excellent modulation performance and temperature stability of the PZT phase modulator and provided theoretical guidance for the sensitivity improvement, op-timization design, and application of the PZT.
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