一种基于 FPF 的高速可调谐激光器

摘要

In order to solve the problem of Fabry-Perot Filter (FPF)distortion resulted from the insufficient driving capability in high-frequency scanning,this paper designs a push-pull driving circuit with a scanning frequency of 1 kHz for a FPF-based tunable laser.It performs the modeling of the driving circuit by the TINA software,analyzes by simulation the impacts of the capacitive load of piezoelectric ceramics on this circuit and finds the method for its capacitive compensation.By using this meth-od,it removes the hidden trouble of its self-excited oscillation,thus solving the problem of distortion generated when high-fre-quency signals drive a large capacitive reactance load.The test results show that with this driving circuit-based FPF,the high-speed tunable laser has good performance and its wavelength demodulation error is less than ± 10 pm in high frequency of 1 kHz.%为了克服 FPF(法布里-珀罗滤波器)在高频扫描时驱动能力不足易产生失真的问题，设计了一种推挽式的 FPF 驱动电路，扫描频率可达1 kHz。利用 TINA 软件对该驱动电路建模，仿真研究了 PZT (压电陶瓷)容性负载对驱动电路的影响，找出了对其进行容性补偿的方法。使用该方法消除了驱动电路自激振荡的隐患，解决了高频信号驱动大容抗负载时易产生失真的问题。通过测试可知，基于所设计的驱动电路的 FPF 高速可调谐激光器性能优良，在1 kHz 高频工作条件下，其波长解调误差小于±10 pm。