Chang Zhongcan, Luo Zhixiang, Cao Shiyi, Ouyang Kui, Ge Keting, Wan Zhujun
Opt Express. 2022 Apr 11;30(8):13864-13874. doi: 10.1364/OE.456069.
Narrow-band tunable optical filters (TOF) based on three cascaded Fabry-Perot (FP) cavities are demonstrated. The FP cavities are fabricated with Pb(MgNb)O-PbTiO (PMN-PT), which is a transparent electro-optic ceramic. With a reflective design, the optical signal passes the three FP cavities twice. Thus we can design the FP cavities with a relatively low reflectivity, which enables it more tolerant to the loss in the cavities. Two types of TOF samples are fabricated. The specifications of the transmissive type TOF with dual-ports are tuning range >48nm, FWHM (full width half maximum) <0.06nm, insertion loss <3.87dB, crosstalk <-39dB, which meet the requirements by optical performance monitor (OPM) applications. The specifications of the reflective type TOF with single-port are tuning range >48nm, FWHM (full width half maximum) <0.1nm, insertion loss <2.82dB, crosstalk <-30dB, which can be employed in tunable fiber lasers for wavelength selection and tuning.
展示了基于三个级联法布里 - 珀罗（FP）腔的窄带可调谐光学滤波器（TOF）。FP腔由透明电光陶瓷铌镁酸铅 - 钛酸铅（PMN - PT）制成。采用反射式设计，光信号两次通过三个FP腔。因此，我们可以设计具有相对较低反射率的FP腔，这使其对腔内损耗更具耐受性。制作了两种类型的TOF样品。双端口透射型TOF的规格为调谐范围>48nm，半高宽（FWHM）<0.06nm，插入损耗<3.87dB，串扰<-39dB，满足光学性能监测器（OPM）应用的要求。单端口反射型TOF的规格为调谐范围>48nm，半高宽（FWHM）<0.1nm，插入损耗<2.82dB，串扰<-30dB，可用于可调谐光纤激光器的波长选择和调谐。
