Department of Electronic Engineering, City University of Hong Kong, Hong Kong, China.
Opt Lett. 2010 Mar 1;35(5):769-71. doi: 10.1364/OL.35.000769.
We propose a microwave photonic filter based on circulating a cladding mode in a fiber ring resonator, where the cladding mode is injected into and extracted from the resonator with a pair of matching long-period fiber gratings (LPFGs). The filter has a compact configuration and allows the frequency spacing and the notch depth to be tuned easily. The use of LPFGs also provides the capability of wavelength selection and tuning. Using a standard single-mode fiber and a pair of CO(2) laser-written LPFGs, we demonstrate a filter with a frequency spacing of approximately 1.3 GHz and a notch depth of approximately 17 dB. Our experimental results agree well with theoretical calculations.
我们提出了一种基于在光纤环形谐振器中循环包层模式的微波光子滤波器，其中包层模式通过一对匹配的长周期光纤光栅（LPFG）注入和提取谐振器。该滤波器具有紧凑的结构，允许轻松调谐频率间隔和陷波深度。LPFG 的使用还提供了波长选择和调谐的功能。使用标准单模光纤和一对 CO（2）激光写入的 LPFG，我们演示了具有约 1.3GHz 频率间隔和约 17dB 陷波深度的滤波器。我们的实验结果与理论计算吻合较好。
