A multi-passband microwave photonic filter for sensing applications

2018 4th International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Liang, Lei^1 ; Li, Sishi^1^2 ; Wo, Jianghai^2 ; Xia, Liangliang^3

National Engineering Laboratory of Fiber Sensing Technology, Wuhan University of Technology, Wuhan

430070, China^1

Air Force Early Warning Academy, Wuhan

430019, China^2

Wuhan University of Technology, Advanced Engineering Technology Research Institute, Zhongshan City

528437, China^3

关键词: Fiber sensing;    Free spectral range;    Frequency variation;    Microwave photonic filter (MPF);    Microwave photonic filters;    Pass bands;    Sensing applications;    Variable optical delay lines;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/252/2/022007/pdf
DOI  :  10.1088/1755-1315/252/2/022007

来源: IOP

【 摘 要 】

In this paper, a multi-passband microwave photonic filter (MPF) for sensing applications has been proposed and experimentally demonstrated. The principle is based on a microwave photonic finite impulse response (FIR) filter. Multi passband can be achieved simply by cascading two Mach-Zehnder interferometers (MZIs) with different arm length difference. The variation of the length difference of MZI will change the free spectral range (FSR) of the optical spectrum, and resulting in the frequency variation of the passbands. Thus, by changing the arm length of the MZI using variable optical delay line (VODL), a high length measuring sensitivity of -2.796 GHz/mm has been achieved. Since different passbands have different measuring sensitivity, the MPF reveals the advantages of highly sensitive, and has broad application prospects in the field of optical sensing, especially multi-parameter sensing.