Multitap Microwave Photonic Filter With Negative Coefficients Based on the Inherent Birefringence in a $\hbox{LiNbO}_{3}$ Phase Modulator

IEEE Photonics Journal

Muguang Wang¹  Jianping Yao² 

[1] $^{1}$ Institute of Lightwave Technology, Key Lab of All Optical Network and Advanced Telecommunication Network of EMC , Beijing Jiaotong University, Beijing, China;Microwave Photonics Research Laboratory, School of Electrical Engineering and Computer Science, University of Ottawa, Ottawa, Canada;

关键词: Microwave photonics;    microwave photonic filter;    birefringence;    phase modulator;    polarization interference;   

DOI  :  10.1109/JPHOT.2013.2265981

来源: DOAJ

【 摘 要 】

A novel technique to implement a multitap microwave photonic filter with positive and negative coefficients based on the inherent birefringence in a $\hbox{LiNbO}_{3}$ phase modulator is proposed and demonstrated. In the proposed filter, a microwave signal is applied to the phase modulator and an optical polarizer is connected at the output of the phase modulator to perform polarization interference and phase-modulation to intensity-modulation (PM–IM) conversion. Thanks to the inherent birefringence in the $\hbox{LiNbO}_{3}$ crystal, a $\pi$ phase shift is obtained by adjusting the wavelength spacing between two adjacent wavelengths, which leads to the generation of a positive coefficient and a negative coefficient. An equivalent experiment is performed. Four-tap and six-tap microwave photonic filters with positive and negative coefficients are experimentally demonstrated. The reconfigurability of the four-tap and six-tap microwave photonic filters is also investigated.

【 授权许可】

Unknown