En-ming Xu,Qi Wang,Fei Wang,Pei-li Li.Instantaneous microwave frequency measurement based on hybrid microwave photonic filter[J].Optoelectronics Letters,2014,10(5):374-377 Instantaneous microwave frequency measurement based on hybrid microwave photonic filter Author Name Affiliation E-mail En-ming Xu  School of Optoelectronic Engineering, Nanjing University of Posts and Telecommunications, Nanjing, 210046, China  enmingxu@njupt.edu.cn  Qi Wang  School of Optoelectronic Engineering, Nanjing University of Posts and Telecommunications, Nanjing, 210046, China    Fei Wang  School of Optoelectronic Information, Chongqing University of Technology, Chongqing, 400054, China    Pei-li Li  School of Optoelectronic Engineering, Nanjing University of Posts and Telecommunications, Nanjing, 210046, China    Abstract:       A novel photonic technique for instantaneous microwave frequency measurement based on hybrid microwave photonic filter (HMPF) is proposed and experimentally demonstrated. The HMPF is composed of an all-pass filter and a band-pass filter with negative coefficients. By properly controlling the power relationship between the all-pass filter and the band-pass filter, the HMPF can realize a monotonic frequency response, and then a unique relationship between the output power and the input frequency is established. A high measurement resolution can be achieved for a given frequency range. Hits: 4032 Download times: 0 This work has been supported by the National Natural Science Foundation of China （Nos.61302026, 61275067 and 61007064）, the Jiangsu Natural Science Foundation （Nos.BK2012432 and BK2012830）, the PhD Programs Foundation of the Ministry of Education of China （No.20123223120005）, the Nattwal Science Foundation of the Jiangsu Higher Education Institutions （No.13KJB510025）, and the Key Project of the Natural Science Foundation Project of Chongqing （No.cstc2013jjB20004）. View Full Text    Download reader