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Microwave photonic notch filter with complex coefficient based on four wave mixing |
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| Authors: | XU Dong CAO Ye TONG Zheng-rong and YANG Jing-peng |
| Affiliation: | Communication Devices and Technology Engineering Research Center, School of Computer and Communication Engineering, Tianjin University of Technology, Tianjin 300384, China;School of Electronic and Information Engineering, Qingdao University, Qingdao 266071, China;Communication Devices and Technology Engineering Research Center, School of Computer and Communication Engineering, Tianjin University of Technology, Tianjin 300384, China;Communication Devices and Technology Engineering Research Center, School of Computer and Communication Engineering, Tianjin University of Technology, Tianjin 300384, China |
| Abstract: | A microwave photonic notch filter with a complex coefficient is proposed and demonstrated based on four wave mixing (FWM). FWM effect of two single-frequency laser beams occurs in a highly nonlinear fiber (HNLF), and multi-wavelength optical signals are generated and used to generate the multi-tap of microwave photonic filter (MPF). The complex coefficient is generated by using a Fourier-domain optical processor (FD-OP) to control the amplitude and phase of the optical carrier and phase modulation sidebands. The results show that this filter can be changed from bandpass filter to notch filter by controlling the FD-OP. The center frequency of the notch filter can be continuously tuned from 5.853 GHz to 29.311 GHz with free spectral range (FSR) of 11.729 GHz. The shape of the frequency response keeps unchanged when the phase is tuned. |
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