Tunable microwave photonics filter with dual pass-band based on PM-FBG and PS-FBG
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In this paper, a dual pass-band microwave photonics filter with simple, commercial structure is proposed and demonstrated. The key devices are the specially designed polarization maintaining fiber Bragg grating and the phase shift fiber Bragg grating. They are employed to extract out two orthogonally polarized sidebands and remove the undesired sideband, respectively. The simulation results show that without any extra operations or electrical processing, the dual pass-band can be achieved with the two central frequencies of 3.5 GHz and 8 GHz when the frequency spacing between the two orthogonally polarized sidebands is 12 GHz, their 3-dB bandwidth are about 500 MHz. The central frequencies of the two pass-bands can be simply tuned by adjusting the frequency spacing in a range of 4 GHz. In addition, the spurious free dynamic ranges for the two pass-bands are 75.71 dB Hz2/3 and 70.17 dB Hz2/3 respectively. Finally, a brief experiment is also carried out to demonstrate the feasibility.
KeywordsMicrowave photonics filter Polarization maintain fiber Bragg grating Phase shift fiber Bragg grating Spurious free dynamic range
This research was supported by the National Natural Science Foundation of China (No. 61571461), (No. 61231012) and (No. 61401502), Natural Science Foundation of Shaanxi Province (No. 2016JQ6008).