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A novel technique to implement a multitap microwave photonic filter with positive and negative coefficients based on the inherent birefringence in a <formula formulatype="inline"><tex Notation="TeX">$\hbox{LiNbO}_{3}$</tex></formula> 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&#x2013;IM) conversion. Thanks to the inherent birefringence in the <formula formulatype="inline"><tex Notation="TeX">$\hbox{LiNbO}_{3}$</tex></formula> crystal, a <formula formulatype="inline"><tex Notation="TeX"> $\pi$</tex></formula> 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.

ieee photonics journal

Multitap Microwave Photonic Filter With Negative Coefficients Based on the Inherent Birefringence in a <formula formulatype="inline"><tex Notation="TeX">$\hbox{LiNbO}_{3}$</tex></formula> Phase Modulator

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