A photonic microwave quadrature filter is presented. It has a very simple structure, very low phase imbalance, and high signal-to-noise ratio performance. Experimental results are presented that demonstrate a photonic microwave quadrature filter with a 3 dB operating frequency range of 10.5 26.5 GHz, an amplitude and phase imbalance of less than ±0.3 dB and ±0.15°, and a signal-to-noise ratio of more than 121 dB in a 1 Hz noise bandwidth. © 2015 Optical Society of America.
Cao, Y., Chan, E., Wang, X., Feng, X., & Guan, B. (2015). Photonic microwave quadrature filter with low phase imbalance and high signal-to-noise ratio performance. Optics Letters, 40(20), 4663-4666. https://doi.org/10.1364/OL.40.004663