Ultrawideband optical cancellation of RF interference with phase change

This work proposes a novel approach to perform optical cancellation of RF interference with any constant phase change, based on polarization-modulator-based microwave photonic phase shifters. Preliminary results validate the proposed scheme and achieve a 30-dB cancellation depth over 9.5 GHz. The frequency independent microwave photonic phase shifters also allow for wide frequency range tunability towards 30 GHz, and recovery of a signal from a wideband interferer. The experimental results are limited by the imperfection of the electrical components. The proposed cancellation scheme might not only be applicable for WLANs based on standards such as IEEE 802.11ad and 802.11aj, but also provide a straight forward solution to the multipath effect. (C) 2017 Optical Society of America