High rejection photonic RF filter using a thulium doped crystal

In this paper we demonstrate a photonic RF filter using the SHB properties in a Tm
³
+:YAG crystal. We present an experimental study aiming to optimize the rejection and steepness of the SHB filter. At the term of this study we show a rejection of 60 dB and a rejection of 45 dB at 50 MHz from the edge of the filter, 20 dB higher than most photonic RF filters and compliant with stringent applications.