Fig. 3: Bidirectional conversion.
From: Electrically interfaced Brillouin-active waveguide for microwave photonic measurements
a Experimental setup for characterizing the optical-to-microwave conversion using a dual-drive configuration. LNA: low noise amplifier. b The quantum efficiency of optical-to-microwave conversion characterized at an optical pump power of 16.12 dBm (blue) and microwave-to-optical conversion characterized at an optical pump power of 16.32 dBm (red), with the peak transduction corresponding to mode A. c The peak of the optical-to-microwave conversion spectra at three different optical powers (left), along with an optical pump power sweep for both the optical-to-microwave (blue) and microwave-to-optical (red) conversions (right). The linear fitting (black) suggests a decent value of Brillouin gain GB. The dashed line shows the optical pump power used in (b).
