Photonic electric-field sensor utilizing an asymmetric Ti:LiNbO _3 mach-zehnder interferometer with a dipole antenna

摘要

The use of an asymmetric Ti:LiNbO_3 Mach-Zehnder interferometer with a dipole antenna to measure an electric-field strength is described in this article. The device has a small size of 46 7 1 mm and operates at a wavelength of 1.3 m. The AC output characteristics show the modulation depth of ～75% at Vπ voltage of ～5.3 V. The minimum detectable electric fields are ～0.28 V/m and ～0.646 V/m, corresponding to a dynamic range of about ～32 dB and ～26 dB at frequencies 20 MHz and 50 MHz, respectively. The sensors exhibit an almost linear response for the applied electric-field intensity from 0.298 V/m to 29.84 V/m.