Title :
Integrated optical E-field probes with segmented modulator electrodes
Author :
Meier, Thomas ; Kostrzewa, Carsten ; Petermann, Klaus ; Schüppert, Bernd
Author_Institution :
Inst. fur Hochfrequenztech., Tech. Univ. Berlin, Germany
fDate :
8/1/1994 12:00:00 AM
Abstract :
Integrated optical E-field sensors using a Ti:LiNbO3 Mach-Zehnder interferometer with a combined antenna and modulator electrode structure yielding a small size (12×3×2 mm3 or 30×3×2 mm3 for higher sensitivity, respectively) are presented. Segmented electrodes are used, yielding a sensitivity improvement of 10-20 dB compared to conventional electrodes, reduced signal fluctuations due to changing dielectric properties of the surrounding material and less field distortions. The experimentally obtained frequency response of our devices is flat up to f≈3 GHz. At 1 mW optical input power a sensitivity limit of Emin=1 mV/m at 1 Hz bandwidth has been measured. Using a transparent ITO (indium-tin oxide) electrode without a SiO2-buffer layer and with an additionally evaporated 100 nm-layer of amorphous Si, we have obtained a thermal stabilization of the field probes
Keywords :
dipole antennas; electric field measurement; electric fields; electro-optical devices; electrodes; integrated optics; light interferometers; lithium compounds; optical modulation; optical sensors; titanium; 1 Hz; 1 mW; 100 nm; 3 GHz; ITO; InSnO; LiNbO3:Ti; SiO2; SiO2-buffer layer; Ti:LiNbO3 Mach-Zehnder interferometer; amorphous Si; antenna; dielectric properties; field probes; frequency response; higher sensitivity; integrated optical E-field probes; integrated optical E-field sensors; integrated optics; less field distortions; modulator electrode structure; optical input power; segmented electrodes; segmented modulator electrodes; sensitivity improvement; sensitivity limit; signal fluctuations; small size; thermal stabilization; transparent; Dielectric materials; Electrodes; Fluctuations; Integrated optics; Optical distortion; Optical interferometry; Optical materials; Optical modulation; Optical sensors; Probes;
Journal_Title :
Lightwave Technology, Journal of
