Title :
Liquid Crystal Phase Shifter for Optically Generated RF-Signals
Author :
Vogel, Wolfgang ; Berroth, Manfred
Author_Institution :
Institute for Electrical and Optical Communication Engineering, University of Stuttgart, w.vogel@int.uni-stuttgart.de
Abstract :
In this paper we present a phase shifter for optically generated RF-signals including a liquid crystal amplitude modulator. The light is intensity modulated by a Mach-Zehnder modulator and split into two paths. One path exhibits a fixed ¿RF/4 delay and a liquid crystal light valve to vary the transmitted amplitude of this path. In the proposed experimental setup the resulting phase ¿RF of the modulated signal can be adjusted from 0° to 45°. The method can be used for a continuous phase shift up to 360° with only four light valves.
Keywords :
Amplitude modulation; Liquid crystals; Optical arrays; Optical modulation; Optical network units; Phase modulation; Phase shifters; Phased arrays; Radio frequency; Valves;
Conference_Titel :
Microwave Conference, 2000. 30th European
Conference_Location :
Paris, France
DOI :
10.1109/EUMA.2000.338765
