Proceedings ArticleDOI
Liquid Crystal Phase Shifter for Optically Generated RF-Signals
Wolfgang Vogel,Manfred Berroth +1 more
- pp 1-4
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TLDR
In this paper, a phase shifter for optically generated RF-signals including a liquid crystal amplitude modulator is presented, where the light is intensity modulated by a Mach-Zehnder modulator and split into two paths.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.read more
Citations
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Journal ArticleDOI
Microwave Photonic Array Radars
TL;DR: In this article, the authors introduce a general architecture of microwave photonic array radar systems and review the recent advancement of optical beamforming networks and discuss the key elements for modelling the response of the true time delay (TTD) and/or phase-shifting unit.
Journal ArticleDOI
Design of a vector-sum integrated microwave photonic phase shifter in silicon-on-insulator waveguides
Pengfei Qu,Caixia Liu,Wei Dong,Weiyou Chen,Fumin Li,Haibin Li,Zhaoxin Gong,Shengping Ruan,Xindong Zhang,Jingran Zhou +9 more
TL;DR: This work, for the first time to the authors' knowledge, provides an attractive solution to transferring a vector-sum method based bulk MWPPS into a integrated one, which is very important for large-scale optically controlled phase array antenna.
Dissertation
Conception et réalisation de filtres microondes planaires accordables par varactors, à base de structures périodiques
TL;DR: In this paper, the authors propose three topologies of filtres accordable dans le domaine RF/microondes, bases on the structures periodiques planaires constituees de lignes de propagation and de capacites chargeant ces lignés.
Patent
A lighting device
TL;DR: In this article, a lighting device, comprising at least one light source for generating light and means for influencing the direction of the light emitted by the lighting device is described. But the authors do not consider the effect of phase modifiers.
References
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Journal ArticleDOI
Voltage-Dependent Optical Activity of a Twisted Nematic Liquid Crystal
Martin Schadt,Wolfgang Helfrich +1 more
TL;DR: In this paper, a new electrooptical effect in twisted nematic liquid crystals is described which allows variation of the rotation of linearly polarized light continuously from 0° to 90°.
Journal ArticleDOI
Optical generation of very narrow linewidth millimetre wave signals
TL;DR: In this article, a novel method for the optical generation and distribution of millimetre waves is described, which is demonstrated at 36 GHz and an electrical linewidth limited by the resolution bandwidth of the spectrum analyser is achieved.
Journal ArticleDOI
Multifunctional fiber-optic microwave links based on remote heterodyne detection
TL;DR: In this article, a remote heterodyne detection (RHD) of signals from a dual-frequency laser transmitter is discussed and experimentally demonstrated and the resulting links are inherently transparent.
Journal ArticleDOI
Modular solid optic time delay system
TL;DR: A novel, modular solid optic time delay system for wide bandwidth phases arrays and other applications based on polarization switches and polarizing beam splitters is introduced.
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