Optical Delay Lines in High-Silica (SiO2/Si) Waveguides
Recently, there has been a resurgence of interest in the field of optically-controlled phased-array antennas. In some cases, true time delays instead of phase shifters are needed to control the phase of the radiating elements to avoid significant losses in the direction of emission. This kind of phase adjustment cannot be made using conventional microwave technology because of high losses and large dimensions of the waveguides. True time delays have been realised optically using different techniques such as high dispersion fibre1, and micro-mirrors2. However, these methods require prohibitive number of discrete components when used in antennas with large number of radiating elements. In this paper, a serial approach, similar to that of Sullivan and al3, which provides multiple delays in a single integrated-optic device working at 1.3 μm, is explored.
KeywordsExtinction Ratio Beam Propagation Method Phase Array Antenna Straight Waveguide Curve Waveguide
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- 3.C. T. Sullivan and al., Switched time delay elements based on AlGaAs/GaAs optical technology at 1.32 μm for optically controlled phased array antennas, SPIE- Optoelectronic Signal Processing for Phased Array Antennas III, vol. 1703, no. 36 (1992)Google Scholar
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