Optical interconnects for phase array antennas

H. Yen
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Abstract

Optical interconnects offer several performance advantages for advanced phased-array antennas. New phased-array architecture designs are possible because of the use of photonic technology, which allows the antenna system to be partitioned differently. Functions that can be provided by the optical interconnect include: transmit/receive switch setting, polarization selection, A/D output bus, phase and amplitude control, local oscillator signal distribution, and beam forming or shaping. Some of these functions require digital transmission links, and some require analog microwave links. For the most part the digital links can be implemented using present fiber optic technology. For analog links the insertion loss and signal-to-noise-ratio performance still need to be improved. Nevertheless, fiber optic delay lines have been demonstrated as wideband true time delay microwave phase shifters for antenna beam steering.<>
相控阵天线的光学互连
光学互连为先进的相控阵天线提供了几个性能优势。新的相控阵架构设计是可能的,因为使用光子技术,它允许天线系统被不同地分割。光互连可提供的功能包括:发射/接收开关设置、极化选择、A/D输出总线、相位和幅度控制、本振信号分配、波束形成或整形。这些功能有些需要数字传输链路,有些需要模拟微波链路。在大多数情况下,数字链路可以使用现有的光纤技术实现。对于模拟链路,其插入损耗和信噪比性能仍有待改进。然而,光纤延迟线已经被证明是用于天线波束转向的宽带真延时微波移相器。
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