Discrete-chirped fiber Bragg grating prism for wideband true-time--delay unit

Yunqi Liu; Jiangliang Yang; Jianping Yao

doi:10.1117/12.455416

27 December 2001 Discrete-chirped fiber Bragg grating prism for wideband true-time-delay unit

Yunqi Liu, Jiangliang Yang, Jianping Yao

Proceedings Volume 4490, Multifrequency Electronic/Photonic Devices and Systems for Dual-Use Applications; (2001) https://doi.org/10.1117/12.455416
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

A fiber grating prism consisting of a chirped grating delay line and three delay lines with thirteen discrete fiber Bragg gratings is fabricated and experimented. The system comprises a chirped grating for short time delays and three discrete Bragg grating arrays for long time delays. The introduction of the chirped grating delay line enables the system to work for beamforming at higher microwave frequencies. The experimental results of the time delay measurements agree well with the theoretical calculations. Based on the experimental data, the radiation patterns of a 4-elements array are calculated and analyzed. This fiber grating prism can provide four-channel time-delayed signals that can be fed to an antenna array to achieve beam scanning at different radiation angle. The beampointing direction of the system is determined by the grating spacing and independent of the microwave frequency. The proposed true- time delay unit with 4 X 13 phased array steerer is suitable for beamforming at frequencies up to 6 GHz.

Citation Download Citation

Yunqi Liu, Jiangliang Yang, and Jianping Yao "Discrete-chirped fiber Bragg grating prism for wideband true-time-delay unit", Proc. SPIE 4490, Multifrequency Electronic/Photonic Devices and Systems for Dual-Use Applications, (27 December 2001); https://doi.org/10.1117/12.455416

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