Abstract

A fiber grating prism that consists of four tunable chirped-grating delay lines for wideband true-time-delay beam forming is proposed and demonstrated. The chirped gratings are produced by use of the grating bending technique in which a uniform grating is surface mounted on a simply supported beam. We obtained chirped gratings with different chirp rates by bending the uniform gratings with different beam deflections. Four linear chirped fiber gratings with identical spectral width but linearly increased grating length are fabricated. The spectra and time-delay responses of the tunable chirped gratings are measured. A chirped-grating prism for wideband true-time-delay beam forming by use of four chirped gratings is constructed and tested experimentally. We obtained different time delays by tuning the wavelength of the optical carrier. The proposed true-time-delay beam former with a four-element phased-array steerer is suitable for continuous beam forming at microwave frequencies up to 20 GHz.

© 2003 Optical Society of America

Waveguide-hologram-based wavelength-multiplexed pseudoanalog true-time-delay module for wideband phased-array antennas

Zhenhai Fu, Charles Zhou, and Ray T. Chen
Appl. Opt. 38(14) 3053-3059 (1999)

Photonic-technique-based highly steerable beamforming system incorporating a prism of super Gaussian apodized tunable chirped fiber Bragg grating for X-band applications

Nimish Kumar Srivastava and Sanjeev Kumar Raghuwanshi
Appl. Opt. 59(10) 3010-3018 (2020)

Continuously-tunable microwave photonic true-time-delay based on a fiber-coupled beam deflector and diffraction grating

Ross T. Schermer, Frank Bucholtz, and Carl A. Villarruel
Opt. Express 19(6) 5371-5378 (2011)

Continuously tunable true-time delay lines based on a one-dimensional grating waveguide for beam steering in phased array antennas

Gencheng Wang, Tingge Dai, Jianfei Jiang, Xiaoqing Guo, Bei Chen, Yuehai Wang, Hui Yu, Xiaoqing Jiang, and Jianyi Yang
Appl. Opt. 57(18) 4998-5003 (2018)

Compact broadband 5-bit photonic true-time-delay module for phased-array antennas

Zhenhai Fu, Richard Li, and Ray T. Chen
Opt. Lett. 23(7) 522-524 (1998)