Photonic true time delay for high-frequency phased array systems

Monsay, Evelyn H.; Baldwin, Kevin; Caccuitto, M.J.

doi:10.1109/68.265909

Cited by 21 publications

(5 citation statements)

References 1 publication

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“…In calculations reported by Monsay 6 and Monsay et al, 7 these deviations were modeled and the results compared successfully with the available data. The deviations were found to arise from diffraction effects due to the finite size of the optical beam probing, or ''reading out,'' the phase of the acoustic wave in the AOM.…”

Section: Introductionmentioning

confidence: 92%

Analysis of a radar beamformer based on a photonic delay line

Monsay

1997

Opt. Eng

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A photonic means of generating the element-to-element phase shifts required for the operation of a true time delay radar beamformer was developed previously by Toughlian and Zmuda for systems operating in the VHF frequency range, and extended by Monsay for operation in the radar C band. The photonic beamformer is based on an acousto-optic (AO), heterodyne optical system in which the reference beam acts as a probe of the acoustic wave in the AO cell. The time delay of the acoustic waveform readout by the optical probe from various locations along the length of the AO cell can then be imposed directly on the microwave elements of the radar beamformer, providing the correct phase for each element at whatever frequency drives the AO cell. Fundamental systems-oriented calculations are reported. Results for both optical specifications and radar performance specifications are obtained based on a mathematical model of the photonic delay line previously developed by the author. These results address the use of the photonic delay line in a standard radar beamformer. © 1997 Society of Photo-Optical Instrumentation Engineers. [S0091-3286(97)01412-8]

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Section: Introductionmentioning

confidence: 92%

Analysis of a radar beamformer based on a photonic delay line

Monsay

1997

Opt. Eng

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“…It offers advantages such as quick, accurate beam steering without physical movement and conformal mounting. The optical true-time-delay techniques have the potential to solve the socalled beam squint effect which exist in the conventional microwave phase shifter based phased-array antennas [1,2,3]. As the optical carriers modulated by the microwave signals are transmitted via fibers, optical true-time-delay techniques can greatly reduce the noises from the external electromagnetic interferences and internal electromagnetic coupling.…”

Section: Introductionmentioning

confidence: 99%

Holographic-grating-based optical-controlled true-time-delay devices

Shi

Jiang

et al. 2004

SPIE Proceedings

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The holographic-grating based wavelength-controlled true-time-delay devices are presented in the paper. The optical true-time-delay can be continuously controlled by continuously tuning the wavelength of a single laser within the devices. The dispersion ability of the devices is greatly enhanced by increasing the diffraction angles of the holographic gratings. The fabricated true-time-delay devices work within 1550nm region. The loss performance of the devices were calculated and measured. The wavelength-controlled true-time-delay was also characterized both theoretically and experimentally.

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“…In [9], the author proposed a photonic system that assures broadband operation, but it only allows a discrete number of beam pointing angles and also it is suitable only for microwave frequencies less than or equal to 6 GHz. Subsequently, to achieve continuous beam steering [10] at higher microwave frequencies [11], chirped FBGs [12] or chirped grating-based prism may be used in the optical beamforming network. Chirped FBG array [13][14][15] based on the technique of photonic beam steering of phased array antenna, working in transmitting and receiving mode has been demonstrated in [16].…”

Section: Introductionmentioning

confidence: 99%

Demonstration of super‐Gaussian apodized linearly chirped fiber Bragg grating for efficient beam steering in Ku‐band applications

Srivastava

Raghuwanshi

Parihar

2021

IET Optoelectronics

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This paper demonstrates a photonic-based wideband TTD beamforming will demonstrate network employing super-Gaussian apodized chirped fiber Bragg grating (SGFBG) of different lengths (each having central wavelength of 1550 nm) such as 5, 4.5, 4, 3.5, 3, 2.5, 2, 1.5 cm as well as varying chirp rate, which can be used as variable TTD lines for controlling the radiation angle of PAA (the main lobe radiated by the PAA can be steered squint-free between 0°and ± 69°) suitable for continuous beamforming at microwave frequencies in . The experimental demonstration shows the effect of change in laser wavelength on delay incurred within the reflected light from the SGFBG. This delay in modulated optical signal will be converted into delayed microwave signal feed to respective element of PAA after passing through photodetector. Finally, the time-delayed microwave signal feeded to each element of PAA will be responsible for tilt in microwave signal compared to the horizontal direction. Novelty of the proposed SGFBG as compared to linearly chirped fiber Bragg grating (LCFBG) is in terms of reduction in ripples in delay spectrum which will lead to exact delay introduction in the optical signal.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Photonic true time delay for high-frequency phased array systems

Cited by 21 publications

References 1 publication

Analysis of a radar beamformer based on a photonic delay line

Analysis of a radar beamformer based on a photonic delay line

Holographic-grating-based optical-controlled true-time-delay devices

Demonstration of super‐Gaussian apodized linearly chirped fiber Bragg grating for efficient beam steering in Ku‐band applications

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