Optical true time delay unit for multi-beamforming
نویسندگان
چکیده
منابع مشابه
Opto-VLSI-Based Broadband True-Time Delay Generation for Phased Array Beamforming
Electronically controlled phased-array antennas can adaptively scan radiated beams in three-dimensional space without mechanically moving parts. While most of the research on phased-array antennas has been focusing on broadband beam steering less attention has been devoted to null steering. Broadband null steering requires a beamformer that can generate variable and frequency independent true t...
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Photonic microwave true-time delay eliminates the beam squint problem in broadband phased-array antenna. However the large insertion losses associated with the optical switching network that selects the appropriate delay line is a serious limitation. We have previously demonstrated a unique photonic filter that uses the optical carrier wavelength in the 1550 nm wavelength band to select the des...
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In this letter, a Photonic True Time Delay (PTTD) unit for phased array antennas is experimentally demonstrated. The PTTD unit, employing a single wavelength laser source, exploits the distributed photonic bandgap offered by a Linearly Chirped Fiber Bragg Grating (LCFBG) to attain different time delays by properly actuating the physical and geometrical features of the LCFBG through temperature ...
متن کاملUltra-compact optical true time delay device for wideband phased array radars
An ultra-compact optical true time delay device is demonstrated that can support 112 antenna elements with better than six bits of delay in a volume 16”x5”x4” including the box and electronics. Free-space beams circulate in a White cell, overlapping in space to minimize volume. The 18 mirrors are slow-tool diamond turned on two substrates, one at each end, to streamline alignment. Pointing accu...
متن کاملOptical true time delay for phased-array antennas: demonstration of a quadratic White cell.
We have demonstrated a proof-of-concept optical device that can produce true time delays for a phased-array radar. This device combines White cells of differing lengths with a spatial light modulator to select between the paths on multiple bounces of a given beam. The approach can handle thousands of light beams and produce hundreds of different delays. The number of delays is proportional to t...
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ژورنال
عنوان ژورنال: Optics Express
سال: 2015
ISSN: 1094-4087
DOI: 10.1364/oe.23.010002