Silica-waveguide optical time-shift network for a 96-element L-band conformal array

Ng, W.; Loo, Ronald K.; Jones, V. L.; Lewis, Jack B.

doi:10.1109/leosst.1995.764184

Cited by 4 publications

(5 citation statements)

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“…Typically, the time delay is quantized in units of one rf wavelength with phase shifters providing subperiod control at the subarray level. 6 The total number of discrete time delays is then (M/2)sin «,", ~ 32, or 5 bits. The total delay corresponds to an ~128-cm length of silica waveguides.…”

Section: Resultsmentioning

confidence: 99%

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Recirculating Photonic Filter (RPF): A Wavelength Selective True Time Delay for Optically Controlled Phased Array Sensors

Jalali¹

2000

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Section: Resultsmentioning

confidence: 99%

“…Recently silica waveguide delay lines up to 100 cm were demonstrated. 6 Thus it is anticipated that the necessary delay lines can be readily integrated on a single substrate.…”

Section: Resultsmentioning

confidence: 99%

Recirculating Photonic Filter (RPF): A Wavelength Selective True Time Delay for Optically Controlled Phased Array Sensors

Jalali¹

2000

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“…Nevertheless, the Hughes Corporation approach requires many lasers and/or photodetectors for each channel that leads to excess optical power wastage and/or expenses. A 16-channel 5-bit time delay network was demonstrated by Thomson-CSF-France 49 . This was a visible band transmit-only heterodyne detection based system that uses slow (e.g., 100 ms) nematic liquid crystal polarization switching devices.…”

Section: Three Dimensional Pdl Based On Flc Polarization Switching Armentioning

confidence: 99%

Photonic delay lines: technology trends and challenges

Madamopoulos

Dingel

2003

SPIE Proceedings

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The use of photonics for phased array antenna (PAA) control is a vital area of applied research. In particular, the potential impact of compact, low cost, photonically controlled PAAs for large scale global applications, such as wireless communications, is a major business growth area. This paper presents an overview of technology approaches for photonic delay lines (PDLs) as well as the challenges. Polarization based switched PDLs using two-dimensional (2D) liquid-crystal devices are discussed. In particular, 2-D ferroelectric liquid crystal devices are used as polarization switches in PDLs to control and process optical signals. The experimental demonstration of a multichannel 7-bit PDL system for a wideband PAA such as the Navy's advanced Aegis radar system is presented. Finally, we present novel approaches for hardware and control complexity reduction. One hardware compression approach is based on ternary PDL designs and wavelength division multiplexing. The other approach is based on the Dingel-resonator which functions as a novel prism-like optical device using Gires-Tournois Resonator (GTR) whose front surface mirror is coated with pre-defined spatial reflectivity profile.

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“…Using this testbed, we demonstrated (Section 2. 1) that a broadband photonic beamformer can enable squint-free operation from L-band (1-2.6 0Hz) to X-band (8)(9)(10)(11)(12). Meanwhile, great improvements were made in the NF and SFDR of analog fiber optic links with the development of: (i) directly modulated links using low noise (RIN --160 dB/Hz) DFB lasers with high (fiber-coupled) slope efficiencies (-0.15 mW/mA), and (ii) externally modulated links4 using high power (P0>lOO mW) ?…”

Section: Photonic Phased Array Steered Via Ttdmentioning

confidence: 99%