Variable time delay of microwave signals using high dispersion fibre

Johns, Steven T.; Norton, Douglas A.; Keefer, Christopher W.; Erdmann, Reinhard; Soref, Richard A.

doi:10.1049/el:19930370

Cited by 27 publications

(12 citation statements)

References 3 publications

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“…. ( 1 ) For our discussion are, besides the standard optical fibres, of special interest high dispersion (HD) fibers. They are employed and shown in the following examples.…”

Section: True Time Delaymentioning

confidence: 99%

<title>Overview of optically driven antenna systems</title>

Ritosa

Batagelj

2008

SPIE Proceedings

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In this paper, simple methods to obtain phase shifts and an amplitude regulation using electro-optical technique, with purpose to drive antenna array systems, are presented. This solution comprises true-time delay properties of the optics fiber, driven by tuneable lasers. In the following overview, several techniques proposed by different authors are presented. All methods are based on the same idea, which consists on setting the radiofrequency (RF) signal phase and amplitude in the optical domain instead of using radiofrequency techniques. Trough the electro-optical conversion the RF signal is transferred onto an optical carrier, where it can be influenced to achieve the desired result.

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“…. ( 1 ) For our discussion are, besides the standard optical fibres, of special interest high dispersion (HD) fibers. They are employed and shown in the following examples.…”

Section: True Time Delaymentioning

confidence: 99%

<title>Overview of optically driven antenna systems</title>

Ritosa

Batagelj

2008

SPIE Proceedings

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“…More specifically, a ternary optical layout switched PDL design can lead to a redistribution of PDL structure weight and physical volume 62 . Unlike the binary switched PDL, where module cascading happens in one dimension leading to a "long" barrel-type physical structure, the ternary switched PDL design requires fewer modules per cascading direction for the same amount of variable delays.…”

Section: Hardware Compressionmentioning

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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“…Fiber based delay lines have been demonstrated by Gweon and Moslehi [1,2] but were limited to fixed lengths which produced fixed delays. The method presented here was first suggested by Soref [3,4] and later demonstrated by Johns and Esman [5,6]. This method employs a single length of high dispersion fiber with a variable wavelength laser.…”

Section: Introductionmentioning

confidence: 96%