&lt;title&gt;Acousto-optic control of time delays for array beam steering&lt;/title&gt;

Gesell, Leslie H.; Feinleib, Richard E.; Lafuse, James L.; Turpin, Terry M.

doi:10.1117/12.177401

Cited by 24 publications

(17 citation statements)

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“…12. Although especially efficient for transmitting, the somewhat limited dynamic range of the acousto-optic Bragg cell could compromise its use in certain receiving applications.…”

Section: True Time Delay Beamforming Using Fiber Optic Cavitiesmentioning

confidence: 99%

Optical signal processing at Essex Corporation

Franklin¹

1996

Opt. Eng

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The most current research and development in optical signal processing and its applications at Essex Corporation is summarized. In progress for more than a decade, this work has evolved from the development of highly specialized algorithms for the intelligence community to more general domains embracing such diverse areas as radar signal processing, medical ultrasound and magnetic resonance imaging, acoustic tomography, and cellular and satellite communications. Essex develops algorithms and designs, fabricates, and tests breadboard designs and transforms these into rugged, compact products for use in harsh environments. Descriptions of the most important investigations in these areas are presented. An image synthesizer called ImSyn™ is described that forms images from the measured spatial Fourier components of the object to be imaged. Applications to synthetic aperture radar, acoustic tomography, medical resonance imaging, and synthetic aperture microscopy are shown. An acousto-optic radar signal processor is described that can produce high-resolution, high-dynamic range rangeDoppler maps from instantaneously wideband radar returns. A design for a fiber optic true-time delay beamformer is presented. Finally, an optoelectronic telecommunications switch is discussed.

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“…12. Although especially efficient for transmitting, the somewhat limited dynamic range of the acousto-optic Bragg cell could compromise its use in certain receiving applications.…”

Section: True Time Delay Beamforming Using Fiber Optic Cavitiesmentioning

confidence: 99%

Optical signal processing at Essex Corporation

Franklin¹

1996

Opt. Eng

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“…is, for highly reflective mirrors, strongly peaked at the cavity resonant frequencies fm+foT Therefore the output ofa resonant cavity as given by Equation (3) can be approximated as s0(t) Sp.y(fm)eJ2;rfmtei27tfot (5) The spacing between the resonant frequencies of a single cavity, the free spectral range of the cavity, must be wider than the bandwidth of the signal. Therefore, a cavity, with a resonant frequency fR' will transmit only one narrow frequency band within the entire signal bandwidth.…”

Section: Spectrum From Resonatorsmentioning

confidence: 99%

Optical resonators for true-time-delay beam steering

Gesell¹,

Evanko²

1996

SPIE Proceedings

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Conventional true time delay beaniforming and steering devices rely on switching between various lengths of delay line. Therefore only discrete delays are possible. Proposed is a new photonics concept for true time delay beamforming which provides a finely controlled continuum of delays with switching speeds on the order of 10's of nanoseconds or faster. The architecture uses an array of waveguide cavities with different resonate frequencies to channelize the signal. Each spectral component ofthe signal is phase shifted by an amount proportional to the frequency of that component and the desired time delay. These phase shifted spectral components are then summed to obtain the delayed signal. This paper provides an overview ofthe results of a Phase I SBIR contract where this concept has been refined and analyzed. The parameters for an operational system are determined and indication of the feasibility of this approach is given. Among the issues addressed are the requirements of the resonators and the methods necessary to implement fiber optic Bragg gratings as these resonators.

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“…Photonic true-time-delay (TTD) offers better performance with reduced cost, size, weight, and power (C-SWaP) over traditional electronic solutions, especially for simultaneous multi-user, multi-target tracking capability in phased array sensor applications. Several photonic TTD schemes have been proposed to take advantages of an optical feed for TTD, including WDM technique [2][3][4][5], slow-light waveguide technique [6], monolithic waveguide technique [7], acousto-optic (AO) integrated circuit technique [8][9][10], Fourier optical technique [11][12][13], bulky optics techniques [14][15][16][17][18][19], Bragg-fiber technique, dispersive fiber technique [20][21][22][23][24], fiber grating technique [25][26], and substrate guided wave techniques [27][28][29]. Use of photonic systems on air-borne and space-borne platforms or integration of several communication and sensing units on a single chip for improved reliability will require individual components to have smaller size, lower power consumption, and lighter weight.…”

Section: Introductionmentioning

confidence: 99%

Silicon nanomembrane-based compact true-time-delay module on unconventional substrates

Subbaraman

Chen

2014

Silicon Photonics IX

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We demonstrate several building blocks of true-time-delay (TTD) network, including subwavelength grating couplers, photonic crystal waveguide TTD lines, and multimode interferometer (MMI) power splitters fabricated on silicon nanomembrane (SiNM) transferred onto unconventional substrates, such as glass, Kapton. Bending tests performed on flexible gratings demonstrate operation even at ~15mm bending radius, with about 5dB loss. The 1x16 cascaded multimode interference (MMI) based power splitter demonstrates uniformity of 0.96dB across all the 16 output channels, and an insertion loss of 0.56dB.The photonic crystal waveguides are designed to provide large time delay values within a short length. Photonic crystal tapers are implemented at the strip-photonic crystal waveguide interfaces to minimize loss and provide larger time delay values. A large group index of ~28.5 is calculated from the measurement data, thus indicating achievability of time delay larger than 58ps per millimeter length of the delay line within a tuning range of 20nm. The demonstrated building blocks present a viable path for obtaining scalable TTD modules on unconventional substrates.

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<title>Acousto-optic control of time delays for array beam steering</title>

Cited by 24 publications

References 0 publications

Optical signal processing at Essex Corporation

Optical signal processing at Essex Corporation

Optical resonators for true-time-delay beam steering

Silicon nanomembrane-based compact true-time-delay module on unconventional substrates

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