Squint compensation for a broadband RF array spectral imager using spatial spectral holography

Schlottau, Friso; Braker, Benjamin; Wagner, Kelvin

doi:10.1117/12.559689

Cited by 4 publications

(1 citation statement)

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“…2 Optical signal processing schemes are suitable for this massively parallel signal processing of large antenna arrays since multi-GHz signals can be modulated on an optical carrier, and a Fourier lens based optical processor can form all the beams in parallel. 3 Previous RF photonic phased-array receivers utilized electro-optic modulators (EOM) arranged in a miniaturized topology of the RF antenna array to modulate a CW laser, and the modulated array of optical signals was spatially Fourier transformed by a lens. 4 The position in the focal plane of the Fourier lens is proportional to the sine of the angle-of-arrival (AOA) of the incoming RF signal and is also proportional to the RF frequency, so broadband RF signals lead to frequency-dependent beam steering known as beam-squint.…”

Section: A) B)mentioning

confidence: 99%

Acousto-optic tunable filter using phased-array transducer with linearized RF to optical frequency mapping

et al. 2005

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We present an optimized design of an acousto-optic tunable filter (AOTF) using a phased-array transducer for a spectrally-multiplexed ultrafast pulse-shaping RF beamformer application. The momentum-space interaction geometry is used to optimize an AOTF using acoustic beam-steering techniques in combination with acoustic anisotropy in order to linearly map the applied RF frequency to the filtered output optical frequency. The appropriate crystal orientation and phased-array transducer design are determined to linearize the RF to optical frequency mapping even in the presence of optical dispersion of the birefringence. After optimizing the phasedarray transducer, acoustic anisotropy, and optical anisotropic diffraction geometry, the designed AOTF will compensate for the birefringent dispersion of TeO 2 to give a linear modulation of RF frequencies onto the corresponding optical frequencies. This linearized frequency mapped AOTF is required for a squint-compensated, wavelength-multiplexed, optically processed RF imager.

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Section: A) B)mentioning

confidence: 99%