Fourier Transform Optical Beamformer Employing Spatial Light Modulator

Tomohiro AKIYAMA; Nobuyasu TAKEMURA; Hideyuki OH-HASHI; Syuhei YAMAMOTO; Masahito SATO; Tsutomu NAGATSUKA; Yoshihito HIRANO; Shusou WADAKA

doi:10.1093/ietele/e90-c.2.465

Fourier Transform Optical Beamformer Employing Spatial Light Modulator

Tomohiro AKIYAMA, Nobuyasu TAKEMURA, Hideyuki OH-HASHI, Syuhei YAMAMOTO, Masahito SATO, Tsutomu NAGATSUKA, Yoshihito HIRANO, Shusou WADAKA

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Optically controlled beam forming techniques are effective for phased-array antenna control. We have developed the Fourier transform optical beamformer (FT-OBF). The antenna radiation pattern inputted into an amplitude spatial light modulator (A-SLM) is optically Fourier transformed to a specific phase-front light beam equivalent to an antenna excitation in the FT-OBF. Optical signal processing, used the Fourier transform optics, is effective to large-scale, two-dimensional, and high-speed signal processing. To implement a flexible and finer antenna beam pattern control, we use an A-SLM as input image formation of the FT optics. And, to realize a small-size FT-OBF, we use symmetric triplet lenses with convex, concave and convex lens. The total optical system becomes below 1/5 length compared with the length using single lens. Finally, we evaluated the developed FT-OBF with the generated amplitude and phase distributions, which excitation signal of an array antenna. We measured an antenna radiation beam pattern, beam steering and beam width control, in the C-band. Measurement results agreed with theoretical calculated results. These results show the feasibility of the spatial light modulator based FT-OBF.

Publication: IEICE TRANSACTIONS on Electronics Vol.E90-C No.2 pp.465-473

Publication Date: 2007/02/01

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Online ISSN: 1745-1353

DOI: 10.1093/ietele/e90-c.2.465

Type of Manuscript: Special Section PAPER (Special Section on Evolution of Microwave and Millimeter-Wave Photonics Technology)

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Tomohiro AKIYAMA, Nobuyasu TAKEMURA, Hideyuki OH-HASHI, Syuhei YAMAMOTO, Masahito SATO, Tsutomu NAGATSUKA, Yoshihito HIRANO, Shusou WADAKA, "Fourier Transform Optical Beamformer Employing Spatial Light Modulator" in IEICE TRANSACTIONS on Electronics, vol. E90-C, no. 2, pp. 465-473, February 2007, doi: 10.1093/ietele/e90-c.2.465.
Abstract: Optically controlled beam forming techniques are effective for phased-array antenna control. We have developed the Fourier transform optical beamformer (FT-OBF). The antenna radiation pattern inputted into an amplitude spatial light modulator (A-SLM) is optically Fourier transformed to a specific phase-front light beam equivalent to an antenna excitation in the FT-OBF. Optical signal processing, used the Fourier transform optics, is effective to large-scale, two-dimensional, and high-speed signal processing. To implement a flexible and finer antenna beam pattern control, we use an A-SLM as input image formation of the FT optics. And, to realize a small-size FT-OBF, we use symmetric triplet lenses with convex, concave and convex lens. The total optical system becomes below 1/5 length compared with the length using single lens. Finally, we evaluated the developed FT-OBF with the generated amplitude and phase distributions, which excitation signal of an array antenna. We measured an antenna radiation beam pattern, beam steering and beam width control, in the C-band. Measurement results agreed with theoretical calculated results. These results show the feasibility of the spatial light modulator based FT-OBF.
URL: https://globals.ieice.org/en_transactions/electronics/10.1093/ietele/e90-c.2.465/_p

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@ARTICLE{e90-c_2_465,
author={Tomohiro AKIYAMA, Nobuyasu TAKEMURA, Hideyuki OH-HASHI, Syuhei YAMAMOTO, Masahito SATO, Tsutomu NAGATSUKA, Yoshihito HIRANO, Shusou WADAKA, },
journal={IEICE TRANSACTIONS on Electronics},
title={Fourier Transform Optical Beamformer Employing Spatial Light Modulator},
year={2007},
volume={E90-C},
number={2},
pages={465-473},
abstract={Optically controlled beam forming techniques are effective for phased-array antenna control. We have developed the Fourier transform optical beamformer (FT-OBF). The antenna radiation pattern inputted into an amplitude spatial light modulator (A-SLM) is optically Fourier transformed to a specific phase-front light beam equivalent to an antenna excitation in the FT-OBF. Optical signal processing, used the Fourier transform optics, is effective to large-scale, two-dimensional, and high-speed signal processing. To implement a flexible and finer antenna beam pattern control, we use an A-SLM as input image formation of the FT optics. And, to realize a small-size FT-OBF, we use symmetric triplet lenses with convex, concave and convex lens. The total optical system becomes below 1/5 length compared with the length using single lens. Finally, we evaluated the developed FT-OBF with the generated amplitude and phase distributions, which excitation signal of an array antenna. We measured an antenna radiation beam pattern, beam steering and beam width control, in the C-band. Measurement results agreed with theoretical calculated results. These results show the feasibility of the spatial light modulator based FT-OBF.},
keywords={},
doi={10.1093/ietele/e90-c.2.465},
ISSN={1745-1353},
month={February},}

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TY - JOUR
TI - Fourier Transform Optical Beamformer Employing Spatial Light Modulator
T2 - IEICE TRANSACTIONS on Electronics
SP - 465
EP - 473
AU - Tomohiro AKIYAMA
AU - Nobuyasu TAKEMURA
AU - Hideyuki OH-HASHI
AU - Syuhei YAMAMOTO
AU - Masahito SATO
AU - Tsutomu NAGATSUKA
AU - Yoshihito HIRANO
AU - Shusou WADAKA
PY - 2007
DO - 10.1093/ietele/e90-c.2.465
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E90-C
IS - 2
JA - IEICE TRANSACTIONS on Electronics
Y1 - February 2007
AB - Optically controlled beam forming techniques are effective for phased-array antenna control. We have developed the Fourier transform optical beamformer (FT-OBF). The antenna radiation pattern inputted into an amplitude spatial light modulator (A-SLM) is optically Fourier transformed to a specific phase-front light beam equivalent to an antenna excitation in the FT-OBF. Optical signal processing, used the Fourier transform optics, is effective to large-scale, two-dimensional, and high-speed signal processing. To implement a flexible and finer antenna beam pattern control, we use an A-SLM as input image formation of the FT optics. And, to realize a small-size FT-OBF, we use symmetric triplet lenses with convex, concave and convex lens. The total optical system becomes below 1/5 length compared with the length using single lens. Finally, we evaluated the developed FT-OBF with the generated amplitude and phase distributions, which excitation signal of an array antenna. We measured an antenna radiation beam pattern, beam steering and beam width control, in the C-band. Measurement results agreed with theoretical calculated results. These results show the feasibility of the spatial light modulator based FT-OBF.
ER -