Carrier-to-noise ratio and sidelobe level in a two-laser model optically controlled array antenna using Fourier optics

Konishi, Yoshihiko; Chujo, Wataru; Fujise, M.

doi:10.1109/8.204736

Cited by 21 publications

(13 citation statements)

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“…One of the most powerful approaches is a spatial optical processing method, B Liu-li Wu wll_me1991@163.com 1 Department of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, Hunan, People's Republic of China which was originally proposed by Keopf [1]. This method implements the division, interconnection and combination of light spatially and thus has advantage in terms of bandwidth, circuit complexity and processing speed over conventional techniques [2][3][4][5][6][7][8][9][10]. A typical application of this method is a beam-forming network which is called spatial optical beamforming network (SOBFN) [4,5].…”

Section: Introductionmentioning

confidence: 98%

“…To solve this problem, the application of optical technology to microwave array antennas has been studied for years [1][2][3][4][5][6][7][8][9][10][11]. One of the most powerful approaches is a spatial optical processing method, B Liu-li Wu wll_me1991@163.com 1 Department of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, Hunan, People's Republic of China which was originally proposed by Keopf [1].…”

Section: Introductionmentioning

confidence: 99%

“…A typical application of this method is a beam-forming network which is called spatial optical beamforming network (SOBFN) [4,5]. A variety of functions such as carrier-to-noise ratio and sidelobe level [2], multibeam transmission [4] and reception [5][6][7], and beam scanning [8] have been proposed and experimentally demonstrated for this system. The application of optical procedure greatly changes the signal observation model of SOBFN, so new direction finding (DF) methods in view of the new structure are needed.…”

Section: Introductionmentioning

confidence: 99%

“…Traditional beam-forming networks suffer from time-delay inconsistency among different-frequency components when receiving wideband signals [1,2]. To solve this problem, the application of optical technology to microwave array antennas has been studied for years [1][2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A direction finding method for spatial optical beam-forming network based on sparse Bayesian learning

Liu

Wen-li

2016

SIViP

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This paper addresses the problem of directionof-arrival (DOA) estimation of multiple sources for spatial optical beam forming network (SOBFN). A method which utilizes sparse Bayesian learning techniques to reconstruct the spatial power spectrum of the signals is proposed. The reconstruction procedure takes advantage of the amplitude distribution of the fiber-array output and the spatial sparsity of the incident signals. The reconstructed spectrum contains some evident peaks that indicate the coarse directions of the radiation sources. Then, a linear interpolation procedure is applied to make the DOA estimation results more precise. Sufficient numerical simulations are carried out to verify the performance of the proposed algorithm. Simulation results show that the proposed method fits well with the signal model of SOBFN and has favorable DOA estimation performance.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A direction finding method for spatial optical beam-forming network based on sparse Bayesian learning

Liu

Wen-li

2016

SIViP

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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

SPIE Proceedings

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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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An optically controlled array antenna with a beam‐forming network (BFN) using two laser sources

Konishi¹,

Chujo²,

Fujise³

1995

Electron. Comm. Jpn. Pt. I

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With respect to the optically controlled array antenna in which the optical Fourier transform and the O/E conversion are used for generation and control of the microwave excitation distribution in the optical region, the excitation amplitude and phase distribution and the radiation characteristics are studied theoretically and experimentally for a two‐laser system in which two laser sources with their oscillation frequency difference set at the desired microwave frequency are used. First, the excitation distribution and the radiation pattern are expressed theoretically in the case where a circular aperture image mask is used and the relationship between the image mask aperture diameter and the element antenna spacing is derived. Next, a two‐laser experimental system is shown which uses LD pumped Nd: YAG lasers as the laser sources. an excitation distribution experiment was carried out at 1.54 GHz. From the experimental results, it is found that a stable excitation distribution corresponding to the theoretical value can be obtained in the experimental system in the two‐laser system as in the one‐laser system. Further, by using the measured excitation distribution, the array radiation pattern is computed. In this way, it is confirmed that the radiation pattern in a beam shape corresponding to the image mask aperture diameter can be obtained.

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Carrier-to-noise ratio and sidelobe level in a two-laser model optically controlled array antenna using Fourier optics

Cited by 21 publications

References 13 publications

A direction finding method for spatial optical beam-forming network based on sparse Bayesian learning

A direction finding method for spatial optical beam-forming network based on sparse Bayesian learning

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

An optically controlled array antenna with a beam‐forming network (BFN) using two laser sources

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