Spherical Fourier Cell and Application for Optical True Time Delay

Rabb, David J.; Anderson, Betty Lise; Cowan, William D.; Spahn, Olga B.

doi:10.1109/jlt.2008.927762

Cited by 6 publications

(5 citation statements)

References 8 publications

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“…Second, because all the beam paths share a single lens, the apparatus can be very compact. Third, many cross-connects can be cascaded around the same lens, similar to the method of cascading time delay devices in [7]. Third, the cross-connect will be comparatively easy to manufacture.…”

Section: Discussionmentioning

confidence: 99%

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Optical Cross-Connect Based on the Spherical Fourier Cell

Rabb

Anderson²

2009

J. Lightwave Technol.

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Abstract-A free-space optical cross connect is proposed here that is highly compact and uses digital microelectromechanical systems (MEMS) tip-style micromirror arrays. Based on the Fourier cell, previously described for true time delays, the cross-connect can be strictly non-blocking, or can be of blocking or reconfigurably blocking designs to reduce the MEMS pixel count. Because in the Fourier cell many systems can share a single spherical lens, the hardware count is comparatively low and the system is highly compact.

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Section: Discussionmentioning

confidence: 99%

“…The Fourier cell has been described previously in [7], where it was introduced for the application of providing optical true-time delays for steering phased array antennas. We will briefly review the principle of operation here.…”

Section: A Fourier Cellmentioning

confidence: 99%

Optical Cross-Connect Based on the Spherical Fourier Cell

Rabb

Anderson²

2009

J. Lightwave Technol.

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“…(2)- (4) into Eq. (1), the normalized AF can be obtained to be (5) From Eq. (5), we can see that TTD technology controls a radiation angle of the beam by changing the time delay.…”

Section: Array Factor Of Phased-array Antennamentioning

confidence: 99%

“…Various optical beam-forming concepts have been previously reported [2][3][4][5][6][7][8]. The techniques other than these are based on optical phase shifters [9], switchable delay matrices [10][11][12][13][14], liquid crystal polarization switching devices [15], a combination of a wavelength-tunable laser and a dispersive optical element, such as a high dispersion fiber [16,17], a fiber optic prism [18,19], a fiber Bragg gratings (FBGs) prism [20][21][22], or chirped FBGs [23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Photonic True-Time Delay for Phased-Array Antenna System using Dispersion Compensating Module and a Multiwavelength Fiber Laser

Jeon¹,

Lee²

2014

Journal of the Optical Society of Korea

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An optical true-time delay beam-forming system using a tunable dispersion compensating module (DCM) for dense-wavelength division modulation (DWDM) and a multiwavelength fiber ring laser for a phased array antenna is proposed. The multiwavelength fiber ring laser has one output that includes four wavelengths; and four outputs that include only single-wavelength. The advantage of such a multiwavelength fiber ring laser is that it minimizes the number of devices in the phased array antenna system. The time delays according to wavelengths, which are assigned for each antenna element, are obtained from the tunable DCM. The tunable DCM based on a temperature adjustable Fabry-Perot etalon is used. As an experimental result, a DCM could be used to obtain the change of the beam angle by adjusting the dispersion value of the DCM at the fixed lasing wavelengths of the fiber ring laser in the proposed optical true-time delay.

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“…Usually, Butler matrix [42] or Rotman lens [7] are used. The Fourier lens [43][44][45] has been widely utilized until recently for the same purpose. This is the most straightforward way to form multiple beams and support a large size array.…”

Section: Multi-beam Optical Beamformersmentioning

confidence: 99%

Investigation on group delay ripple effects and the hybrid approach for optical beamforming

Trung¹

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Optical beamforming techniques can be subdivided into three categories in general [4]. The first approach is the optical implementation of time-integral correlation techniques, which is so difficult in practice that this approach have received considerably less effort. The second approach provides narrow-band phase-only control of a microwave signal at each element. The idea was to reduce size, weight and system complexity while immune to EMI. This idea is further improved in the last category, which includes the optical implementations of large instantaneous bandwidth with true time delay. The optical beamforming proposed in this project

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Spherical Fourier Cell and Application for Optical True Time Delay

Cited by 6 publications

References 8 publications

Optical Cross-Connect Based on the Spherical Fourier Cell

Optical Cross-Connect Based on the Spherical Fourier Cell

Photonic True-Time Delay for Phased-Array Antenna System using Dispersion Compensating Module and a Multiwavelength Fiber Laser

Investigation on group delay ripple effects and the hybrid approach for optical beamforming

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