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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

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Optical BEAMTAP beam-forming and jammer-nulling system for broadband phased-array antennas.

G Kriehn¹, A Kiruluta, P E Silveira

¹Department of Electrical and Computer Engineering, University of Colorado, Optoelectronic Computing Systems Center, Boulder, Colorado 80309-0425, USA. gregory.kriehn@colorado.edu

|March 14, 2008

Summary

A new algorithm significantly reduces hardware for broadband beamforming in large antenna arrays. This method enables optimal adaptation to complex signal environments for radar, sonar, and communication systems.

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Published on: August 12, 2013

Area of Science:

Electrical Engineering
Signal Processing
Optics

Background:

Adaptive antenna arrays are crucial for modern radar, sonar, and communication systems.
Conventional beamforming techniques require substantial hardware, especially for large, broadband arrays.
Existing methods struggle with complex spatiotemporal signal environments.

Purpose of the Study:

To present an efficient and compact optical implementation for broadband beamforming and jammer nulling.
To introduce a novel algorithm that drastically reduces hardware requirements for adaptive antenna arrays.
To enable optimal adaptation to complex signal environments using photonic systems.

Main Methods:

Development of the broadband efficient adaptive method for true-time-delay array processing (BEAMTAP) algorithm.
Utilizing radio frequency (RF) photonic systems with coherent optically modulated fiber-optic feed networks.
Employing gratings in photorefractive crystals for adaptive weights and acousto-optic devices for weight adaptation control.

Main Results:

Reduced the number of tapped delay lines from N to 2 for an N-element phased-array antenna.
Achieved full NM degrees of freedom with significantly reduced hardware compared to conventional methods.
Demonstrated the capability to adapt to broadband signals, interference, and jammers from arbitrary angles.

Conclusions:

The BEAMTAP algorithm offers enormous savings in delay-line hardware for large broadband arrays.
Photonic systems, leveraging photorefractive crystals, can control arbitrarily large antenna arrays.
This approach surpasses conventional RF and digital signal processing techniques for complex adaptive array applications.