True-time-delay beam forming using Bragg grating resonators

Leslie H. Gesell; Stephen M. Evanko

doi:10.1117/12.259007

22 November 1996 True-time-delay beam forming using Bragg grating resonators

Leslie H. Gesell, Stephen M. Evanko

Proceedings Volume 2844, Photonics and Radio Frequency; (1996) https://doi.org/10.1117/12.259007
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

A new photonics concept for true time delay beamforming and steering is described. To delay a signal an array of fibers, or other optical waveguides, containing cavities of different resonant frequencies are used to channelize the signal. Each spectral component of the signal is phase shifted by an amount proportional to the frequency of that spectral component and proportional to the time delay desired. These phase shifted spectral components are then summed to obtain the delayed signal. This new approach does not rely on switching between different lengths of delay lines. As a result, the pointing direction of an antenna array can be finely controlled over a continuum of angles, and the time to change direction can be on the order of 10 nanoseconds or faster. The concept has been refined, analyzed, and implementation issues addressed. The approach appears to be feasible. All the integral components with characteristics necessary to meet the requirements of an operational true time delay beamforming system are realizable. The time delay module as a channelizer has a number of alternate applications. For electronic warfare the channelizer provides the ability to analyze a wide bandwidth signal on the order of tens of Gigahertz at a resolution of 10 to 20 Megahertz. As a wavelength demultiplexer in optical communications, it would allow for a greatly increased density of channels within a given spectral range.

Citation Download Citation

Leslie H. Gesell and Stephen M. Evanko "True-time-delay beam forming using Bragg grating resonators", Proc. SPIE 2844, Photonics and Radio Frequency, (22 November 1996); https://doi.org/10.1117/12.259007

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KEYWORDS

Resonators

Optical fibers

Phase shifts

Optical resonators

Quantum wells

Fiber Bragg gratings

Signal detection

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