31 July 1998 Photonic true-time delay line for signal processing
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Abstract
Tapped delay line is a fundamental building block for designing filters and signal processors, specially the adaptive ones. For an example, true time-delay lines are indispensable for electronically beam steered phased array antenna system with multiple nulling capability. Photonic implementation of the delay line with wide bandwidth approaching 100 GHz uses either variable length or variable group velocity as a function of wavelength. Fiber Bragg reflection grating plays an important role for the first case whereas highly dispersive fiber/waveguide or material are the ingredients for the second case. High dispersion is obtained near a resonance of the transmission or absorption curve of the fiber. The resonance properties can be enhanced by using nanoparticles with complex structures such as metal coated dielectric spheres or using so-called photonic bandgap materials. This paper reviews the status of photonic implementation of the delay lines using Bragg gratings, high dispersion fibers, bandgap engineered materials, among others. Theoretical and experimental results are presented for a high dispersion fiber achieved by resonances in a thin metallic film surrounding the fiber core.
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Philipp G. Kornreich, Philipp G. Kornreich, Nitipun Nivartvong, Nitipun Nivartvong, Andrew R. Pirich, Andrew R. Pirich, Pankaj K. Das, Pankaj K. Das, } "Photonic true-time delay line for signal processing", Proc. SPIE 3384, Photonic Processing Technology and Applications II, (31 July 1998); doi: 10.1117/12.317667; https://doi.org/10.1117/12.317667
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