Dispersion-induced bandwidth limitation of variable true time delay lines based on linearly chirped fibre gratings

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Dispersion-induced bandwidth limitation of variable true time delay lines based on linearly chirped fibre gratings

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The electrical bandwidth limitation of continuous variable time delay units based on chirped fibre gratings is studied. The radiofrequency response of a linearly chirped fibre grating with an optical bandwidth of 4 nm and a dispersion of nearly 850 ps/nm has shown a –3 dB bandwidth of 6.4 GHz. To overcome this limitation, the use of a single-sideband plus carrier generator employing a dual-drive electro-optical modulator is experimentally demonstrated.

Inspec keywords: electro-optical modulation; chirp modulation; optical fibre dispersion; optical delay lines; diffraction gratings

Other keywords: variable true time delay lines; dispersion-induced bandwidth limitation; optical bandwidth; radiofrequency response; 6.4 GHz; single-sideband plus carrier generator; dual-drive electro-optical modulator; linearly chirped fibre gratings

Subjects: Modulation and coding methods; Fibre optics; Electro-optical devices

References

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      • J.L. Cruz , B. Ortega , M.V. Andrés , B. Gimeno , P. Pastor , J. Capmany , L. Dong . Chirped fibre Bragg gratings for phased-array antennas. Electron. Lett. , 7 , 545 - 546
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      • G.J. Meslener . Chromatic dispersion induced distortion of modulated monochromatic light employing direct detection. IEEE J. Quantum Electron. , 10 , 1208 - 1216
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      • Smith, G.H., Novak, D., Ahmed, Z.: `Novel technique for generation of optical SSB with carrier using a single MZM to overcome fibre chromatic dispersion', PDP-2, Int. Topical Meeting on Microwave Photonics, December 1996, Kyoto, Japan.
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      • J.E. Roman , M.Y. Frankel , P.J. Matthews , R.D. Esman . Time-steered array with a chirped grating beamformer. Electron. Lett. , 8 , 652 - 653
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