Abstract
A programmable broadband Radio Frequency (RF) filter is designed
using a Digital Micromirror Device (DMD), an Acoustooptic Tunable Filter (AOTF),
and a Chirped Fiber Bragg grating (CFBG). This hybrid analog-digital optical
design enables implementation of RF filters with higher number of taps in
comparison with an AOTF-only RF filter design and improved RF tunability in
comparison with a DMD-only design. A 3-tap RF filter is theoretically analyzed
and experimentally demonstrated using a combination of analog and digital
optical tap selection. Filter nulls recorded at 6.90, 6.945, and 6.99 GHz
show the tunability improvement with the hybrid design. Implementation of
higher tap count filters can lead to similar improvements in filter tunability
and pass-band and stop-band characteristics.
© 2008 IEEE
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