Comb-based radio-frequency photonic filtering with 20 ns bandwidth reconfiguration

Wu, Rui; Song, Minhyup; Leaird, Daniel E.; Weiner, Andrew M.

doi:10.1364/ol.38.002735

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…3(b), the dominant noise terms (shot noise and excess noise) are also reduced as the α decreases from 0.5 towards 0. The RF gain and excess noise in (13) and (19), respectively, have the same factor of α(1 − α), related with the input split coefficient. When the excess noise dominates, the NF remains constant as the input split coefficient is varied.…”

Section: Simulationmentioning

confidence: 99%

“…In [16] and [18], reconfigurable phase filters were implemented and applied for compression of wideband RF chirp signals. Using a similar comb-based RF filter configuration but without the interferometer, rapid (ß20 ns) bandwidth reconfiguration was demonstrated in [19], and simultaneous tunable bandpass filtering and downconversion was reported in [20]. Thus, such comb-based RF photonic filters offer a degree of reconfigurability far beyond what is currently available from other technologies, as well potential for extremely fast tuning and reconfigurability.…”

Section: Introductionmentioning

confidence: 99%

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Comb-Based RF Photonic Filters Based on Interferometric Configuration and Balanced Detection

Kim

Leaird

Metcalf

et al. 2014

J. Lightwave Technol.

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We demonstrate a novel technique to improve radio frequency (RF) performance such as RF gain and noise figure (NF) for comb-based RF photonic filters. While conventional RF photonic links use a dual-output modulator and balanced detection, this RF photonic filter utilizes an interferometric configuration with double sideband suppressed carrier modulation and balanced detection. This technique can simultaneously provide filter tunability, 6-dB RF gain increase, and noise cancellation. The RF gain and NF of the RF photonic filter are improved to approximately 0 and 24 dB, respectively. With the improved RF performance, we perform the tuning of the filter center frequencies from 2 to 8 GHz with no baseband filter response (<−38 dB), no RF power fading, while maintaining good filter shape (sidelobe suppression and stopband attenuation >32 dB).

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Section: Simulationmentioning

confidence: 99%