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

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 configur...

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Bibliographic Details
Published inJournal of lightwave technology Vol. 32; no. 20; pp. 3478 - 3488
Main Authors Hyoung-Jun Kim, Leaird, Daniel E., Metcalf, Andrew J., Weiner, Andrew M.
Format Journal Article
LanguageEnglish
Published New York IEEE 15.10.2014
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Finite impulse response filters
Gain
Noise
Optical fiber filters
Optical interferometry
Radio frequency
tunable filters
microwave photonics
Finite impulse response filters
programmable filters
optical processing
optical combs
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Summary: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).
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2014.2326410