Physics – Optics
Scientific paper
2011-05-04
Physics
Optics
29 pages, 5 figures
Scientific paper
Photonic technologies have received considerable attention for enhancement of radio-frequency (RF) electrical systems, including high-frequency analog signal transmission, control of phased arrays, analog-to-digital conversion, and signal processing. Although the potential of radio-frequency photonics for implementation of tunable electrical filters over broad RF bandwidths has been much discussed, realization of programmable filters with highly selective filter lineshapes has faced significant challenges. In this paper we show that a new approach based on optical frequency combs enables dramatic progress. A novel comb generation scheme employing tailored electro-optic modulation and cascaded four-wave mixing results in approximately Gaussian RF filter lineshapes with extremely high (>60 dB) out-of-band suppression. A modification of our approach provides RF filter tuning through optical delay variation and decouples filter tuning and lineshape control. By exploiting a dual-comb scheme, the optical delay and RF passband frequency are switched with unprecedented (~40 ns) speed.
Ferdous Fahmida
Hamidi Ehsan
Leaird Daniel E.
Long Christopher M.
Supradeepa V. R.
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