Comb-based radio frequency photonic filtering: Principles, applications and opportunities

Rui Wu, Purdue University

Abstract

Photonic technologies have received tremendous attention for enhancement of radio-frequency (RF) systems, including control of phased arrays, analog-to-digital conversion, high-frequency analog signal transmission, and RF signal processing. Among the various applications, implementation of tunable electrical filters over broad RF bandwidths has been much discussed. However, realization of programmable filters with highly selective filter lineshapes, fast RF bandwidth reconfiguration and rapid passband frequency tunability has faced significant challenges. Phase modulated continuous-wave laser frequency combs have seen wide use in various applications such as wavelength division multiplexing networks, optical arbitrary waveform generation, and agile arbitrary millimeter wave generation. Using an optical frequency comb as a multiple carrier optical source offers new potential for achieving complex and tunable RF photonic filters. In this dissertation, I discuss about the generation and application of high-repetition-rate (10 GHz) electro-optic modulated optical frequency combs for our breakthroughs in implementing programmable RF photonic filters with highly selective filter lineshapes (>60 dB mainlobe-to-sidelobe suppression ratio), fast RF bandwidth reconfiguration (∼20 ns reconfiguration speed) and rapid RF passband frequency tunability (∼40 ns tuning speed).

Degree

Ph.D.

Advisors

Weiner, Purdue University.

Subject Area

Electrical engineering|Optics

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