Abstract
We present, characterize, and demonstrate a simple, and novel, continuous-time band-folding microwave photonic link. Implemented with a single dual-drive Mach-Zehnder modulator (DDMZM) acting as 2 parallel phase modulators, the link effects an 8:1 bandwidth folding to enable direct sampling and digitization of an entire band. Two microwave tones modulated on one arm along with their 3rd-order intermodulation (IMD) products serve as the spectral comb that exists only in the desired band, and the microwave spectrum of interest (SOI) is modulated onto the other arm. Parallel implementation adds, rather than multiplies, the tone and signal together, eliminating many cross-modulation products and spurs that would otherwise complicate and limit the foldable bandwidth. The link can operate with no optical filters if biased or with no bias if an optical bandpass filter is used.
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