Giant enhancement of stimulated Brillouin scattering with engineered phoxonic crystal waveguides
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AbstractStimulated Brillouin scattering (SBS) is a third-order nonlinear process that involves the interaction of two light fields and an acoustic wave in a medium. It has been exploited for applications of optical communication, sensing, and signal processing. This effect, originally demonstrated in long optical fibers, has recently been realized in silicon waveguides on a chip-scale integrated platform. However, due to the weak per-unit-length SBS gain, the length of the silicon waveguides is usually several centimeters, which prevents device miniaturization for high-density integration. Here, we engineer a phoxonic crystal waveguide structure to achieve significantly enhanced SBS gain in the entire C band, by taking advantage of its simultaneous confinement of slow propagating optical and acoustic waves. The resulting SBS gain coefficient is greater than 3 × 104 W−1 m−1 in the wavelength range of 1520–1565 nm with the highest value beyond 106 W−1 m−1, which is at least an order of magnitude higher than the existing demonstrations. This giant enhancement of SBS gain enables ultracompact and high-performance SBS-based integrated optoelectronic devices such as Brillouin lasers, amplifiers, and signal processors.
All Author(s) ListZejie Yu, Xiankai Sun
Journal nameOptics Express
Year2018
Month1
Day22
Volume Number26
Issue Number2
Pages1255 - 1267
ISSN1094-4087
LanguagesEnglish-United States

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