Giant backward Brillouin interaction in generic InP integrated photonics

Abstract

We report the first measurement of backward stimulated Brillouin scattering (SBS) in generic InP waveguides, supporting enhanced Brillouin gain of $g_B/Q_m=3.5\pm 0.6{\text{W}}^{-1}{\text{m}}^{-1}$ mediated by weakly-guided pressure waves in InGaAsP. This leads to SBS gain coefficients as high as $737\pm 54{\text{W}}^{-1}{\text{m}}^{-1}$, observed in a mature, foundry-accessible photonic integration platform.

10 pages, 6 figures