Dynamic compensation of two-photon absorption induced distortions in silicon photonics filters

Here we show that in coupled-resonator devices the main impairment carried by TPA-induced thermal effects is the intensity-dependent shift of the resonant wavelengths, resulting not in a rigid red-shift of the spectral response, but in a resonance spread disrupting the frequency and time behaviour of the device. We also demonstrate that an active thermal control of the individual resonators is a viable strategy to adaptively compensate for the intensity-dependent resonance spread, responsible for dramatic cross-talk increase in WDM filters. The presented approach has general validity and can be extended to other interferometric silicon photonics devices operating in both linear and nonlinear regime.