  The von-Neumann bottleneck has constrained computing systems from efficiently
operating on the increasingly large demand in data from networks and devices.
Silicon (Si) photonics offers a powerful solution for this issue by providing a
platform for high-bandwidth, energy-efficient interconnects. Furthermore,
memristors have emerged as a fundamental building block for non-volatile data
storage and novel computing architectures with powerful in-memory processing
capabilities. In this paper, we integrate an Al2O3 memristor into a
heterogeneous Si quantum dot microring laser to demonstrate the first laser
with non-volatile optical memory. The memristor alters the effective optical
modal index of the microring laser cavity by the plasma dispersion effect in
the high resistance state (HRS) or Joule heating in the low resistance state
(LRS), subsequently controlling the output wavelength of the laser in a
non-volatile manner. This device enables a novel pathway for future
optoelectronic neuromorphic computers and optical memory chips.
