Reconfigurable Free-Space Optical Interconnects

Abstract

Free-space optical interconnects can support many low-data-rate channels while avoiding the cost, energy consumption, and packaging constraints of optical waveguide- or fiber-based systems that are widely used today. We propose a free-space optical interconnect system based on reconfigurable micromirror arrays, and show that it scales favorably due to its two-dimensional scaling. We discuss the channel count scaling model, compare our demonstration with theory, and project a channel count above 10,000 to achieve 100 Tbps with slow channels (e.g., <10 Gbps). In a proof-of-concept system with a piston-motion micromirror array, we demonstrate nine channels that are simultaneously optimized. The optimization enables -21.7 dB of average worst-case crosstalk for a channel pitch equal to twice the beam radius, a smaller channel spacing than that required in flat tip-tilt mirrors. The optimization flow is further investigated for different channel spacings, simultaneous illumination, and different numbers of outputs, which generally achieve smaller worst-case crosstalk than the flat tip-tilt mirror case. Overall, the work demonstrates the advantage of piston-motion micromirrors in the proposed optical interconnects.