<title>Optical link for an adaptive redundant free-space interconnect</title>

Abstract

Board to board free-space optical interconnects can deliver high bandwidth with no physical contact but suffer from poor tolerances to misalignment. In order to obtain high misalignment tolerances, we propose the use of an active alignment scheme in conjunction with an optimized optical design. The active alignment scheme uses a redundant set of optical links and the active selection ofthe best link. The optical design maximizes the alignment tolerances between the two boards.

Point to point VCSEL-based free space optical data link for board-to-board communications

“…Several publications propose spatial redundancy to release the positioning constraint. For instance, several papers propose to increase the number of possible optical links and to use the most reliable one to implement the link 1,2,5,7 . In this publication, we rather consider optical power increase to maximize the positioning tolerance within the optical interconnect.…”