Analysis of Optical Channel Crosstalk for Free-Space Optical Interconnects in the Presence of Higher Order Transverse Modes

摘要

We analyse the effect of crosstalk noise on the performance of free space optical interconnects (FSOIs). In addition to u27diffraction-causedu27 crosstalk, we consider the effect of u27stray-lightu27 crosstalk noise which, to the best of our knowledge, has not been addressed previously. Simulations were performed on a microlens based FSOI system using the modal composition and beam profiles experimentally extracted from a commercial Vertical-Cavity Surface-Emitting Laser. We demonstrate that this crosstalk noise introduces significant degradation to interconnect performance, particularly for multi-transverse mode laser sources. A simple behavioural model is also developed which accurately approximates the crosstalk noise for a range of optical sources and interconnect configurations.