Minimising Crosstalk in MicroChannel Free-Space Optical Interconnects with the Presence of Higher Order Modes

摘要

We investigate the combined effect of the diffraction-caused crosstalk noise (DCCN) and the stray-light crosstalk noise (SLCN) on the performance of FSOI system. A numerical simulator was employed in this study to investigate OI channel design. We determine that there exists an optimal focal length, which maximises the signal-to-noise ratio (SNR) by minimising the combined effects of DCCN and SLCN. For the fundamental mode, the optimal focal length is approximately 750μm; for both LG_(01) and LG_(10) modes, the optimal focal length occurs between f = 650 μm and f = 700 μm, depending on the interconnection distance and array pitch.