Abstract
Free space optical interconnections (FSOIs) are anticipated to
become a prevalent technology for short-range high-speed communication.
FSOIs use lasers in board-to-board and rack-to-rack communication to
achieve improved performance in next generation servers and are expected
to help meet the growing demand for massive amounts of inter-card data
communication. An array of transmitters and receivers arranged to create
an optical bus for inter-card and card-to-backplane communication could be
the solution. However, both chip heating and cooling fans produce
temperature gradients and hot air flow that results in air turbulence
inside the server, which induces signal fading and, hence, influences the
communication performance. In addition, the proximity between neighboring
transmitters and receivers in the array leads to crosstalk in the received
signal, which further contributes to signal degradation. In this Letter,
the primary objective is to experimentally examine the off-axis crosstalk
between links in the presence of turbulence inside a server chassis. The
effects of geometrical and inter-chassis turbulence characteristics are
investigated and first-and second-order statistics are derived.
© 2016 Chinese Laser Press
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