  A data center (DC) is one of the main building blocks of modern information
technology. Any intra DC network should strive to achieve high throughput,
while continuing to be flexible in responding to changing traffic patterns.
Optical wireless communication links on top of the fiber/wire infrastructure
could offer flexible and dynamic reconfiguration of the network. In this paper
we present the design of an optical wireless communication orbital angular
momentum (OAM) receiver with detector array. The proposed receiver is described
in detail, a numerical example is given, and alternate options for its
construction are explored. For a given set of parameters we found that a three
ring detector with optimized ring area is comparable to seven ring evenly
spaced detector.
