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Data centers based on Passive Optical Networks (PONs) can provide highcapacity, low cost, scalability, elasticity and high energy-efficiency. Thispaper introduces the use of WDM-TDM multiple access in a PON-based data centerthat offers multipath routing via two-tier cascaded Arrayed Waveguide GratingRouters (AWGRs) to improve the utilization of resources. A Mixed Integer LinearProgramming (MILP) model is developed to optimize resource allocation whileconsidering multipath routing. The results show that all-to-all connectivity isachieved in the architecture through the use of two different wavelength withindifferent time slots for the communication between racks in the same ordifferent cells, as well as with the OLT switches.

WDM/TDM over Passive Optical Networks with Cascaded-AWGRs for Data Centers