Abstract
Photonic network-on-chip (NoC) architectures are emerging as a new
paradigm to interconnect a large number of processing cores at chip level,
meeting the pressing demand for extremely high bandwidth and low power
consumption. Optical routers, which are typically composed of silicon
waveguides and optical switches, play a key role in an on-chip photonic
interconnection network. In this paper, we propose a micro-ring-resonator
(MRR)-based, scalable, and non-blocking passive optical router design,
namely the generic wavelength-routed optical router (GWOR). We first
introduce the four 4 × 4 GWOR router structures
and then show how to construct GWORs of larger sizes by using the proposed
4 × 4 GWORs as the primitive building blocks.
The number of MRRs used in the proposed GWOR is the least among the existing
passive router designs for the same network size. In addition, we show that
the power loss experienced on GWORs is lower than other comparative designs.
Furthermore, to improve the bandwidth and fault tolerance capability of the
GWORs, the redundant GWOR (RGWOR) structure is presented. RGWOR can provide
multiple routing paths between each pair of input-output ports by cascading
different types of GWORs.
© 2011 IEEE
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