Abstract
This paper analyzes the scalability in arrayed waveguide grating router (AWGR)-based
interconnect architectures and demonstrates active AWGR-based switching using a distributed
control plane. First, the paper analyses an all-to-all single AWGR passive interconnection with
$N$
nodes and proposes a new architecture that overcomes the scalability limitation
given by wavelength registration and crosstalk, by introducing multiples of smaller AWGRs
$(W$
×
$W)$
operating on a fewer number of wavelengths
$(W < N)$
. Second, this paper demonstrates active AWGR switching with a distributed
control plane, to be used when the size of the interconnection network makes the all-to-all
approach using passive AWGRs impractical. In particular, an active AWGR-based TONAK switch is
introduced. TONAK combines an all-optical NACK technique, which removes the need for electrical
buffers at the switch input/output ports, and a TOKEN technique, which enables a distributed
all-optical arbiter to handle packet contention. The experimental validation and performance study
of the AWGR-based TONAK switch is presented, demonstrating the feasibility of the TONAK solution
and the high throughput and low average packet latency for an up to 75% offered load.
© 2013 IEEE
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