Abstract
Short-range parallel optical interconnect between integrated circuits
can alleviate bandwidth, power, and packaging density issues that are associated
with low-latency high-bandwidth input–output over electrical interconnect.
In this paper, we evaluate the option of using true source-synchronous signaling
over optical interconnect with a large number of channels, reducing the substantial
per-channel clock synchronization circuitry to one instance. We also look
into dc-unbalanced signaling to remove the need for data coding. Uniformity
across channels is key to the feasibility of such an approach. An actual 64-channel
parallel optical interconnect setup at 1.25 Gb/s/channel is examined, and
models for the performance and uniformity of the different constituent parts
of the interconnect are drawn up. Major attention is given to the statistical
modeling of the coupling efficiency between a vertical cavity surface emitting
laser array and a multifiber connector. Although derived in the context of
a uniformity study, the stochastic models and the modeling approach are valuable
in their own right. In our case study, the usage of a common logic threshold
across all channels, which is required for dc-unbalanced signaling, appears
infeasible after all models are combined. Efficient true source-synchronous
signaling turns out to be within reach in carefully designed systems.
© 2008 IEEE
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