Abstract
As data traffic increases exponentially in the Internet, a need of
deploying ATM switches or IP routers with terabit/s capacity is emerging. By
taking advantage of the advanced wavelength division multiplexing (WDM)
technology, we propose a nonblocking WDM-based optical interconnection network
(OIN) to interconnect multiple electronic router modules (RMs), where packets
are stored and processed. The proposed architecture uses an input-output
buffering scheme, where the OIN operates at twice the line rates to alleviate
the head-of-line blocking and thus achieves close to 100% throughput. The OIN
is capable of performing multicasting using the method of broadcast and
select. Output port contention among the input packets is resolved by a novel
ping-pong arbitration (PPA) scheme. For a 256-input packet switch, the
arbitration can be completed within 11 gates delay, less than 5 ns using the
current CMOS technology. We analyze the complexity of the OIN in optical
components and interconnections,its power budget, and crosstalk caused by the
finite ON-OFF ratio of optical switching gates. Bit error rates with respect
to different ON-OFF ratios and extinction ratios are evaluated by simulations.
The result shows that it is feasible to construct a 256 x 256 OIN with
existing technology.
© 2000 IEEE
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