Abstract
A hybrid electro-optic router is attractive, where packet buffering and
table lookup are carried out in electrical domain and switching is done
optically. In this paper, we propose a load-balanced optical switch (LBOS)
fabric for a hybrid router. LBOS comprises $N$ linecards connected by an $N$-wavelength WDM fiber ring. Each linecard $i$ is configured to receive on channel $\lambda$$_{i}$. To send a packet, it can select and transmit on an idle channel
based on where the packet goes. The packet remains in the optical domain all
the way from input linecard to output linecard. Meanwhile, the loading in
the ring network is perfectly balanced by spreading the packets for
different destinations to use different wavelengths, and the packets for the
same destination to use different time slots. With the pipelined operation
of the LBOS, we show that LBOS can yield close-to-100% throughput
performance. To address the ring-fairness problem under the inadmissible
traffic patterns, an efficient throughput-fair scheduler is devised. To
efficiently support multicast traffic, a simple multicast scheduler is also
proposed. Finally, the linecard placement problem is investigated for
further cutting down the average packet delay.
© 2010 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription