Abstract
Wavelength-striped optical packet multicasting comprises a potentially
important functionality for future energy-efficient network applications.
We report on two multicast-capable architectures to experimentally demonstrate
multiwavelength packet multicasting in an optical switching fabric testbed.
The first design uses programmable packet-splitter-and-delivery that simultaneously
supports the nonblocking unicast, multicast, and broadcast of high-bandwidth
optical packets with parallel switches. This realization achieves the error-free
multicasting of optical messages with 8 × 10 Gb/s payloads, with confirmed
bit-error rates less than 10<sup>-12</sup>, and scalability of per-channel data rates to 40 Gb/s. We then
introduce a second multistage multicasting architecture with lower hardware
and energy costs, with the design trade-off of more complex routing logic;
the experimental demonstration shows the successful switching and error-free
multicasting of 8 × 10 Gb/s optical packets. The energy costs in terms of the capital
and operational expenditures are then compared for the two designs, showing
the benefits of the second multicast architecture.
© 2012 IEEE
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