Transport protocols for optical burst switched networks - Moving beyond lightpaths
Bragg, A., Bryant, S., Hurst, B., Thorpe, S., & Stevenson, D. (2004). Transport protocols for optical burst switched networks - Moving beyond lightpaths. In Second International Workshop on Protocols for Fast Long-Distance Networks, PFLDnet 2004. Argonne, IL. 16-17 Feb 2004 http://web.archive.org/web/20110902183406/http://www-didc.lbl.gov/PFLDnet2004/papers/Bragg.pdf
Long distance gigabit networks are routinely used to transfer terabyte files using a variety of high performance transport protocols. Several recent bulk transfer experiments have demonstrated throughputs in excess of 90% of NIC transfer rates. Some experiments have used end-to-end “lightpaths” – provisioned, dedicated, point-to-point optical circuits.
Dedicated lightpaths have a number of advantages – most are protocol agnostic, many can be implemented as relatively inexpensive overlays in carrier networks, and some can be provisioned by users . However, lightpaths have several technological limitations: (i) scalability – lightpaths are point to point, and users have a few tens of wavelengths (at most) available to them even in DWDM networks; (ii) efficiency – lightpaths reserve but rarely use all of the bandwidth available to them. Most lightpath architectures cannot share wavelengths.