Asynchronous optical packet switching is presented as an alternative to current core electronic routers used for high-speed Internet traffic. Current core Internet routers process all information electrically at the bit-level. As bandwidth and capacity increases, the need for higher speed electronics leads to increases in power consumption and footprint. In label swapped optical packet switching, forwarding information and data are separated into low bit-rate optical labels and high bit-rate optical payloads. This allows for the use of low frequency electronics for processing label information while transparently forwarding high bit-rate payloads optically at low switching speeds. The use of low speed electronics and further integration of photonic devices could reduce power and footprint limitations of scaling high capacity core data routers.
Asynchronous operation of routers is the key to scaling large networks where multiple independent nodes are used, each with their own packet and bit-level clock sources. Prior to this work, there has been little published on asynchronous optical packet switching. Asynchronous operation causes inherent timing uncertainties on the clock and packet-level due to the frequency drift between plesiochronous clocks. These uncertainties create unique challenges to optical technologies and architectures.
In this work, the first asynchronous optical packet router is demonstrated. The architecture and optical technologies of the router are discussed and performance measurements presented. The impact of the performance of the optical technologies used in the router is a key aspect of this work. Synchronization, buffering, and forwarding of asynchronous optical packets are performed using photonic integrated technologies. Optical packet synchronizers are used to dynamically align incoming packets to local timeslots for efficient buffering and switching. Multiple optical buffers based on integrated InP technology are used to resolve contention of packets destined for the same port at the same time. Forwarding of optical packets is done through the use of monolithically integrated field-based packet forwarding chips to route packets to different ports. Finally, time and wavelength division multiplexed asynchronous optical packets originating from multiple independent sources are detected and analyzed on a per packet basis using a custom burst mode receiver.
|Advisor:||Blumenthal, Daniel J.|
|Commitee:||Bergman, Keren, Bowers, John E., Coldren, Larry A.|
|School:||University of California, Santa Barbara|
|Department:||Electrical & Computer Engineering|
|School Location:||United States -- California|
|Source:||DAI-B 70/09, Dissertation Abstracts International|
|Keywords:||Optical buffers, Optical communications, Optical packet routers, Optical packet switching, Semiconductor optical amplifiers, Synchronization, Wavelength converters|
Copyright in each Dissertation and Thesis is retained by the author. All Rights Reserved
The supplemental file or files you are about to download were provided to ProQuest by the author as part of a
dissertation or thesis. The supplemental files are provided "AS IS" without warranty. ProQuest is not responsible for the
content, format or impact on the supplemental file(s) on our system. in some cases, the file type may be unknown or
may be a .exe file. We recommend caution as you open such files.
Copyright of the original materials contained in the supplemental file is retained by the author and your access to the
supplemental files is subject to the ProQuest Terms and Conditions of use.
Depending on the size of the file(s) you are downloading, the system may take some time to download them. Please be