Dr. Angela L. Chiu Profile

Dr. Angela L. Chiu

Senior Research Staff

SPIE Involvement:

Author

Publications (2)

Proceedings Article | 9 December 2005 Paper

IP over optical layer restoration: architecture, design, and analysis

Angela Chiu, John Strand

Proceedings Volume 6021, 60212E (2005) https://doi.org/10.1117/12.636787

KEYWORDS: Interfaces, Computer architecture, Optical networks, Wavelength division multiplexing, Integrated optics, Dense wavelength division multiplexing, Failure analysis, Network architectures, Optical filters, Switches

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Optical layer capacity and unit cost improvements are basic to the rapid growth of IP networks. However, the new rapid reconfiguration and restoration capabilities of the optical layer have been sparingly utilized by IP network operators. This is consistent with the economics: the widely deployed optical layer architecture based on a "discrete" optical crossconnect (DOXC - one not integrated into the WDM) incurs heavy interface costs. In addition, there are architectural and control issues which are roadblocks to IP exploitation of rapid optical layer agility. In the first part of the paper, we describe a next generation all-optical architecture based on OXCs integrated with the WDM ("IOXCs"), and one instantiation of this architecture using a class of reconfigurable degree-N optical add-drop multiplexer (OADM). A new shared mesh restoration mechanism based on hot standbys is designed to overcome slow convergence and transient behaviors that are typical in all-optical networks. A series of economic comparisons are made on both a 120-node hypothetical national network and a smaller express backbone network to demonstrate the cost effectiveness of the new IOXC-based restoration in comparison to the IP layer restoration after some optical layer failure that results in one or more IP link failures. In the IP over Optical architecture, the Optical Layer can provide its IP clients rapid and efficient restoration for IP link failures that are due to some optical layer failure; however its inability to protect against router and router interface failures erodes its attractiveness. In the second part of the paper, we propose a joint IP/Optical restoration mechanism to deal with this. It is suitable for IP offices with at least two backbone routers and an optical cross-connect. The OXC is used to re-terminate OC-48/OC-192 links from a failed backbone router to its mate. The entire interoffice portion of the re-terminated link is reused, thus minimizing the amount of additional inter-office capacity required to protect against router failures. The proposed scheme is also applicable to restoration for router interface failures as well as to cases with single backbone router office architecture.

Proceedings Article | 5 November 1999 Paper

Current status on quality of service in IP

Angela Chiu

Proceedings Volume 3842, (1999) https://doi.org/10.1117/12.368318

KEYWORDS: Switches, Internet, Asynchronous transfer mode, Switching, Clouds, Forward error correction, Copper, Video, Integrated modeling, Virtual colonoscopy

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Proceedings Volume Editor (1)

SPIE Conference Volume | 2 February 2001

Internet Quality and Performance and Control of Network Systems

Conference Committee Involvement (1)

Internet, Performance and Control of Network Systems

6 November 2000 | Boston, MA, United States

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