Dr. Hui Zang Profile

Dr. Hui Zang

Principal Applied R & D Eng at Sprint Advanced Tech Labs

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Publications (4)

Proceedings Article | 19 November 2009 Paper

Towards a seamless hybrid communication system

Yinghua Ye, Hui Zang

Proceedings Volume 7633, 76330Z (2009) https://doi.org/10.1117/12.853007

KEYWORDS: Free space optics, Telecommunications, Interfaces, RF communications, Control systems, Algorithm development, Network architectures, Internet, Signal processing

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Proceedings Article | 9 September 2002 Paper

Methodologies on designing a hybrid shared-mesh-protected WDM network with sparse wavelength conversion and regeneration

Hui Zang, Renxiang Huang, James Pan

Proceedings Volume 4910, (2002) https://doi.org/10.1117/12.482439

KEYWORDS: Optical amplifiers, Switches, Wavelength division multiplexing, Signal attenuation, Fiber amplifiers, Wavelength division multiplexing networks, Optical networks, Optical fibers, Algorithm development, Raman spectroscopy

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Proceedings Article | 3 July 2002 Paper

Increasing link utilization in IP over WDM networks

Antonio Nucci, Nina Taft, Patrick Thiran, Hui Zang, Christophe Diot

Proceedings Volume 4874, (2002) https://doi.org/10.1117/12.475311

KEYWORDS: Wavelength division multiplexing, Interfaces, Internet, Failure analysis, Wavelength division multiplexing networks, Logic, Physics, Matrices, Receivers, Switches

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In this paper we study an approach to Quality of Service that offers end-users the choice between two classes of service defined according to their level of transmission protection. The first class of service, called Fully Protected (FP), offers end-users a guarantee of survivability in the case of a single failure; all FP traffic is protected using either a 1:1 or 1+1 protection scheme at the WDM layer. The second class of service, called Best-Effort Protected (BEP), is not protected; when a failure occurs, the network does the best it can by restoring at the IP layer only as much BEP traffic as possible. The FP service class mimics what Internet users receive today. The motivation of this approach is to increase the amount of bandwidth used on backbone networks by offering a lower quality of service that does not affect the current QoS provided by the network. We design an ILP model, for finding primary and backup paths at the optical layer, that incorporates a number of carriers' common practices. Namely we allow the FP demand to be specified via a traffic matrix at the IP layer, we include an overprovisioning factor that specifies the portion of each link that must be left unused, and we incorporate a minimal fairness requirement on how the BEP traffic is allocated. Our goal is thus to quantify how much BEP traffic can be carried in addition to the FP traffic, without impacting the protection quality of the FP traffic even in the case of failure, and without impacting the FP load. We show that by having two such classes of service, the load on a network can be increased by a factor of 4 to 7 (depending upon the network). Even if carriers want to overprovision their networks by 50%, we can still triple the total network load. We illustrate that the location of the bottleneck can affect whether or not we see a difference in performance between 1:1 or 1+1 protection schemes. Finally we evaluate the tradeoff between the two carrier requirements of overprovisioning and minimal f

Proceedings Article | 17 October 2001 Paper

Path-protection routing and wavelength assignment in WDM mesh networks under shared-risk-group constraints

Hui Zang, Canhui Ou, Biswanath Mukherjee

Proceedings Volume 4585, (2001) https://doi.org/10.1117/12.445211

KEYWORDS: Wavelength division multiplexing, Algorithm development, Optical networks, Earthquakes, Computer science, Wavelength division multiplexing networks, Computer programming, Binary data, Head

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