Abstract

Systems that enable optical bypass, where traffic transiting a node can remain in the optical domain as opposed to undergoing costly optical-electronic-optical (O/E/O) conversion, are gradually being accepted in carrier networks. An important factor in determining the cost effectiveness of such systems is the optical reach, the distance an optical signal can travel before needing to be regenerated. Longer optical reach results in a smaller number of required regenerations and hence less equipment and lower operating costs. In order to achieve longer reach, however, more expensive equipment such as amplifiers and transponders is typically needed. As the optical reach continues to increase, the cost benefit provided by reduced regeneration is eventually offset by the more expensive system equipment, leading to a concave curve of total network cost versus optical reach. This paper describes the analysis of four representative North American long-haul networks over a range of assumptions to determine the optimal optical reach from a cost perspective. In such networks, an optical reach in the range of 2500-3500 km yields the minimum, or close to the minimum, total capital cost over a wide range of assumptions, while representing a good tradeoff between decreased operating costs and increased initial network cost.

© 2005 IEEE

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  12. B. Manseur and J. Leung, "Comparative analysis of network reliability and optical reach", presented at the Nat. Fiber Optic Engineers Conf. (NFOEC 2003), Orlando, FL, Sep. 7-11 , 2003.

Other

A. A. M. Saleh, "Transparent optical networking in backbone networks", presented at the Optical Fiber Communication Conf. (OFC 2000), Baltimore, MD, Paper ThD7, Mar. 5-10, 2000.

R. E. Wagner, et al. "The potential of optical layer networks", presented at the Optical Fiber Communication Conf. (OFC 2001), Anaheim, CA, Paper TuT3, Mar. 17-22, 2001.

A. A. M. Saleh, "Defining all-optical networking and assessing its benefits in metro, regional and backbone networks", presented at the Optical Fiber Communication Conf. (OFC 2003), Atlanta, GA, Paper WQ1, Mar. 23-28 , 2003.

A. F. Wallace, "Ultra long-haul DWDM: Network economics", presented at the Optical Fiber Communication Conf. (OFC 2001), Anaheim, CA, Paper TuT1, Mar. 17-22, 2001.

J. M. Simmons, "Economic and architectural benefits of hierarchical backbone networks", presented at the LEOS Summer Topicals, Aventura, FL, Jul. 24-28 , 2000.

I. Tomkos, et al. "Ultra-long-haul DWDM network with 320 x 320 wavelength-port 'Broadcast & Select' OXCs", presented at the Eur. Conf. Optical Communication (ECOC 2002), Copenhagen, Denmark,Sep. 8-12 , 2002.

A. Pratt, et al. "40 x 10.7 Gbit/s DWDM transmission over a meshed ULH network with dynamically reconfigurable optical crossconnects", presented at the Optical Fiber Communication Conf. (OFC 2003), Atlanta, GA, PD09, Mar. 23-28, 2003.

M. Fuller, "Analysts see hope for U.S. long-haul", Lightw. Eur. Mag., vol. 2, no. 6, p. 63, Jun. 2003.

W. Van Parys, et al. "Quantifying the benefits of selective wavelength regeneration in ultra long-haul WDM networks", presented at the Optical Fiber Communication Conf. (OFC 2001), Anaheim, CA, Paper TuT4, Mar. 19-22 , 2001.

S. Subramaniam, M. Azizoglu and A. K. Somani, "All-optical networks with sparse wavelength conversion", IEEE/ACM Trans. Netw., vol. 4, no. 4, pp. 544-557, Aug. 1996.

J. M. Simmons, "Analysis of wavelength conversion in all-optical express backbone networks", presented at the Optical Fiber Communication Conf. (OFC 2002), Anaheim, CA, Paper TuG2, Mar. 17-22, 2002.

B. Manseur and J. Leung, "Comparative analysis of network reliability and optical reach", presented at the Nat. Fiber Optic Engineers Conf. (NFOEC 2003), Orlando, FL, Sep. 7-11 , 2003.

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