Abstract

This study investigates the survivable traffic grooming problem for elastic optical networks with flexible spectrum grid employing new transmission technologies. In such networks, instead of following the traditional fixed ITU-T wavelength grid, optical transponders are capable of properly tuning their rates, and consequently their spectrum occupation, by introducing the fine-granular spectrum unit, called a frequency slot. The number of contiguous frequency slots allocated to an optical path (i.e., lightpath) is adjusted to the current network flow. In this study, we propose a novel shared protection specific to elastic networks, namely, elastic separate-protection-at-connection (ESPAC). It not only provides traditional backup sharing, but also offers a new opportunity of spectrum sharing enabled by the elasticity of the transponders: 1) if the working paths of two connections are link disjoint physically, and 2) if their backup paths traverse two lightpaths which are adjacent on a fiber link, then the two backup lightpaths can share spectrum. The new opportunity of spectrum sharing is realized by using First-Fit to assign working traffic and Last-Fit to assign backup traffic, and allowing spectrum overlap between adjacent backup wavelengths. The elasticity of the transponder enables the expansion and contraction of the lightpaths, thus when a single failure occurs in the network, lightpaths carrying backup flows can be tuned to appropriate rates in such a way that the overlap spectrum is used by only one of the adjacent lightpaths. The results show ESPAC is very spectrum efficient in elastic network setting.

© 2012 IEEE

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  1. M. Jinno, "Spectrum-efficient and scalable elastic optical path network: Architecture, benefits, and enabling technologies," IEEE Commun. Mag. 47, 66-73 (2009).
  2. K. Christodoulopoulos, "Value analysis methodology for flexible optical networks," Proc., ECOC 2011 pp. 1-3.
  3. S. Zhang, B. Mukherjee, "Energy efficient dynamic provisioning for spectrum elastic optical networks," Proc., ICC 2012 pp. 3013-3035.
  4. P. Wright, A. Lord, S. Nicholas, "Comparison of optical spectrum utilization between flexgrid and fixed grid on a real network topology," Proc., OFC/NFOEC 2012 .
  5. M. Eiselt, "Programmable modulation for high-capacity networks," Proc., ECOC 2011 pp. 771-772.
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  7. L. Velasco, "Elastic spectrum allocation for variable traffic in flexible-grid optical networks," Proc., OFC/NFOEC 2012 .
  8. A. Eira, J. Pedro, J. Pires, "Optimized design of shared restoration in flexible-grid transparent optical networks," Proc., OFC/NFOEC 2012 .
  9. X. Shao, "Shared-path protection in OFDM-based optical networks with elastic bandwidth allocation," Proc., OFC/NFOEC 2012 .
  10. A. N. Patel, "Survivable transparent flexible optical WDM (FWDM) networks," Proc., OFC/NFOEC 2011 .
  11. Y. Sone, "Bandwidth squeezed restoration in spectrum-sliced elastic optical path networks (SLICE)," IEEE/OSA J. Opt. Commun. Netw. 3, 223-233 (2011).
  12. K. Christodoulopoulos, I. Tomkos, E. A. Varvarigos, "Elastic bandwidth allocation in flexible OFDM-based optical networks," J. Lightw. Technol. 29, 1354-1366 (2011).
  13. K. Zhu, B. Mukherjee, "Traffic grooming in an optical WDM mesh network," IEEE J. Sel. Areas Commun. 20, 122-133 (2002).
  14. Y. Zhang, "Traffic grooming in spectrum-elastic optical path networks," Proc., OFC/NFOEC 2011 .
  15. G. Zhang, M. D. Leenheer, B. Mukherjee, "Optical grooming in OFDM-based elastic optical networks," Proc., OFC/NFOEC 2012 .
  16. C. Ou, "Traffic grooming for survivable WDM networks-shared protection," IEEE J. Sel. Areas Commun. 21, 1367-1383 (2003).
  17. H. Zhu, H. Zang, K. Zhu, B. Mukherjee, "A novel generic graph model for traffic grooming in heterogeneous WDM mesh networks," IEEE/ACM Trans. Netw. 11, 285-299 (2003).

2011 (2)

Y. Sone, "Bandwidth squeezed restoration in spectrum-sliced elastic optical path networks (SLICE)," IEEE/OSA J. Opt. Commun. Netw. 3, 223-233 (2011).

K. Christodoulopoulos, I. Tomkos, E. A. Varvarigos, "Elastic bandwidth allocation in flexible OFDM-based optical networks," J. Lightw. Technol. 29, 1354-1366 (2011).

2009 (1)

M. Jinno, "Spectrum-efficient and scalable elastic optical path network: Architecture, benefits, and enabling technologies," IEEE Commun. Mag. 47, 66-73 (2009).

2003 (2)

C. Ou, "Traffic grooming for survivable WDM networks-shared protection," IEEE J. Sel. Areas Commun. 21, 1367-1383 (2003).

H. Zhu, H. Zang, K. Zhu, B. Mukherjee, "A novel generic graph model for traffic grooming in heterogeneous WDM mesh networks," IEEE/ACM Trans. Netw. 11, 285-299 (2003).

2002 (1)

K. Zhu, B. Mukherjee, "Traffic grooming in an optical WDM mesh network," IEEE J. Sel. Areas Commun. 20, 122-133 (2002).

IEEE J. Sel. Areas Commun. (1)

C. Ou, "Traffic grooming for survivable WDM networks-shared protection," IEEE J. Sel. Areas Commun. 21, 1367-1383 (2003).

IEEE Commun. Mag. (1)

M. Jinno, "Spectrum-efficient and scalable elastic optical path network: Architecture, benefits, and enabling technologies," IEEE Commun. Mag. 47, 66-73 (2009).

IEEE J. Sel. Areas Commun. (1)

K. Zhu, B. Mukherjee, "Traffic grooming in an optical WDM mesh network," IEEE J. Sel. Areas Commun. 20, 122-133 (2002).

IEEE/ACM Trans. Netw. (1)

H. Zhu, H. Zang, K. Zhu, B. Mukherjee, "A novel generic graph model for traffic grooming in heterogeneous WDM mesh networks," IEEE/ACM Trans. Netw. 11, 285-299 (2003).

IEEE/OSA J. Opt. Commun. Netw. (1)

Y. Sone, "Bandwidth squeezed restoration in spectrum-sliced elastic optical path networks (SLICE)," IEEE/OSA J. Opt. Commun. Netw. 3, 223-233 (2011).

J. Lightw. Technol. (1)

K. Christodoulopoulos, I. Tomkos, E. A. Varvarigos, "Elastic bandwidth allocation in flexible OFDM-based optical networks," J. Lightw. Technol. 29, 1354-1366 (2011).

Other (11)

Y. Zhang, "Traffic grooming in spectrum-elastic optical path networks," Proc., OFC/NFOEC 2011 .

G. Zhang, M. D. Leenheer, B. Mukherjee, "Optical grooming in OFDM-based elastic optical networks," Proc., OFC/NFOEC 2012 .

K. Christodoulopoulos, "Value analysis methodology for flexible optical networks," Proc., ECOC 2011 pp. 1-3.

S. Zhang, B. Mukherjee, "Energy efficient dynamic provisioning for spectrum elastic optical networks," Proc., ICC 2012 pp. 3013-3035.

P. Wright, A. Lord, S. Nicholas, "Comparison of optical spectrum utilization between flexgrid and fixed grid on a real network topology," Proc., OFC/NFOEC 2012 .

M. Eiselt, "Programmable modulation for high-capacity networks," Proc., ECOC 2011 pp. 771-772.

B. Kozicki, H. Takara, K. Yonenaga, M. Jinno, "Efficient elastic optical path network for transmission beyond 100G," Proc., SPIE, 2011 pp. 79590K-79590K-9.

L. Velasco, "Elastic spectrum allocation for variable traffic in flexible-grid optical networks," Proc., OFC/NFOEC 2012 .

A. Eira, J. Pedro, J. Pires, "Optimized design of shared restoration in flexible-grid transparent optical networks," Proc., OFC/NFOEC 2012 .

X. Shao, "Shared-path protection in OFDM-based optical networks with elastic bandwidth allocation," Proc., OFC/NFOEC 2012 .

A. N. Patel, "Survivable transparent flexible optical WDM (FWDM) networks," Proc., OFC/NFOEC 2011 .

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