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Journal of Information Science and Engineering, Vol. 25 No. 3, pp. 733-745 (May 2009)

The Multiple Path Protection of DWDM Backbone Optical Networks*

Wen-Ping Chen, Fu-Hung Shih and Wen-Shyang Hwang
Department of Electrical Engineering
National Kaohsiung University of Applied Sciences
Kaohsiung, 807 Taiwan

Primary transmission protection technology is based on the characteristics of SONET/SDH protection mechanism which provides two fiber path rings. A serious problem may arise in the architecture when two fiber links are simultaneously broken. Mesh protection networks can support many protection paths to address above issue, but the key components of optical cross-connect (OXC) or photonic cross-connect (PXC) are expensive for network providers. Therefore, this study proposes a novel protection mechanism with a low-cost equipment of optical protection switching (OPS) for building a multiple path protection architecture on DWDM backbone network. The proposed mechanism is named the double 8-type OPS back to back protection mechanism. It can support eight protection paths to improve the issues of the low-path 1 + 1 dedicated ring and expensive mesh protection networks. This experiment demonstrates the automatic protection switching (APS) simulation tool, and the proposed mechanism could satisfy all demands of protection standard (e.g., the protection switching within 50 ms).

Keywords: OPS, DWDM, multiple-path protection, SONET/SDH, ring network

Full Text () Retrieve PDF document (200905_05.pdf)

Received February 1, 2008; accepted November 28, 2008.
Communicated by Yau-Hwang Kuo, Pau-Choo Chung and Jar-Ferr Yang.
* This research was supported by the National Science Council of Taiwan, R.O.C. project No. NSC 96-2221- E-151-029.