Share Email Print

Proceedings Paper

Ultra-fast out-of-band 1+1 protection using a WDM backup channel and a tunable receiver
Author(s): Peigang Hu; Yikai Su; Xiangqing Tian; Hao He; Weisheng Hu; Haigen Shen; Lilin Yi; Li Zhan
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

1+1 protection is usually used to implement fast failure recovery and provide high reliability to data connections. A typical scheme of 1+1 protection employs a primary working lightpath and a dedicated diversely-routed backup ligthpath to carry the same data, in which the same wavelengths are always used for the two lightpath, thus putting edge-disjoint restrictions on the wavelength routing. Because current standard requires <50-ms protection-switching time, a mechanical switches with several millisecond switching time can be used before the receiver for channel switching. However, with the transmission speed of single wavelength channel increasing to tens of Gb/s, a faster switching time is highly desired to reduce the amount of data loss. In this paper, we propose an out-of-band 1+1 protection scheme, which employs two different wavelengths for primary working lightpath and protection backup path, respectively. At the destination node, a fast tunable heterodyne-detection receiver is used to select the desired wavelength lightpath. The proposed fast tunable receiver significantly reduces the protection switching time between the two paths. To investigate the performance of the proposed protection scheme, a fast channel selection experiment is performed. Two optical wavelength channels were modulated simultaneously by a Mach-Zehnder (MZ) external modulator with data rate 1.25Gb/s. The tunable heterodyne receiver switches between the working lightpath and protection lightpath to demonstrate the capability of 1+1 protection. A <0.8-ns switching time is obtained which demonstrates the potential of hitless protection switching, if the switching occurs at the transition of two neighboring '1's.

Paper Details

Date Published: 5 December 2005
PDF: 8 pages
Proc. SPIE 6022, Network Architectures, Management, and Applications III, 602215 (5 December 2005); doi: 10.1117/12.636271
Show Author Affiliations
Peigang Hu, Shanghai Jiao Tong Univ. (China)
Yikai Su, Shanghai Jiao Tong Univ. (China)
Xiangqing Tian, Shanghai Jiao Tong Univ. (China)
Hao He, Shanghai Jiao Tong Univ. (China)
Weisheng Hu, Shanghai Jiao Tong Univ. (China)
Haigen Shen, Shanghai Jiao Tong Univ. (China)
Lilin Yi, Shanghai Jiao Tong Univ. (China)
Li Zhan, Shanghai Jiao Tong Univ. (China)

Published in SPIE Proceedings Vol. 6022:
Network Architectures, Management, and Applications III
Kwok-wai Cheung; Gee-Kung Chang; Guangcheng Li; Ken-Ichi Sato, Editor(s)

© SPIE. Terms of Use
Back to Top
Sign in to read the full article
Create a free SPIE account to get access to
premium articles and original research
Forgot your username?