A survivable colorless wavelength division multiplexed passive optical network with centrally controlled intelligent protection scheme.
Date of Issue2012
School of Electrical and Electronic Engineering
Several protection schemes have been proposed for wavelength division multiplexed passive optical networks (WDM-PONs). However, these existing schemes only work under the assumption that all the optical network units (ONUs) and the optical light terminal (OLT) continuously transmit optical signals. In practice, some ONUs may be in sleep mode to save power consumption or may be shut down whenever users are offline. Under such scenarios, the existing schemes would not work. To deal with more practical operation scenarios, we propose a centrally controlled intelligent protection scheme for survivable WDM-PONs, whereby the optical power on both the working and protection paths is monitored simultaneously, and the monitored results are fed to a novel logical decision unit which performs the protection switching. It provides 1:1 downstream protection and 1+1 upstream protection capabilities. The logic decision unit in conjunction with a power monitoring unit is implemented in the OLT to enable intelligent protection switching in more practical operation scenarios. Moreover, our proposed protection scheme can tell the connection status of every fiber path (working and protection), thus facilitating a faster failure recovery. The scheme feasibility is experimentally verified with 10 Gb/s downstream and 1.25 Gb/s upstream transmissions. The network performances in terms of complexity and availability are also evaluated.
DRNTU::Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics
Journal of optical communications and networking
© 2012 OSA. This paper was published in Journal of Optical Communications and Networking and is made available as an electronic reprint (preprint) with permission of OSA. The paper can be found at the following official DOI: [http://dx.doi.org/10.1364/JOCN.4.000741]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.