Extending path computation element for lightpath restoration in wavelength-switched optical networks  

作　　者：侯连兴 陆月明 王俊华 纪越峰 华一强 

机构地区：[1]Key Laboratory of Information Photonics and Optical Communications,Ministry of Education,Beijing University of Posts and Telecommunications

出　　处：《Chinese Optics Letters》2010年第2期142-145,共4页中国光学快报（英文版）

基　　金：supported in part by the National"863"Program(No.2007AA01Z252);the National Natural Science Foundation of China(Nos.60772024 and 60711140087);the National"973"Program of China (No.2007CB310705);the Specialized Research Fund for the Doctoral Program of Higher Education of MOE (No.200800130001);the Program for Changjiang Scholars and Innovative Research Team(No.IRT0609);the International S&T Cooperation Program of China(No. 2006DFA11040);the New Century Excellent Talents in University(No.06-0090)

摘　　要：Current generalized multi-protocol label switching （GMPLS） standards do not include adequate models for wavelength-switched optical networks （WSON） in recovery mechanisms. In this letter, GMPLS/path computation element （PCE） extensions are applied for the restoration of the lightpaths disrupted by collision or optical impairment. A reserved deflection routing scheme is proposed to achieve fast restoration. It uses the expanded PCE component to compute and assign the backup paths for lightpath recovery. Numerical results demonstrate that this scheme is effective and low cost.Current generalized multi-protocol label switching （GMPLS） standards do not include adequate models for wavelength-switched optical networks （WSON） in recovery mechanisms. In this letter, GMPLS/path computation element （PCE） extensions are applied for the restoration of the lightpaths disrupted by collision or optical impairment. A reserved deflection routing scheme is proposed to achieve fast restoration. It uses the expanded PCE component to compute and assign the backup paths for lightpath recovery. Numerical results demonstrate that this scheme is effective and low cost.

关 键 词：Computer system recovery Numerical analysis Optical materials RESTORATION Routing protocols Switching circuits 

分 类 号：TN929.11[电子电信—通信与信息系统]