All-optical virtual private network in passive optical networks

We review recent progress on all-optical virtualprivate-network (VPN) schemes in passive optical networks (PONs). PON is a promising candidate in future access areas to provide broadband services with low cost. With all-optical virtual private network (VPN) function, PON can support efficient internetworking among end users with dedicated optical channels, thus enabling guaranteed bandwidth and enhanced security at the physical layer. Here, we discuss and compare existing schemes of all-optical VPNs in time-division-multiplexed (TDM) PONs, and also recently proposed schemes for deployment in wavelength-division-multiplexed (WDM) PONs and two-stage TDM/WDM PONs. OLT ONUA ONUB All-optical VPN ONUC Passive optical distributed netw ork © 2008 by WILEY-VCH Verlag GmbH & Co.KGaA, Weinheim All-optical virtual private network in passive optical networks Yikai Su 1,∗, Yue Tian , Elaine Wong , Nishaanthan Nadarajah , and Calvin C. K. Chan 3 1 State Key Lab of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiao Tong University, 800 Dongchuan Rd, Shanghai, China 2 Department of Electrical and Electronic Engineering, The University of Melbourne, VIC 3010, Australia 3 Department of Information Engineering, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong, China Received: 17 May 2008, Revised: 3 August 2008, Accepted: 4 August 2008 Published online: 24 September 2008