The study of deployment basics of OLS-based backhaul networks

Authors: 
Kaidan M., Andrushchak V., Dumych S., Pashkevych V.

Lviv Polytechnic National University

Unified network platform to support voice, data and multimedia applications is attractive for optical level. Optical packet switching (OPS) provides a platform where the only transport data unit for all type of traffic will be package. On the other hand, quality of service (QoS), class of service (CoS) and the type of service (ToS) required for the future of the Internet more elaborated and more powerful control plane. Optical switching labels (OLS) supports OPS, optical flow switching (OFS) and optical burst switching (OBS) with full interoperability of QoS, CoS and ToS.
In paper presented basic principles of the technology OLS where attention was focused on the rules of processing optical labels. Described in detail the principles of data transmission in optical transport networks with technology OLS, namely data transmission modes where the payload with label are transmitted in common and different optical channels. Investigated bottlenecks of each mode of data transmission, where established that one such place is the using of optical buffers in intermediate nodes. Presented the simplified structure of the intermediate node for optical transport network technology OLS.
Particular attention in the modes of data transmission was focused the rules of transfer labels between boundary nodes, calculation time between payload and label, data processing at intermediate nodes and the implementation of optical switching. Considered data transfer mode where unnecessary use of optical buffers.
Special attention is focused on the existing problems of technology OLS, such as determining the size of the transport data unit, content and size of the packet-header (label), the high cost of accurate optical buffers, absence of algorithms for accurate synchronization label and transport data unit, design architecture intermediate node and optical switch.

 

1.    S.J. B. Yoo and G.K. Chang (1997) High-throughput Low-Latency Next Generation Internet Networks using Optical-Tag Switching. U.S. Patent 6,111,673..
2.    S.J.B.Yoo (2003) Optical-label switching, MPLS, MPLambdaS and GMPLS. Optical Networks Magazine, v.4, pp. 17-31.
3.    B.Meagher, G.K. Chang, G.Ellinas, Y.M.Lin, W.Xin, T.F.Chen, X.Yang, A.Chowdhury, J.Young, S.J.Yoo, C.Lee, M.Z.Iqbal, T.Robe, H.Dai, Y.J.Chen, and W.I.Way (2000). Design and Implementation of Ultra-Low Latency Optical Label Switching for Packet-Switched WDM Networks. Journal of Lightwave Technology. V.18. - №12. – p. 1978 – 1987.
4.    Api technologies corp. Delay lines. Available at: http://micro.apitech.com/delay_lines.aspx
5.    Thorlabs. 220 mm Optical Delay Line Kit. Available at: https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=5521
6.    Newport. Optical Fiber Delay Lines, Manually Variable. Available at: https://www.newport.com/f/optical-delay-lines-manually-variable