What Photonics Can Do for Switching in Transparent Optical Networks
2010 (English)In: European Conference on Networks and Optical Communications (NOC), 2010Conference paper (Other academic)
Transparent optical networks, based on WDM technology, are considered as the mostpromising candidates for future high capacity communication networks because of theirscalability and energy efficiency. In such networks, switching functions will be carriedout directly in the optical domain so that high speed optical signals will traverse thenetwork without any optical-to-electrical conversion. Different switching paradigms canbe applied, such as optical circuit switching OCS, optical burst switching OBS andoptical packet switching OPS, offering different switching granularities and performance.A number of challenges are associated with each of the switching paradigm. This talkwill highlight some of these challenges and review pros and cons of using photonictechnology for switching in communication networks. The optical circuit switching (OCS) is based on a course switching granularity (mostly atwavelength level). It provides end-to-end optical channels (lightpaths) between sourceand destination nodes. The basic function of OCS network is solving routing andwavelength assignment (RWA) problem, i.e. finding a suitable physical path for eachlightpath request and assigning an available wavelength to it. A suitable OCS nodearchitecture and technology can significantly improve network performance.On the other hand, switching in OPS networks should be done on per packet basisproviding high switching granularity, which in turn gives a potential for better resourceutilization compared with OCS. However, several fundamental problems need to besolved in order to implement OPS networks. In particular, packet contention at the OPSnodes needs to be efficiently handled in order to guarantee required networkperformance. However, lack of flexible optical memory makes the contentionresolution in optical domain very difficult.
Place, publisher, year, edition, pages
IdentifiersURN: urn:nbn:se:kth:diva-85524OAI: oai:DiVA.org:kth-85524DiVA: diva2:499966
15th European Conference on Networks and Optical Communications. Faro-Algarve, Portugal. 8-10 June 2010
QC 201204232012-02-132012-02-132016-04-11Bibliographically approved