@article{filer2016elastic, author = {Filer, Mark and Gaudette, Jamie and Ghobadi, Manya and Mahajan, Ratul and Issenhuth, Tom and Klinkers, Buddy and Cox, Jeff}, title = {Elastic Optical Networking in the Microsoft Cloud}, year = {2016}, month = {July}, abstract = {To keep pace with the tremendous bandwidth growth in cloud networking, web-scale providers, such as Microsoft, have been quick to adopt elastic features of modern optical networks. In particular, colorless flexible-grid reconfigurable optical add-drop multiplexers, bandwidth-variable transceivers, and the ability to choose a variety of optical source types are integral for cloud network operators to improve network efficiency while supporting a variety of service types. We take an in-depth look at Microsoft's deployed network infrastructure and discuss the impact of elasticity on network capacity and flexibility. As a proof-of-concept, a new elastic open line system (OLS), in which the line system components and the signal sources are disaggregated, was assembled in a laboratory environment, and 4000 km of propagation over primarily nonzero dispersion-shifted fiber using multiple source types is demonstrated. Finally, the long-term goal of unifying the control plane of the OLS, DWDM signal sources, routers, and Ethernet switches under a single software-defined network controller is briefly addressed.}, url = {http://approjects.co.za/?big=en-us/research/publication/elastic-optical-networking-microsoft-cloud/}, pages = {A45-A54}, journal = {Journal of Optical Communications and Networking}, volume = {8}, chapter = {6}, }