Advanced Optical Performance Monitoring for Next-Generation Dynamic Optical Networks
Date: Friday, September 26, 2014
Time: 1:30pm Pacific Time
Ever-growing demand for speed and bandwidth and increasing energy consumption in today’s networks are driving the need for intelligent next-generation networking architectures that can overcome fundamental spectral and energy limitations. Metro-only internet traffic in particular is experiencing unprecedented growth and is projected to exceed long-haul traffic by 40% in 2017; current static peak capacity provisioned networks are ill-equipped to address such “bursty” traffic patterns. Dynamic optical networking, where bandwidth is allocated on-demand in the physical layer in response to changing traffic demands and network conditions, is a promising solution to address these challenges. Rapidly changing network configurations, however, cause unpredictable transmission impairments and result in network instability. Real-time awareness of the state of the physical layer is necessary for managing signal quality and reliability in a dynamic network and can be achieved through ubiquitous distribution of advanced optical performance monitors in a network.
Delay-line-interferometer (DLI) based optical-signal-to-noise (OSNR) monitor is a good candidate for ubiquitous monitoring as it is cost-effective and supports multiple advanced modulation formats. Its greatest drawback is that its measurements are modulation-format and bit-rate dependent, rendering it ineffective in future networks operating in a mixed line rate and modulation formats framework. In our recent work we demonstrated that by using pilot-tones, modulation-format and bit-rate awareness is realized in the monitor. Autonomous signal quality decisions, even in presence of modulation-dependent cross-talk, is achieved facilitating scalable cross-layer impairment aware routing.
CIAN Graduate Student
Atiyah Ahsan received the B.Sc. degree in electrical engineering (summa cum laude, thesis with highest honors) from Tufts University, Boston and the M.Sc. degree from Columbia University, New York in 2010 and 2012 respectively. From May 2012 to January 2013, she worked as a student collaborator on a project led by Dr. Daniel Kilper at Bell Labs Alcatel Lucent. She is currently a Ph.D. candidate at the Columbia University Lightwave Research Laboratory under the advisement of Professor Keren Bergman. Her research is focused on advanced optical performance monitoring techniques and cross-layer architectures for next-generation dynamic access and metro-networks.
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