Abstract
Today’s photonic infrastructure, whose foundations were established several decades ago, gradually extends from global backbone to access networks and even further, down to the curb, building, home, and desk. Recent studies indicate that each household in North America should be connected by at least 100 Mb/s (e.g., CANARIE [1]), which cannot be accommodated by the last century’s technology. The 100 Gb/s Ethernet is currently under standardization, and according to industry experts 1 Tb/s Ethernet should be standardized by the year 2012–2013 [2–5]. Migrating to higher transmission rates comes along with certain challenges such as degradation in the signal quality due to different linear and nonlinear channel impairments and increased installation costs [5–9]. In addition to increased bandwidth, future optical networks will also require flexible wavelength management, the integration of transmission and switching, and optical signal processing functionality, while maintaining minimized operational and capital expenditures. Current limitations of photonics-enabled networks also result from the heterogeneity of the infrastructure and consequential bottlenecks at different boundaries and interfaces. In optically routed networks, neighboring dense wavelength division multiplexing (DWDM) channels carry random traffic patterns in which different lightwave paths experience different penalties due to the deployment of reconfigurable optical add-drop multiplexers (ROADMs) and wavelength cross-connects (WXCs). Different wavelength channels carrying the traffic to different destinations can have quite different signal-to-noise ratios (SNRs) and spectral distortions due to cascaded filtering effects. The Internet of the future should be able to support a wide range of services containing a large amount of multimedia over different network types at high speed [10]. The future optical networks will allow the integration of fiber-optics and free-space optical (FSO) and RF and optical technologies [10–14].
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Djordjevic, I., Ryan, W., Vasic, B. (2010). Future Research Directions in Coding for Optical Channels. In: Coding for Optical Channels. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-5569-2_11
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