Impairment aware networking and relevant resiliency issues in all-optical networks

Abstract

The issues and challenges associated with network planning and engineering of a dynamically reconfigurable all-optical network will be discussed. Possible solutions will be outlined and the effectiveness of some proposed solutions will be demonstrated. Extended AbstractProviding ultra high-speed end-to-end connectivity in core optical networks while satisfying the requirements for quality of service and network resiliency is a topic of intense research. In ultra-long-haul all-optical networks, the analog nature of the signal transmission through the network links and nodes introduces a number of issues (e.g. signal quality degradation due to impairment accumulation, difficulty in failure localization) that the system vendors and network operators have to somehow overcome or simply deal with them. In the past few years, it has been proposed that physical layer impairments or/and the overall optical signal performance should be monitored and considered in the network planning and operation processes. To support this network functionality evolution fast physical layer modeling techniques were developed, new optical performance and impairment monitoring schemes were proposed, novel impairment aware routing and wavelength assignment algorithms were introduced, failure localization algorithms for all-optical networks were discussed and associated control plane extensions were presented. These developments may be now integrated into the next generation optical networks that will accommodate dynamic traffic characteristics, rapid reconfigurability of the optical layer, and varying physical impairment/component characteristics. In this presentation, we will provide an overview of the related literature on the topic of impairment constraint optical networking and we will describe how the existing network planning and operation procedures could be extended to support a dynamically reconfigurable all-optical network environment.

Lightpath establishment in distributed GMPLS-controlled dynamic transparent optical networks using quality of transmission estimation

“…Transparent optical networks, utilizing optical switching technologies, are seen as the most promising solution to deliver high bandwidth on-demand at low costs in backbone networks [1]. Transparency increases optical signal propagation distances over which physical layer impairments (e.g., amplified spontaneous emission noise, polarization mode dispersion) accumulate, potentially resulting in unacceptable signal Quality of Transmission (QoT).…”

Lightpath Establishment Assisted by Offline QoT Estimation in Transparent Optical Networks

“…D ynamic transparent optical networks, where lightpaths are provisioned and established on demand, are widely seen as the key enabling technology for the core network of the future [1]. Indeed, in such networks, the removal of optical/electrical/optical (OEO) conversion can decrease both capital expenditures (CAPEX) and energy consumption at the same time [2], while the increased available bandwidth and flexibility can decrease operational expenditures (OPEX).…”