Loading...

Resource Allocation and Optical Amplification in Elastic Optical Networks

Akhavan Mokhtarani, Ehsan | 2019

408 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52379 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Pakravan, Mohammad Reza
  7. Abstract:
  8. Diversity of new traffic patterns, due to new applications such as cloud computing, online gaming, Internet of Things (IoT), and Video on Demand (VoD), have pushed more dynamic behavior and faster reconfiguration to traditional networks. Elastic Optical Network (EON) is a new concept to response these requirements. Spectrum efficiency will be increased by exploiting OFDM-based elastic optical network. As a result, increasing fiber nonlinear effects would be a consequence of compression of spectrum. Optical Amplifier is used in optical networks to compensate fiber loss along the optical path. Amplifiers placement, in most of papers, is considered fixed at the end of each invariant span. This is not valid due to practical constraints such as providing physical safety and power for amplification sites, that limits the placement of amplifiers at fixed spans. The more the length of the spans the more the fiber nonlinearity effects are, as a result of more transmitting power. The problem that we have addressed in this thesis are routing, spectrum ordering and allocation, power assignment, and optical amplifier gain tuning regarding to considering quality of signal at receiver and restrictions of amplifier placement and its characteristics. solving these problems jointly is categorized as a non-deterministic polynomial-time hard (NP-hard) problem, since a heuristic solution is proposed. First, routing phase by using Dijkstra algorithm is simulated. Then, spectrum ordering as an integer linear program (ILP) with target of minimization of spectrum usage, will be optimized. At last nonlinear problem of spectrum, power assignment, and gain tuning with the aim of decreasing spectrum usage and number of used amplifiers, is solved. Results are compared with the scenario that fiber nonlinearities not considered. Improvement of 30% in spectrum usage and … reduction of number of used amplifiers are achieved.
  9. Keywords:
  10. Elastic Optical Networks (EON) ; Resources Allocation ; Optical Network Practical Constraints ; Spectrum Assignment ; Routing

 Digital Object List

 Bookmark

No TOC