Title: Launch power determination algorithm for dynamic traffic provisioning in mixed-line-rate optical wavelength division multiplexed networks
Authors: Sridhar Iyer; Shree Prakash Singh
Addresses: Department of Electronics and Communication Engineering, Faculty of Engineering, Christ University, Mysore Road, Bangalore, 560060, India ' Division of ECE, Netaji Subhas Institute of Technology, Azad Hind Fauj Marg, Sector-3, Dwarka, New Delhi, 110078, India
Abstract: In transparent mixed-line-rate (MLR) optical networks, different line rates, on different wavelengths, can coexist on the same fibre. However, along the path, signal experiences various physical layer impairments (PLIs), and its quality also degrades. A major factor that affects transmission quality is launch power of the optical signal. On one hand, power must be high enough to ensure less noise at receiver; on the other hand, it must be lower than the limit where PLIs start to distort the signal. Further, high launch power is disruptive to both, the actual lightpath and its neighbours. In this study, we investigate the problem of determining appropriate launch power for provisioning dynamic connection requests in transparent MLR networks. We propose a heuristic that determines the appropriate launch power of a lightpath. The PLI-average (PLI-A) approach is based on the optical reach of signals, is practical, and can adapt to the needs of network operators. Results show that performances of the proposed approach are better than the existing schemes.
Keywords: physical layer impairments; PLIs; impairment-aware provisioning; dynamic provisioning; lightpath launch power; mixed-line-rate networks; MLR networks; optical networks; traffic provisioning.
International Journal of Internet Protocol Technology, 2015 Vol.9 No.1, pp.23 - 33
Received: 01 Jul 2015
Accepted: 22 Aug 2015
Published online: 22 Jan 2016 *