Candidate: Ali Saheb Pasand
Title: Methods for Compensation of Nonlinear Impairments in Fiber-Optic Communication Systems
Date: February 26, 2018
Time: 10:20am
Place: EIT 3142
Supervisor(s): Khandani, Amir K.
Abstract:
Fiber optic links are the backbone of the current high-speed tele- and data communication networks. Two major factors which cause degradation in the performance of this type of communication systems are fiber optic link nonlinear impairments, self-phase and cross-phase modulation, and linear additive noise. To tackle with linear noise, the average energy of constellation points should be increased and this increment also increases the nonlinear impairments. This research explores some possible methods of tackling the issues caused by nonlinear impairments without changing the average energy of constellation points.
Among all introduced methods in my thesis, “Modelling Non-linearity with an N-span Model” has been chosen to be presented in this seminar. First, a known method for compensating Self-Phase Modulation (SPM) noise will be discussed. Then, a simplified model will be introduced which helps us with performing compensation with low computational complexity and low used memory. Next, two different methods for training the model will be introduced, statistical and algebraic fitting. At the end, we will take a look into the results obtained from doing compensation procedure with this N-span model.