Nonlinear equalizer for coherent OFDM optical systems
Gerardo Antonio Castañón Ávila
Summary or description
Given the exponential increase of data rates demand in the recent years, optical communications offers an attractive solution due to several advantages when compared with wireless
communications, some of them are unlimited bandwidth and low losses for long distances
communications, due to those advantages optical networks have become a natural choice for
supporting ever-increasing broadband services for future high-speed networks like 5G and 6G
This document consists of six chapters covering various topics related to optical communication networks including characteristics, challenges, and novel algorithms permitting to
improve the optical network performance.
As a start, an introduction for a general perspective of the dissertation is presented in
chapter I and the definition of different concepts of optical networks are presented in Chapter II, in this chapter the concept of passive optical network (PON), Orthogonal frequency
multiplexing (OFDM) and other concepts that are important to understand are described.
In Chapter III, the concept of elastic optical network is defined and the problem of
routing and spectrum allocation (RSA) in elastic optical networks is defined, in this chapter
an exhaustive review of the state of the art to solve the RSA problem is presented with a
summary of key parameters that need to be taken into account for optical networks under
An innovative method to mitigate the optical nonlinearities of long haul coherent optical
networks is presented in Chapter IV. The presented method is an improvement in the state of
the art, the method uses the Hammerstein model to describe mathematically the optical fiber
link and by using an equalizer inspired by the inverse Hammerstein model it is possible to
improve the optical reach distance in long haul coherent OFDM access networks.
An invention to monitor the optical communications links and detect failures is presented in chapter V, the subject of the presented invention is an improvement of optical amplifiers used in the radio over glass systems (RoG) systems and it is applied to CATV networks.
Finally, chapter VI presents general conclusions and future work.
Doctor en Tecnologías de Información y Comunicaciones
Instituto Tecnológico y de Estudios Superiores de Monterrey
June 15, 2020
Repositorio Institucional del Tecnológico de Monterrey