Nonlinear equalizer for coherent OFDM optical systems


Gerardo Antonio Castañón Ávila

Access level

Open Access

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

different topology.

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

Publish date

June 15, 2020

Publication type







General public

Source repository

Repositorio Institucional del Tecnológico de Monterrey




You need to sign in or sign up to comment.