Contents



Preface

Optical fibers are of great interest for scientific and technological applications,

electronic and optoelectronic devices to increase its performance.

whose optical properties will depend on the polymer functionality.

Optical fiber networks are the standard applied for high-bandwidth customers. Various access technologies to business networks with very high bandwidth to access networks for buildings and individual consumers have emerged. Chapter 3 discusses the optical network connections inside buildings for commercial and domestic users, including the use of optical glass fibers or/and polymeric optical fibers in different network topologies in connection to high-speed actual WIFI

The second part of this book is dedicated to the application of optical fibers in communications. Chapter 4 deals with coded modulation and impairment compensation techniques in optical fiber communication. Probabilistic shaping is a new coded modulation technology that can reduce transmission power by precoding, reducing the bit error rate, and improving communication rate. In this chapter, a probabilistic shaping 16QAM modulation scheme based on trellis-coded modulation is proposed. Experimental results show that this scheme can achieve better optical SNR gain and BER performance. On the other hand, to meet the demand of transmission rate of next-generation high-speed optical communication systems, multidimensional modulation and coherent detection are suffi-

Nowadays, due to the renewed demand on data bandwidth imposed by the upcoming capacity crunch, the optical communication (research and industry) community has oriented its effort to space division multiplexing (SDM),

In the first section on technology, Chapter 1 discusses the technology that has been developed to generate better optical fiber products with increased transmission speed, such as multi-core fibers. Increased transmission rates can be achieved via the use of space division multiplexing, allowing for an increase in the information in one optical fiber. Of course, a multi-core fiber must be coupled with specific

A wide variety of fiber devices can be created by adding special coatings on tapered sections of optical fibers. Chapter 2 presents the fundamentals for the fabrication of tapered optical fibers coated with functional polymers. Here, the required aspects of light propagation in tapered sections of optical fibers are introduced and the relevant parameters enabling light interaction with external media are discussed. A special case of interest is the addition of polymeric coatings with prescribed thicknesses in the tapered sections allowing for adjusting the light propagation features; using liquid polymer coatings with varying thicknesses along with the taper profile that can be tailored for tuning the transmission features of the devices. The chapter also presents a methodology for obtaining coatings with predefined geometries

especially in communications systems.

technologies.

ciently applied.

*by Alexander Bortsov*
