Page 17 - Fiber Optic Communications Fund

xvi Preface

In Chapters 7 and 8, the photonics and optoelectronics devices discussed so far are put together to form a
fiber-optic transmission system. Performance degradations due to fiber loss, fiber dispersion, optical ampli-
fier noise, and receiver noise are discussed in detail in Chapter 7. Scaling laws and engineering rules for
fiber-optic transmission design are also provided. Performance analysis of various modulation formats with
direct detection and coherent detection is carried out in Chapter 8.
To utilize the full bandwidth of the fiber channel, typically, channels are multiplexed in time, polarization
and frequency domains, which is the topic covered in Chapter 9. So far the fiber-optic system has been treated
as a linear system, but in reality it is a nonlinear system due to nonlinear effects such as the Kerr effect and
Raman effect. The origin and impact of fiber nonlinear effects are covered in detail in Chapter 10.
The last chapter is devoted to the study of digital signal processing (DSP) for fiber communication sys-
tems, which has drawn significant research interest recently. Rapid advances in DSP have greatly simplified
the coherent detection receiver architecture – phase and polarization alignment can be done in the electrical
domain using DSP instead of using analog optical phase-locked loop and polarization controllers. In addi-
tion, fiber chromatic dispersion, polarization mode dispersion and even fiber nonlinear effects to some extent
can be compensated for using DSP. About a decade ago, these effects were considered detrimental. Different
types of algorithm to compensate for laser phase noise, chromatic dispersion, polarization mode dispersion
and fiber nonlinear impairments are discussed in this chapter.
Supplementary material including PowerPoint slides and MATLAB coding can be found by following
the related websites link from the book home page at http://eu.wiley.com/WileyCDA/WileyTitle/productCd
-0470518677.html.