O'Reilly logo

Fiber Optic Communications: Fundamentals and Applications by Shiva Kumar, M. Deen

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Chapter 8Performance Analysis

8.1 Introduction

In Chapter 4, various types of digital modulation schemes such as PSK, OOK, and FSK were introduced and in Chapter 5, different receiver architectures such as direct detection, homodyne, and heterodyne detections were discussed. In this chapter, the performances of these modulation schemes with the different receiver architectures are investigated. Firstly, the concept of a matched filter is introduced in Section 8.2. In practice, optical matched filters are rarely used in optical communication systems due to the difficulties involved in fabricating such a matched filter. Nevertheless, the performance is optimum when the matched filters are used, and the expressions for the error probability developed in this Chapter using the matched filters provide a lower bound on the achievable BER.

c08f001

Figure 8.1 A generalized model for the optimum binary receivers.

8.2 Optimum Binary Receiver for Coherent Systems

In this section, we consider the generalized model for the optimum binary receivers (See Fig. 8.1) and later, we apply this model to various detection schemes. Let c08-math-0001 and c08-math-0002 be the real optical signals used to transmit bits ‘1’ and ‘0’, ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required