A STUDY ON LASER CHARACTERISTICS AND THE IMPLEMENTATION OF AN OPTICAL FSK HETERODYNE SYSTEM

Abstract

Chapter 1 introduces the background of FSK heterodyne coherent system. The modulation format, detection method, and IF demodulation of the coherent system are discussed. Some important aspects which could affect the performance of the system during implementation are also discussed at the last section of this chapter. The laser transmitter or laser diode characteristics are covered in chapter 2 and chapter 3. The theoretical explanation of laser's static characteristic is described in chapter 2. The laser's dynamic characteristic, also referred as the laser response under modulation of injection current, is described in chapter 3. It is also called as laser's modulation response. The transmitter functional block is explained in chapter 4. In the beginning of chapter 5, the measurement result of laser diode's characteristics are shown and analyzed. Then, a more detailed explanation of the technique for laser modulation response measurement are covered in the remaining of chapter 5 followed by its measurement result. Chapter 6 covers the some of the important aspects which affects the receiver performance. Then, the receiver building block implementation is also shown followed by the waveform received.