(This book mainly explains the optical fiber in detail, which is very helpful for beginners, and has an overall improvement in technology and use. 1. Introduction 2. Optical fiber structure and guided wave principle and fabrication 3. Signal damage in optical fiber 4. Light source 5. Optical efficiency emission and coupling 6. Optical detector 7. Optical receiver 8. Digital optical fiber communication system 9. Simulation Optical Fiber Communication Systems 10. WDM Concepts and Devices 11. Optical Amplifiers 12. Optical Fiber Communication Networks 13. Optical Fiber Communication Measurements)