EC8751_Optical_Communication_U01_P01.pptx

EC8751 Optical Communication

1. GOVERNMENT COLLEGE OF ENGINEERING BODINAYAKANUR DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING EC8751 OPTICAL COMMUNICATION (ECE VII Semester R-2017) M. Rajamadasamy , M.Tech Assistant Professor/ECE

2. Outline Why Optical Communication? Advantages Elements of Fiber Optic Link Course Objective Syllabus 2

3. Why Optical Communications? Optical Fiber is the Backbone of the Modern Communication Networks The Optical Fiber Carries: Almost all long distance phone calls Most of Internet traffic (DSL or Cable) Most Television channels (Cable or DSL) Fiber to the Home (FTTH) BharatNet – 1Gbps link for 2.5 Lakh Villages Information Revolution ‘Triple Play’ 3

4. Provides Highest Bit Rate of any communication channel (100 Gb/s or more) Very High Information Carrying Capacity . (Terahertz) - WDM offers easy upgradability Less Attenuation (order of 0.2 dB/km) The ‘ Optical Layer’ : Wavelength routing, switching and processing all optically, which adds another layer of flexibility No Cross Talk And Disturbances ADVANTAGES OF OPTICAL FIBERS 4

5. Difficult To Tap Fibers, So Secure Immune To EMI/RF, Moisture & Corrosion Is Dielectric in nature, So can be laid in Electrically Sensitive Surroundings Small in Diameter and Size & Light Weight Low cost as compared to that of Copper ADVANTAGES OF OPTICAL FIBERS (Contd..) 5

6. WHY Fiber? 6 50 100 150 200 Gbps Twisted Pair Co-ax Multimode Single-mode

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8. Elements of a Fiber Optic Link 8

9. Course Objectives To study about the various optical fiber modes, configuration and transmission characteristics of optical fibers To learn about the various optical sources, detectors and transmission techniques To explore various idea about optical fiber measurements and various coupling techniques To enrich the knowledge about optical communication systems and networks 9

10. Syllabus UNIT I - Introduction To Optical Fibers Optical modes and Configurations Mode analysis for optical propagation through fibers Fiber materials – Fiber Fabrication techniques Classification of optical fiber UNIT II - Transmission Characteristic Of Optical Fiber Losses - Attenuation , Absorption, Scattering and Bending Dispersion – Material, Waveguide, Inter- Modal, Intra-Modal, Polarisation Mode Characteristics of Single Mode Fiber ( SMF ) Mode Field Diameter Unit III - Optical Sources And Detectors Sources: Lasers, LEDs Q uantum Efficiency , Modulation, Rate Equation Detectors: PIN photo detector-Avalanche photo diodes Photodector Noise 10

11. Syllabus (Contd..) Unit IV - Optical Receiver, Measurements And Coupling Fundamental Receiver Operation Error sources, Probability of error, Receiver Sensitivity, Quantum limit Measurement : Optical power, Attenuation, Dispersion, Numerical Aperture, Cut- off Wave length Fiber Joints, Connectors, Splicing Unit V - Optical Communication Systems And Networks Point to Point link design, Link power budget , Rise time budget, WDM –Passive DWDM Components-Elements of optical networks - SONET/ SDH Optical Interfaces OADM configuration- Optical ETHERNET, Soliton. 11