OPTICAL COMMUNICATION NETWORKS (18EC824)

OPTICAL COMMUNICATION NETWORKS

Course Code : 18EC824
CIE Marks :40
Lecture Hours/Week : 03 
SEE Marks : 60
Total Number of Lecture Hours 2 40 (08 Hrs / Module) 
Exam Hours :03
CREDITS — 03

Course Learning Objectives: This course will enable students to:

• Learn the basic principle of optical fiber communication with different modes of light propagation.
• Understand the transmission characteristics and losses in optical fiber.
• Study of optical components and its applications in optical communication networks.
• Learn the network standards in optical fiber and understand the network architectures along with its functionalities.

Module -1

Optical fiber Communications: Historical development, The general system, Advantages of optical fiber communication, Optical fiber wave guides: Ray theory transmission, Modes in planar guide, Phase and group velocity, Cylindrical fiber: Modes, Step index fibers, Graded index fibers, Single mode fibers, Cutoff wavelength, Mode field diameter, effective refractive index. Fiber Materials, Photonic crystal fibers.(Text 2) L1, L2

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Module -2

Transmission characteristics of optical fiber: Attenuation, Material absorption losses, Linear scattering losses, Nonlinear scattering losses, Fiber bend loss, Dispersion, Chromatic dispersion, Intermodal dispersion: Multimode step index fiber. Optical Fiber Connectors: Fiber alignment and joint loss, Fiber splices: Fusion Splices, Mechanical splices, Fiber connectors: Cylindrical ferrule connectors, Duplex and Multiple fiber connectors, Fiber couplers: three and four port couplers, star couplers, Optical Isolators and Circulators. (Text 2) L1, L2

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Module -3

Optical sources: Light Emitting diodes: LED Structures, Light Source Materials, Quantum Efliciency and LED Power, Modulation. Laser Diodes: Modes and Threshold conditions, Rate equation, External Quantum Efficiency, Resonant Frequencies. Photodetectors: Physical principles of Photodiodes, Photo detector noise, Detector response time. Optical Receiver: Optical Receiver Operation: Error sources, Front End Amplifiers, Receiver sensitivity, Quantum Limit. (Textl) L1, L2

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Module —4

WDM Concepts and Components: Overview of WDM: Operational Principles of WDM, WDM standards, Mach-Zehnder Interferometer Multiplexers, Isolators and Circulators, Fiber grating filters, Dielectric Thin-Film Filters, Diffraction Gratings. Optical amplifiers: Basic application and Types, Semiconductor optical amplifiers, Erbium Doped Fiber Amplifiers, Raman Amplifiers, VVideband Optical Amplifiers. (Text 1) L1, L2

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Module -5

Optical Networks : Optical network evolution and concepts: Optical networking terminology, Optical network node and switching elements, Wavelength division multiplexed networks, Public telecommunication network overview. Optical network transmission modes, layers and protocols: Synchronous networks, Asynchronous transfer mode, OSI reference model, Optical transport network, Internet protocol, Wavelength routing networks: Routing and wavelength assignment, Optical switching networks: Optical circuit switched networks, packet switched networks, Multiprotocol Label Switching, Optical burst switching networks. (Text 2) L1, L2

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Course Outcomes: At the end of the course, students will be able to:

1. Classify and describe working of optical fiber with different modes of signal propagation.
2. Describe the transmission characteristics and losses in optical fiber communication.
3. Describe the construction and working principle of optical connectors, multiplexers and amplifiers.
4. Describe the constructional features and the characteristics of optical Sources and detectors.
5. Illustrate the networking aspects of optical fiber and describe various standards associated with it.

Question paper pattern:

Examination will be conducted for 100 marks with question paper containing 10 full questions, each of 20 marks.
Each 1 question can have a maximum of 4 sub questions.
There will be 2 full questions from each module covering all the topics of the module.
Students will have to answer 5 full questions, selecting one full question from each module.
The total marks will be proportionally reduced to 60 marks as SEE marks is 60.

Text Books:

1. Gerd Keiser, Optical Fiber Communication, 5th Edition, Mc Graw Hill Education (India) Private Limited, 2015. ISBN: 1 -25-900687-5.
2. John M Senior, Optical Fiber Communications, Principles and Practice, 3rd Edition, Pearson Education, 2010, ISBN:978-81-317-3266-3

Reference Book:

Joseph C Palais, Fiber Optic Communication, Pearson Education, 2005, ISBN:0130085103.