All Materials regarding to B.tech R-20 in Electronics and communication Engineering with unit wise for Every Subjects are available.
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| ECE 4-1 Optical Communications | ||
|---|---|---|
| S.No | Chapters / Units | Download Link |
| 1 | Unit 1 | Download |
| 2 | Unit 2 | Download |
| 3 | Unit 3 | Download |
| 4 | Unit 4 | Download |
| 5 | Unit 5 | Download |
ECE 4-1 Optical Communications Important Topics Questions
UNIT I
Overview of optical fiber communication - Historical development, The general system,
advantages of optical fiber communications. Optical fiber wave guides- Introduction, Ray
theory transmission, Total Internal Reflection, Acceptance angle, Numerical Aperture, Skew
rays, Cylindrical fibers- Modes, V-number, Mode coupling, Step Index fibers, Graded Index
fibers, Single mode fibers- Cut off wavelength, Mode Field Diameter, Effective Refractive
Index, Related problems.
UNIT II
Fiber materials:- Glass, Halide, Active glass, Chalgenide glass, Plastic optical fibers. Signal
distortion in optical fibers-Attenuation, Absorption, Scattering and Bending losses, Core and
Cladding losses, Information capacity determination, Group delay, Types of Dispersion:-
Material dispersion, Wave-guide dispersion, Polarization-Mode dispersion, Intermodal
dispersion, Pulse broadening in Graded index fiber, Related problems.
UNIT III
. Optical fiber Connectors-Connector types, Single mode fiber connectors, Connector return
loss, Fiber Splicing- Splicing techniques, Splicing single mode fibers, Fiber alignment and
joint loss- Multimode fiber joints, single mode fiber joints.
UNIT IV
Optical sources- LEDs, Structures, Materials, Quantum efficiency, Power, Modulation,
Power bandwidth product. Injection Laser Diodes- Modes, Threshold conditions, External
quantum efficiency, Laser diode rate equations, Resonant frequencies, Reliability of
LED&ILD, Optical detectors- Physical principles of PIN and APD, Detector response time,
Temperature effect on Avalanche gain, Comparison of Photo detectors, Related problems.
UNIT V
Source to fiber power launching - Output patterns, Power coupling, Power launching,
Equilibrium Numerical Aperture, Laser diode to fiber coupling, Optical receiver operation-
Fundamental receiver operation, Digital signal transmission, error sources, Receiver
configuration, Digital receiver performance, Probability of Error, Quantum limit, Analog
receivers.
Optical system design - Point-to- point links- Component choice and considerations, Link
power budget, Rise time budget with examples, Line coding in Optical links, WDM,
Necessity, Principles, Measurement of Attenuation and Dispersion, Eye pattern.
TEXT BOOKS:
1. Optical Fiber Communications – Gerd Keiser, Mc Graw-Hill International edition,
3rd Edition, 2000.
2. Optical Fiber Communications – John M. Senior, PHI, 2nd Edition, 2002.
RERFERENCES:
1. Fiber Optic Communications – D.K. Mynbaev , S.C. Gupta and Lowell L. Scheiner,
Pearson Education,2005.
2. Text Book on Optical Fiber Communication and its Applications – S.C.Gupta, PHI,
2005.
3. Fiber Optic Communication Systems – Govind P. Agarwal , John Wiley, 3rd Edition,
2004.
4. Fiber Optic Communications – Joseph C. Palais, 4th Edition, Pearson Education, 2004.
OUTCOMES:
After going through this course the student will be able to
1. Choose necessary components required in modern optical communications systems .
2. Design and build optical fiber experiments in the laboratory, and learn how to
calculate electromagnetic modes in waveguides, the amount of light lost going
through an optical system, dispersion of optical fibers.
3. Use different types of photo detectors and optical test equipment to analyze optical
fiber and light wave systems.
4. Choose the optical cables for better communication with minimum losses
5. Design, build, and demonstrate optical fiber experiments in the laboratory.
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