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13040712 Optical Communication L T P C
Version1.0 Date of Approval: 3 1 0 3

Course Objectives

  1. To learn the basic elements of optical fiber transmission link, fiber modes configurations and structures.
  2. To understand the different kind of losses, signal distortion in optical wave guides and other signal degradation factors.
  3. To learn the various optical source materials, LED structures, quantum efficiency, Laser diodes.
  4. To learn the fiber optical receivers such as PIN APD diodes, noise performance in photo detector, receiver operation and configuration.
  5. To learn the fiber optical network components, variety of networking aspects, FDDI, SONET/SDH and operational principles WDM.

Course Outcomes

On completion of this course you should be able to:

  1. Explain the principles of operation of various optical fibre communication systems.
  2. Analyse the performance of various digital and analogue optical fibre systems.
  3. Calculate various key parameters of optical fibre systems. These include the system optical power budget and system risetime budget, receiver noise power, Q factor, bit error rate and maximum usable bit rate of a digital optical fibre system.
  4. Explain/compare the factors affecting the performance of different optical fibre communication systems.
  5. Communicate laboratory findings through written reports. 

Catalog Description

Optical fibre systems include long distance backbone or trunk networks, metropolitan and access networks, passive optical networks and radio on fibre or fibre wireless systems. Fibre networks are also used to distribute signals for broadband wireless access networks.

The design of an optical fibre system involves many design factors and trade-offs. The characteristics and limitations of system components (laser diodes, optical modulators, optical fibre, optical amplifiers and optical receivers) and the factors affecting the performance of different optical fibre communication systems will be studied. 

Text Books

  1. G.Keiser: Optical Fiber Communication – MGH
  2. Jenkins & White : Fundamentals Of Optics – MGH
  3. M. Senior : Optical Fiber Communication – PHI
  4. Gagliardi & Karp: Optical Communication – Wiley 

Reference Books

  1. Bhattacharya, Pallab / “Semiconductor Optoelectronics Devices” / Pearson Education.
  2. Singh, Jasprit / “Optoelectronics An Introduction to Materials and Devices”/ McGraw-Hill
  3. Khare, R.P. / “Fiber Optics & Optoelectronics” / Oxford University Press
  4. Gupta, S.C. / “Text Book of Optical Fiber Communication & Its Applications”/ Prentice–Hall (India). 

Course Content

Unit I: Overview of optical fiber wave guides

12 lecture hours

General system, transmission link, advantage of optical fiber communication,basic structure of optical fiber waveguide, ray theory transmission, optical fiber modes and configuration, step index & graded index fiber, single mode fiber , fiber materials , fiber fabrication.

Unit II: Signal degradation in optical fiber                                                  

12 lecture hours

Introduction, attenuation , intrinsic & extrinsic absorption losses, linear & nonlinear scattering losses , bending losses , distortion in optical wave guide , intramodal and intermodal dispersion. Power launching and coupling Source to fiber power launching, power calculation , lensing schemes , fiber to fiber joints , fiber splicing technique , fiber connectors. 

Unit III: Optical sources

8 lecture hours

LASER: Basic concepts of laser, Optical emission from semiconductors, Semiconductor injection laser (ILD), Injection laser characteristics.LED: power and efficiency, LED structures, LED characteristics.

Optical detectors: p-n photodiodes, p-i-n photodiodes, Avalanche photodiodes, Quantum efficiency, speed of response, Phototransistor. 

Unit IV: Optical receiver                                                                                 

8 lecture hours

Receiver operation, digital receiver noise , shot noise , pre-amplifier types , Digital receiver performance, introduction to analog receivers.

Unit V: Digital transmission systems

8 lecture hours

Point to point links, system considerations, link power budget, rise time budget, modulation formats for analog communication system, introduction to WDM concepts, Introduction to advanced multiplexing strategies. 

Mode of Evaluation: The theory and lab performance of students are evaluated separately. 

  Theory Laboratory Theory and laboratory
Components Internal SEE Internal SEE
Marks 50 50 50 50
Total Marks 100 100
Scaled Marks 75 25 100