Courses » Fiber Optics

Fiber Optics


The course is aimed at equipping the undergraduate Engineering and Physics students with the basic understanding of optical fibers and optical fiber communication. The course provides knowledge of optical fiber waveguide at fundamental level, essentials of an optical fiber communication system and understanding of various components of an optical fiber telecommunication system.


It is an elective course for Undergraduate students of Electronics and Communication Engineering, Computer Science and Engineering, Electrical Engineering, Information Technology, Engineering Physics, and Industry Personnel of Optical Fiber and Communication Industry


A basic course on Electromagnetic Theory


Sterlite Technologies Ltd., Tejas Networks, Ciena Networks, Infinera India Pvt. Ltd, Eagle Photonics, Nest Photonics, etc, may recognize the course.

2158 students have enrolled already!!


Dr. Vipul Rastogi received PhD degree from the Indian Institute of Technology, Delhi, India in 1998. He carried out post-doctorate in Université de Nice Sophia Antipolis, France during 1998 – 1999. From 2000 to 2003 he worked in the Department of Electronic Engineering in City University of Hong Kong as a Research Fellow. In November 2003 he joined Department of Physics at Indian Institute of Technology Roorkee, where he is now an Associate Professor. His current research interests are in optical fiber designs for high power lasers and high data rate optical communication, erbium doped fiber amplifier for SDM communication system, optical fiber sensors, and optoelectronic devices. He has published over 150 research papers in refereed journals and conferences. He is a member of IEEE Photonics Society, Senior Member of Optical Society of America, Life Member of Indian Laser Association and Fellow of Optical Society of India. IIT Roorkee honored him with an Outstanding Teacher Award in the year 2011. He is a recipient of IAPT-Dinbandhu Sahu Memorial award for undergraduate Physics teaching from Indian Association of Physics Teachers in the year 2016.


Week 1:
 Introduction, need for optical communication, salient features of optical fibers, ray theory of light guidance, numerical aperture, modes of a fiber, single and multimode fibers, step-index and graded-index fibers, fiber fabrication techniques

Week 2:
 Transmission characteristics of optical fibers, attenuation, pulse broadening mechanism, intermodal dispersion, bit rate - length product, material dispersion, electromagnetic wave analysis of light propagation in an infinitely extended medium, em waves in dielectrics, boundary conditions

Week 3: Electromagnetic analysis of planar optical waveguides, TE and TM modes, planar mirror waveguide, dielectric symmetric step-index, planar waveguide, symmetric and anti-symmetric modes, b-V curves, modal fields

Week 4: Power associated with modes of dielectric symmetric planar waveguide, asymmetric planar waveguide, single polarization single mode waveguide, excitation of guided modes by prism coupling technique, radiation modes, optical fiber waveguide, EH and HE modes, weakly guiding fibers, LP modes, mode cut-offs, b-V curves

Week 5:
 Optical fiber modes, field patterns, degeneracies, fractional power in the core, single mode fiber, cut-off wavelength, mode field diameter, bend loss, splice loss, waveguide dispersion, group delay

Week 6: Total chromatic dispersion, pulse broadening and chirping, dispersion in graded-index and multilayer fibers, optical fiber components and devices, directional coupler, power splitter, WDM coupler, polarization controllers, fiber Bragg gratings

Week 7:
 Various types of fiber Bragg gratings, fabrication methods, applications, long period gratings, optical fiber amplifier, erbium doped fiber amplifier, dispersion management, dispersion shifted fiber, dispersion compensating fiber, sources for optical fiber communication, light emitting diode, internal and external quantum efficiencies, LED characteristics, laser diode

Week 8: Detectors for optical communication, p-i-n photodetector, APD, System design, dispersion and attenuation limited systems, BER, power budgeting of fiber link, recent advances


  • Ghatak A K and Thyagarajan K, “Introduction to Fiber Optics”, Cambridge University Press
  • Saleh B E A and Teich M C, “Fundamentals of Photonics,” Wiley-Interscience
  • Agrawal G P, “ Optical Fiber Communication System,” Wiley-Interscience
  • Keiser G, “Optical Fiber Communications”, McGraw Hill
  • Snyder A and Love J, “Optical Waveguide Theory”, Chapmann and Hall
  • Senior J M, “Optical Fiber Communications,” Pearson Prentice Hall
  • The exam is optional for a fee.
  • Date of Exam: March 31st 2019 (Saturday).
  • Time of Exam: Morning session 9am to 2 noon; Afternoon session: 2pm to 5pm
  • Registration url: Announcements will be made when the registration form is open for registrations.
  • The online registration form has to be filled and the certification exam fee needs to be paid. More details will be made available when the exam registration form is published.

  • Final score will be calculated as : 25% assignment score + 75% final exam score
  • 25% assignment score is calculated as 25% of average of  Best 6 out of 8 assignments
  • E-Certificate will be given to those who register and write the exam and score greater than or equal to 40% final score. Certificate will have your name, photograph and the score in the final exam with the breakup.It will have the logos of NPTEL and IIT Roorkee. It will be e-verifiable at nptel.ac.in/noc.