Fiber Optic Communication Technology

By Prof. Deepa Venkitesh   |   IIT Madras
Learners enrolled: 2854
FOCT is a graduate level course, intended to expose the students to the physical layer elements and seamlessly provide a transition from the physical layer issues to data link layer issues in optical communication systems and networks.

Any Interested Learners

PREREQUISITES Signals and Systems

INDUSTRIES  SUPPORT  : Sterlite Technologies Ltd., Tejas Networks, BSNL - other Telecom companies, BEL
Course Status : Completed
Course Type : Elective
Duration : 12 weeks
Category :
  • Electrical, Electronics and Communications Engineering
  • Photonics
Credit Points : 3
Level : Undergraduate/Postgraduate
Start Date : 25 Jul 2022
End Date : 14 Oct 2022
Enrollment Ends : 08 Aug 2022
Exam Date : 29 Oct 2022 IST

Note: This exam date is subjected to change based on seat availability. You can check final exam date on your hall ticket.

Page Visits

Course layout

Week 1 : Motivation for fiber optic communication, Introduction to digital modulation, Overview of Optical Communication System
Week 2 : Optical Sources : LED - Working principle, Efficiency, Modulation bandwidth, Emission Pattern, Need for Laser Diodes,       Resonator Concepts 
Week 3 : Optical Sources : Laser Diodes - Resonator, FSR, Q, Single Longitudinal Mode Lasers, Photon Lifetime, Semiconductor
Laser Rate equation, steady state solution, LI characteristics, Output power from laser, Modulation response of LD,Chirp 
Week 4 : Optical Sources- Noise in Lasers- Relative Intensity Noise, Phase noise, Effect of noise on different modulation
schemes, External Modulation- generation of OOK, BPSK, QPSK and 16QAM 
Week 5 : Optical Fibers - Attenuation in fibers, Modes of a step index fiber, b-V curves, Modal profiles 
Week 6 : Optical Fibers- Dispersion in fibers, intermodal dispersion, material dispersion, waveguide dispersion, polarisation mode dispersion 
Week 7 : Photo detectors- PIN and APD Detectors, Sources of Noise- shot noise, thermal noise, NEP, SNR, Heterodyne detectors, SNR in heterodyne detection 
Week 8 : Optical Link Design - Performance Evaluation of an OOK link- BER, Q, Receiver Sensitivity, Optical Amplifiers- EDFA 
Week 9 : Optical Link Design Link Budget, Case Studies, Dispersion COmpensation, Nonlinear Effects- Self Phase Modulation 
Week 10 : Nonlinear effects - Cross Phase Modulation, Four Wave Mixing, Stimulated Raman and Brillouin Scattering, Commonly used components in Optical Networks 
Week 11 : Coherent Detection and DSP : Balanced Detection, Phase and Polarisation Diverse Coherent Detection, Digital Signal Processing for compensation of phase noise, frequency offset, chromatic dispersion, polarisation mode dispersion 
Week 12 : Optical Networks : SDH/SONET Layering, Frame Structure , Physical network topologies, Access Networks- PON ,Optical Interconnects, Data Centers ,Optical communication for Wireless Fronthauling.

Books and references

  1. Fiber Optic Communication Systems by G P Agrawal
  2. Introduction to Fiber Optics by Ghatak and Thyagarajan
  3. Optical Fiber Communications –Principles and Practice by Senior

Instructor bio

Prof. Deepa Venkitesh

IIT Madras
Deepa Venkitesh received the Ph.D. degree from the Indian Institute of Technology Bombay, Mumbai, India, in 2009. She is currently a Professor with the Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai, India. Her research interests include applications of nonlinear optics, optical signal processing for communication systems and fiber lasers. She has authored more than 100 publications in international peer-reviewed journals and conferences. She is a Senior Member of the Optical Society and has been a frequent reviewer of several IEEE and OSA journals. She is currently an Associate Editor for the OSA journal, Advances in Optics and Photonics.

Course certificate

The course is free to enroll and learn from. But if you want a certificate, you have to register and write the proctored exam conducted by us in person at any of the designated exam centres.
The exam is optional for a fee of Rs 1000/- (Rupees one thousand only).
Date and Time of Exams: 29 October 2022 Morning session 9am to 12 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. If there are any changes, it will be mentioned then.
Please check the form for more details on the cities where the exams will be held, the conditions you agree to when you fill the form etc.


Average assignment score = 25% of average of best 8 assignments out of the total 12 assignments given in the course.
Exam score = 75% of the proctored certification exam score out of 100

Final score = Average assignment score + Exam score

YOU WILL BE ELIGIBLE FOR A CERTIFICATE ONLY IF AVERAGE ASSIGNMENT SCORE >=10/25 AND EXAM SCORE >= 30/75. If one of the 2 criteria is not met, you will not get the certificate even if the Final score >= 40/100.

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 Madras .It will be e-verifiable at nptel.ac.in/noc.

Only the e-certificate will be made available. Hard copies will not be dispatched.

Once again, thanks for your interest in our online courses and certification. Happy learning.

- NPTEL team

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