Optical Communications

By Prof. Pradeep Kumar   |   IIT Kanpur
Learners enrolled: 1573
Optical communications is a frequent elective/core course offered to third/final year undergraduate students in Electrical Engineering. This course offers a gradual approach to optical communications with emphasis on latest developments in coherent optical communications. Starting from a broad introduction to transmitters and receivers, this course covers optical fibers and waveguides, lasers, detectors, optical amplifiers, channel impairments and their mitigation using signal processing algorithms. Matlab models will be discussed.

PRE-REQUISITES        : Knowledge of electromagnetics and digital communication fundamentals
INDUSTRY SUPPORT  : Tejas Networks, Sterlite Technologies, Many defense labs, etc
Course Status : Ongoing
Course Type : Elective
Duration : 12 weeks
Start Date : 18 Jan 2021
End Date : 09 Apr 2021
Exam Date : 24 Apr 2021
Enrollment Ends : 01 Feb 2021
Category :
  • Electrical, Electronics and Communications Engineering
  • Photonics
Level : Undergraduate

Course layout

Week 1: Overview of optical fiber communications, Optical transmitter components--lasers and optical modulators
Week 2: General digital communication system, Line coding and Pulse shaping, Signal space representation
Week 3: Digital modulation formats: ASK, PSK, and QAM, Matlab models, Optical implementation, Matlab models
Week 4: Higher-order modulation (star and square QAM) and Multicarrier modulation (OFDM), Optimum receiver principles
Week 5: Optical receivers I: Photodetectors and its performance characteristics, noise in photodetection, common types of photodetectors
Week 6: Optical receivers II: Direct detection, self-homodyne (differential) detection, and coherent detection, Sensitivity, Impact of noise
Week 7: Lasers, rate equations, RIN and phase noise
Week 8: Optical amplifiers: EDFA and SOA, ASE, system impact
Week 9: Electromagnetic theory, Wave equations, Reflection and transmission of waves
Week 10:Optical fiber modes, single and multi-mode fibers, single and multi-core fibers, attenuation and dispersion
Week 11:Nonlinear effects (SPM, XPM, FWM), Multiplexing: Polarization, Wavelength, and Time division multiplexed systems, Important WDM components
Week 12:DSP in optical communications, dispersion mitigation, phase noise estimation and compensation, carrier phase recovery, digital back propagation

Books and references


Instructor bio

Prof. Pradeep Kumar

IIT Kanpur
Dr. Pradeep Kumar K. obtained his PhD from IIT Madras specializing in quantum cryptography. He joined the Department of Electrical Engineering at IIT Kanpur in 2009. He is also associated with the Centre for Lasers & Photonics. At IIT Kanpur he and his students work in the fields of quantum key distribution, nonlinear fiber optics for signal processing, mitigation of linear and nonlinear impairments in coherent optical communications, mode locked fiber lasers and chaos, fiber-optic sensors for undersea applications, and fiber-optic modeling. He is also actively involved in the LIGO-India effort under IndiGO umbrella. His lab develops single-photon detectors, single- and subcarrier RF transceivers, and is currently working on true random number generators. He has published over 40 papers in peer reviewed journals and conferences. He also holds three patents (one granted and two pending). His MOOC courses on NPTEL has been very popular with more than 15000 enrollments from across the country.

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: 24 April 2021 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 Kanpur .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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