Course108106167116 lectures
Fiber Optic Communication Technology
Prof. Deepa Venkitesh · IIT Madras
About
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.
INTENDED AUDIENCE : Any Interested Learners
PREREQUISITES : Signals and Systems
Lectures
Week 1
- Introduction to FOCT: Prerequisites, Course Content and Learning Outcomes
- Communication through the ages
- Communication: Basics 1
- Communication: Basics 2
- Digital Communication for Optical Communication
- Digital modulation: Basics 2
- Digital modulation: Basics 3
- Optical communication system
Week 2
- Optical Sources
- Semiconductor gain media- structure, spectrum
- Optical sources: LED
- External Quantum Efficiency
- Modulation Bandwidth of LED
- Optical and Electrical Bandwidth of LED
- Emission Pattern of LED
- Optical Sources: Laser Diodes over LEDs
- Laser Diodes: Resonator Concepts 1a
- Laser Diodes: Resonator Concepts 1b
- Laser Diodes: Resonator Concepts 1c
Week 3
- Laser Diodes: Gain Coefficient
- Laser Diodes: Photon life time
- Laser rate equation: Steady State solution1
- Laser rate equation: LI Chara
- Laser power derivation
- Modulation Response of Laser 1
- Modulation Response of Laser 2
- Modulation Response of Laser 3
- Setbacks of direct modulation of laser: Modulation Chirp
- Setbacks of direct modulation of laser: Transcient Chirp
Week 4
- Recap of Consequences of Direct Modulation
- Noise in Lasers
- Relative Intensity Noise
- Laser Phase Noise 1
- Laser Phase Noise 2
- Effect of Laser Phase Noise: A case study
- Electro-optic phase modulation
- Electro-optic intensity modulator
- Biasing of MZM: BPSK Generation
- Biasing of MZM: QPSK and 16 QAM Generation
- Line coding schemes and their bandwidth requirements
Week 5
- Introduction to optical Fiber
- Attenuation in optical fibers
- Fiber Modes
- Modes of a step index fiber 1
- Modes of a step index fiber 2
- Modes of a step index fiber 3
- Modes of a step index fiber 4
- Modes of a step index fiber 5
- Modes and Cut-off conditions
- Universal b-V curves
- Modal Profiles in step index fiber
- Mode Field Diameter
Week 6
- Dispersion- Intermodal dispersion derivation
- Dispersion-Bit rate distance Product
- Phase Velocity and Group Velocity 1
- Phase Velocity and Group Velocity 2
- Material dispersion
- Waveguide dispersion
- Total Dispersion in optical fiber
- Polarization mode dispersion
Week 7
- Photodetectors concepts
- p-n & p-i-n Photodetectors
- Avalance Photodetector
- Direct detection receiver and sources of noise
- Quantifying noises in direct detection receivers
- SNR and Operation Regimes
- Noise Equivalent power and SNR in APDs
- Coherent Receivers
- SNR analysis of coherent receivers
Week 8
- Performance Evaluation 1
- Performance Evaluation 2
- Performance Metrics: BER,Q, and Receiver Sensitivity
- Performance Metrics:Q and SNR
- Quantum limit of photodetection
- Optical Amplifier
- Erbium doped fiber amplifier 1
- Erbium doped fiber amplifier 2
- Erbium doped fiber amplifier 3
- Erbium doped fiber amplifier 4
Week 9
- Link Design - Rise Time Budget
- Link Design- Case Study
- Link Design- Passive Optical Network and long haul link
- Dispersion - recap
- Dispersion Compensation - Pulse Propagation with disperison
- Pulse propagation -2
- Dispersion Compensation -Dispersion Transfer Function
- Dispersion Compensation -Case Study
- Dispersion COmpensation - WDM & DSP
- Nonlinear Effects- Nonlinear refractive Index
- Self Phase Modulation
Week 10
- Cross Phase Modulation
- Scattering Processes in optical fibers
- Stimulated Brillouin Scattering
- Stimulated Raman Scattering
- Components- Directional Couplers
- Components - VOA, Polariser, Polarisation Controllers
- Components- Isolator
- Components - Circulator, Definitions
- Components - Wavelength filters
- Components - Arrayed Waveguide Gratings, WSS
Week 11
- Balanced Detection
- Polarisation Diverse Coherent Receiver
- Phase and Polarisation Diverse Coherent Reciever
- Overview of impairments in coherent optical communication
- Transceiver impairments - Generation and Compensation
- Channel Impairments - Generation and Compensation
- Demo video
Week 12
Syllabus and materials
At NPTEL, as the course publishes them.
Credits and licence
- Institution
- IIT Madras
- Department
- Electrical Engineering
- Teacher
- Prof. Deepa Venkitesh
- Level
- Undergraduate
- Language
- English
- Subjects
- Engineering
- Source
- NPTEL
- Licence
- CC BY-NC-SA, as NPTEL states it. Non-commercial use only. NPTEL's terms
- Attribution
- NPTEL states: "Distributed under Creative Commons Attribution-ShareAlike / CC BY - NC - SA", beside a BY-NC-SA badge.
- Who can watch
- NPTEL gives no rating. Invisible Network shows it to Tweens profiles and older, judged from what the source says about it. How courses are placed
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