Dispersion Measurement

Dispersion Measurement material

1. Dispersion
Measurement

By Prof. Hitesh Dholakiya
Engineering Funda YouTube Channel

EEE Runa ASA Optical Communication YT Playlist

2. Outlines

« Basics of Dispersion

Time Domain Intermodal Dispersion Measurement

« Frequency Domain Intermodal Dispersion Measurement
< Chromatic Dispersion Measurement

« Polarization Mode dispersion Mesurement

A Optical Communication YT Playlist

3. Basics of Dispersion

< Three basic forms of dispersion produce pulse broadening of light signals in
optical fibers, which limits the information carrying capacity.

«<* In multimode fibers, intermodal dispersion arises from the fact that each
mode in an optical pulse travels a slightly different distance and thus arrives at
the fiber end at slightly offset times.

“* Chromatic dispersion stems from the variation in the propagation speed of
the individual wavelength components of an optical signal.

«* Polarization mode dispersion arises from the splitting of a polarized signal
into orthogonal polarization modes, each of which has different propagation
speed.

Engineering Funda Android App Optical Communication YT Playlist

4. Time Domain Intermodal Dispersion Measurement
Optical Sampling
Oscilloscope

Fiber Under
test
Optical

Electrical Input

5. Frequency Domain Intermodal Dispersion

Measurement
Spectrum Analyser

Fiber Under
test

Optical

Electrical
Pulse

Electrical Input

6. Chromatic Dispersion Measurement

Display

Electrical =
Phase Comparator Relative Group
Source
Delay
Modulating 4
Signal Photo

Receiver

Fiber Under
Test

Narrowband Intensity
Optical Modulator

Source Wavelength Meter

Dispersion

7. Polarization Dispersion Measurement

Broadband Polarizer Polarizer Optical
Optical E me) q Spectrum
Source Ge. neer Analyzer

Test