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Module 1: Dispersão Total em Fibra Optical

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Total Dispersion in Optical Fiber - Lesson Summary

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The key points from this module are:
A Gaussian Mode is an Eigen mode of free Space at every cross-section.

We need Greater index fiber to minimize dispersion.

Dispersion means the spread in Time domain of pulses when it propagates through a fiber.

Possible reasons for Dispersion in fibers:
The different velocity of the modes
Source has a different wavelength so different colours propagates at different speeds- material dispersion
Different modes take different ray paths- Intermodal dispersion
Waveguide dispersion

Bit rate allowed spread should be less than the bit slot

When Cladding is added bit-rate distance product increases.

Waveguide dispersion happens because light travels in both the core and cladding of a single-mode fiber. This arises because of the effective velocity, the waveguide dispersion, changes with wavelength.

Zero residual dispersion leads to an enhancement in the non-linear properties

Residual dispersion results in a walk, therefore, reduces the efficiency of generation of FWM products.

Polarization mode dispersion is a form dispersion where two different polarizations of light in a waveguide, which normally travel at the same speed, travel at different speeds due to random imperfections, hence causing random spreading of optical pulses.