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Module 1: Efeitos do Laser Noise e Eletro-Modulação da Fase Optic

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Effects of Laser Noise and Electro-Optic Phase Modulation - Lesson Summary

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The key points from this module are:

The Capacity of a system is based on the signal to noise ratio of the receiver.

Noise is any unwanted signal or random fluctuation of the output parameter.

Phase noise is represented in the frequency domain. It is a fluctuation in phase

Intensity noise is represented in the time domain.

Power spectral density is the Fourier transform of the auto correlation function of normalized power fluctuations.

Some characteristics of phase noise are:

-It is relevant for single-frequency lasers.
- Electric field oscillations are not perfect sinusoids as a function of time.
-Random fluctuations in phase due to
Spontaneous emission
Carrier density fluctuations

Linewidth due to phase noise quantifies variance of the phase fluctuations.

High spectral efficiency system or advanced modulation formats cannot be generated with direct modulation as such, External Modulation is needed.

External modulation is done with Electro-optic modulators.

Drive voltage can be biased at the desired value to change the operating point.

Bias t is an inductor-capacitor circuit which will combine dc and ac.