Optical Modulation | Principles and Methods

This video defines optical modulation as the process of converting high-frequency electrical data into light signals for transmission through fiber optic cables.

The video describes two primary techniques: direct modulation, where the light source's current is adjusted directly, and external modulation, which utilizes separate components to modify a steady beam. While direct modulation is simpler, it is limited to lower speeds due to signal distortions known as chirping.

Conversely, external methods like the Mach Zehnder Modulator or electro-absorption modulators are preferred for high-speed data rates exceeding 10 Gbps. These specialized devices manipulate light through either phase interference or material absorption to represent digital information.

Overall, the material provides a technical comparison of how different hardware configurations facilitate efficient optical communication.

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