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What's optical fiber structure?

Optical fiber structure

The bare fiber is generally divided into three layers:

First layer: high refractive index glass core (core diameter is generally 9-10μm,(single mode) 50 or 62.5 (multi-mode).

The second layer: low refractive index silicon glass cladding in the middle (diameter is generally 125μm).

The third layer: the outermost is a resin coating for strengthening.

1) Fiber core: high refractive index, used to transmit light;

2) Coating: refractive index is low, forming total reflection condition together with fiber core;

3) Protective jacket: strong, can withstand large impact, protect optical fiber.

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