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    The picture illustrates what is fiber? Classification of optical fibers?

    Post time: Mar-27-2020

    1.optical fiber core structure

    001

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

    2) Cladding: low refractive index, forming a total reflection condition with the core;

    3) Protective layer: protects the optical fiber.
    002

    2.Single-mode and multi-mode

    003

    Only one mode of light can be transmitted. Therefore, its inter-mode dispersion is small and suitable for remote communication, but there are also material dispersion and waveguide dispersion. In this way, single-mode fiber has higher requirements for the spectral width and stability of the light source, that is, the spectral width must be narrow and the stability Better. Single-mode fiber has zero total dispersion.

    004

    Can transmit multiple modes of light. However, its inter-mode dispersion is large, which limits the frequency of transmitting digital signals, and it will become more serious with increasing distance. Multi-mode fiber transmission distance is relatively short, generally only a few kilometers.

    Single-mode equipment can usually run on single-mode fiber or multi-mode fiber, while multi-mode equipment is limited to running on multi-mode fiber.



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