La performance d’une liaison optique

A fibre optic network provides a certain speed. This criterion will depend on the length of the network, the type of fibre chosen (single mode or multimode optical fibre) and the class of the latter (example: for multimode fibre 50/125μm: OM1, OM2, OM3 or OM4).

When designing the network, it is important to limit the losses associated with each event. Indeed, the latter influence the performance and durability of the network as well as its future extensions.

Here are some examples of expected values:




Inadequate manufacture of optical cables or inappropriate installation can also be a factor in losses. It is important to pay attention to the bending radii of optical fibres (cords and cables) which are sources of attenuation if they are not respected.

In addition to optical performance, it is also important to respect the mechanical characteristics of the cables, such as tensile strength. Indeed, failure to comply with them can cause damage to the internal structure and consequently risks of breakage for the optical fibre.
For high speed installations, fiber intrinsic parameters such as PMD (polarization mode dispersion) and/or CD (chromatic dispersion), may also limit the flow rates.

The performance of a fiber optic installation is also dependent on its identification. Very important, it facilitates and optimizes future manipulations such as derivations, network extensions... Not being able to quickly determine the ends of a fiber implies a waste of time in the search for this information.

This criteria is important enough today to have led to the development of optical network management software. These allow the entire network to be mapped.

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