Fiber Cladding

Fiber Cladding

  • 2021-08-05

An optical fiber usually has some kind of fiber core. The area around the core is then called the fiber cladding.

Figure 1: Light can be launched into the core of a fiber, which is surrounded by the cladding.

For fibers which are not simple step-index fibers, but have a more complicated refractive index profile, one usually considers the cladding to be only the area where the refractive index starts to stay constant – up to the outer cladding radius, where one may have air or some polymer coating, for example.

For single-mode fibers, the cladding usually covers a much larger area than the core, but for some multimode fibers the opposite may be true.

Usually, the cladding is fabricated together with the fiber core by pulling from a fiber preform.

Cladding Diameter

The diameter of a fiber cladding is often chosen to be 125 μm, which is a standard value. Although it is often irrelevant concerning the guiding properties, it can nevertheless have a substantial practical importance:

When fibers are made thicker, they more easily break when one tries to bend them. However, increased cladding diameters are sometimes necessary, e.g. for high-power devices or for multi-core fibers with a larger number of cores.

Fusion splicing and mechanical splicing are usually difficult when the two fibers have different cladding diameters. There are special solutions, however, for such cases.

Shinho Fiber Communication Co., ltd as the leading manufacturer of Fiber Fusion Splicer has developed the latest machine that can splice 125μm- 400μm fibers with low loss( different cladding diameters such as 125μm to 250μm are also ok). If you want more info, please contact me freely.

© Droit d\'auteur: Shanghai Shinho Fiber Communication Co., Ltd. Tous droits réservés.


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