Large-core Fibers

A large-core fiber is an optical fiber having a fiber core which is relatively large. It can be a multimode fiber or a single-mode fiber.

Large-core multimode fibers have a core diameter which is well above the typically used 50 μm or 62.5 μm – for example, 100 μm or even 400 μm.

Figure 1: Comparison of bare (uncoated) fibers with a standard core size (e.g. 8 μm diameter) and a large core (50 μm diameter).

If a large-core fiber is a single-mode fiber, it also has a large effective mode area. Here, the term large mode area fiber is more common and more appropriate, since the large mode area is a particularly important property: it results in reduced nonlinear effects combined with a high beam quality.

See also: fibers, large mode area fibers, effective mode area
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