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.
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.
The RP Photonics Buyer's Guide contains 10 suppliers for large-core fibers. Among them:
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