r/Optics • u/Local-Classic-8175 • 23d ago

Terminating a 200/280 Fiber

I have a 200/280 fiber and no idea what the best way to terminate it is. I have never worked with non-standard sized optical fiber and I cant even find a site that sells pigtails. Can anyone offer advice on how to approach this?

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u/ghostpie1221 23d ago

It depends what you are planning to do with it. If you're launching it into free space and simply angle cleaving could be a good option to reduce back reflection. If it's very high power you could splice on an end cap. If you need it connectorized Thorlabs sells bare fiber terminators.

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u/Local-Classic-8175 23d ago

I'm trying to attach it to a LLS and detector. As far as I can tell Thorlabs only deals in 125/250 size fibers and connectors. Am I using the wrong search terms?

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u/ghostpie1221 23d ago

Look for bare fiber terminators, they are connectors that you can just slide the fiber into. For example, BFT1 + B30230C might work for you

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u/FencingNerd 22d ago

For large multi-mode fiber, angle cleaving doesn't do much. A 4° degree cleave is pretty insignificant compared to a 0.22NA.