Re: Multimode-Singlemode fiber coupler

Dendrites wrote:
Thank you very much Louis!

I know what you mean. You think the coupler is just simply joining the
multimode fiber and singlemode fiber together. But would it be possible
that we could use some optical technology to compress or direct the
light from the multimode fiber efficiently into the singlemode fiber,
that is the meaning why such a multimode-singlemode fiber coupler may
exist.

I don't think such a device is theoretically possible after the light gets scrambled in the multimode fiber though I can't prove it mathematically. Basically once the clean wavefront is broken up it can't be put together again. Not by all the king's horses and all the kings men.

I fully agree with Phil Hobbs advice to start with single mode fiber and stick with it. The technology to launch laser light into a single mode fiber is mature, well documented, and because of all of the communications equipment which uses it, relatively cheap. It's even available on the surplus market where it's very cheap.
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Relevant Pages

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