Fiber to Fiber Coupling

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We'd like to image the output face (the core area) of a fiber onto the
input face (core) of an identical
fiber with the highest coupling efficiency possible. The wavelength is
800 nm.  What is the best method to achieve this?

I could think of the following two.

1- Use double aspheric (two identical aspheres) with NA equal to the
fiber's NA.

2-Use a single imaging GRIN lens that has the same NA as that of the
   Can GRIN lens handle high power light i.e. keep its refractive
index profile intact?

Appreciate your comment and suggestions.


Re: Fiber to Fiber Coupling

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It is done by splicing the fibers, not by lens coupling.


Re: Fiber to Fiber Coupling
Farsang wrote:
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You don't say what is on the ends of your fiber.
Best (lowest loss); fusion splice
Good; connectorize both ends with point contact angled connectors which
creates a direct physical contact between the two
Okay 1; mechanical splice
Okay 2 (very lossy and a pain in the butt to get the fill factor right);
using some sort of lens configuration to get light out of one fiber and
focused into the other

P. Danek

Re: Fiber to Fiber Coupling
Siecor made a mechanical splice but it's not for a permanent installation.

A fusion splicer will give you the best throughput for a permanent

No connectors necessary.  Just fuse the fiber together when they are
perfectly aligned.

Re: Fiber to Fiber Coupling
Do a google search on "fusion splicers".

Maybe you can rent one.

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