Media for Fiber Core Imaging

Fiber Core Imaging

Hi:

Can a fiber core be imaged down by a factor of 10, the idea is to make a large core ( 100 um) appear as close as to a point source.

I thought I could make reverse beam expander (1/10 reduction) using two aspheres and image the fiber core (located at focal point of the first lens). I couldn't find comerical lenses that could do this, because of the fiber NA (~0.2) the first lens dia. is large (depending on the selected focal length) and the second lens dia. because of its shorter focal length is small not being able to collect light coming out of the first lens.

Is there a way to do this?

thanks