Abstract
A new scheme for lensed fibers with a high focusing power is proposed.
The new lensed fiber has a high-index layer coated (HILC) on a convex-shaped
endface of a single-mode fiber (SMF). Numerical investigation shows that,
by coating a 10-$\mu$m-thick
film with refractive index of 3.7, the lensed fiber can contract the beam
diameter of the propagating mode from 10.4$\mu$m at the wavelength
of 1.55 $\mu$m,
to 1.2 $\mu$m.
The enhanced focusing effect of the lensed fiber has been confirmed experimentally
by coating an $a$-Si:H
film on the lensed endface. The measured focused spot diameter was as small
as 1.6 $\mu$m,
much the same as the wavelength.
© 2009 IEEE
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