all of CHI's products involve draw towers, on which we create our
own optical fibers. The towers are also used to generate other critical
components -- such as redrawn tubes, rods, etchable capillaries,
and structures with custom cross-sections. Drawing our own material
provides the flexibility to customize fibers and capillaries to
meet diverse needs.
draw process for a typical fiber is relatively straightforward.
A glass assembly, consisting of a high-index glass rod inside of
a lower-index glass tube, is suspended vertically above an oven
into which it is lowered slowly. Once inside the heat zone, the
lowest part of the glass softens and is pulled from below at a rate
exceeding that of the feed into the oven. Mass in must equal mass
out, which means that the cross-sectional area of the glass being
pulled out of the oven must undergo a reduction to allow for the
increase in length caused by the pull. This reduction can be described
mathematically, and can be precisely controlled by the proper selection
of the feed and draw rates. Thus, we can create fibers of practically
any diameter from a core/clad combination of greater size.
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