Fabricated from single-mode optical fiber, novel tapered
structures compensate for dispersion and provide non-linearity in laser systems.
With doped optical fiber, a new class of compact,
inexpensive mode-lock fiber lasers can be built. With tapered structures of
doped PM (polarizing maintaining) fiber, a PM mode-locked fiber laser can be
fabricated. This design is advantaged over alternative solutions because
it is an integrated structure which is fusion spliced at both ends.
The concept can also be applied in an optical amplifier,
in which the doped fiber is tapered to provide the dispersion compensation and
the laser is pumped in an un-tapered region of the fiber or by using pump light
from each end.
In a conventional fiber laser, complex external optical
elements, such as intra-cavity prism pairs, are needed to compensate for the
normal dispersion of the fiber. With this new technology, tapered
structures are built into the doped fiber itself so that the ?anomalous?
dispersion compensates for the ?normal? dispersion of the fiber. The laser then
becomes much more compact and inexpensive by eliminating the large components
and the labor required to align them.
See also the related UR technology no.
2-11150-05017, on a fiber laser super-continuum light source built using this
kind of device.