Abstract
Step-index (SI) fiber designs are commonly used in achieving large mode
area (LMA) and single-mode (SM) operation in fiber lasers. These fibers can
either be intrinsically single-moded fibers or few-moded fibers, which can
be forced into SM operation through bending. In this paper we evaluate the
limitation of the effective area for SM operation by taking into account the
effects of practical constraints such as fiber bending loss, laser
performance, and fiber mechanical reliability on these LMA fiber designs. It
is shown that the effective area of these fibers cannot be arbitrarily
scaled up with the size of the fiber core. We also use the modeling result
to provide estimated upper limits to the core diameters and corresponding
effective areas for conventional SI fiber designs taking into account fiber
parameters that are achievable nowadays.
© 2009 IEEE
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