Abstract
In this paper, we theoretically design and numerically
demonstrate a large mode area and single-mode erbium-doped photonic crystal
fiber (PCF) amplifier operating in the S-band with a complete suppression
of amplified spontaneous emission (ASE) and very low Raman gain coefficient
at 980-nm pump. The proposed fiber design is based on a dual-concentric core
refractive index profile and is solved through full-vectorial finite-element
method. Numerical simulations reveal that more than 50 dB of gain can be achieved
with a mean gain value of 27 dB over 70-nm bandwidth in a 7.2-m-long fiber.
The effect of bending on the amplification characteristics has been noted.
It has been shown that by a proper choice of the PCF profile parameters, the
fiber amplifier can be made bend-insensitive for a bending radius as small
as 5 cm. Further, our design guidelines should be useful to achieve a functional
bend-insensitive fiber amplifier, where rack space is a premium and tight
bending radius becomes inevitable.
© 2009 IEEE
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