Abstract
This paper describes a fiber design that incorporates a hole-assisted
structure for suppressing stimulated Brillouin scattering (SBS). The proposed
hole-assisted fibers (HAFs) have a simple structure with a low relative index
difference and/or a small core radius. We suppress the SBS by extending the
optical field into the cladding region, which reduces the overlap between
a lightwave and an acoustic wave both in the fundamental mode. The bending
loss remains low because of the optical field confinement provided by the
air holes. We discuss the impact of the core profile on the SBS gain spectrum
and show numerically a 13.5 dB improvement
in the SBS threshold with both a low SBS gain and a large effective area.
Moreover, we show that we can realize SBS suppressed HAF with a low bending
loss and almost the same mode field diameter as SSMF by designing the air
hole structure. Finally, we experimentally confirm the SBS suppression effect
by using the fabricated HAF.
© 2009 IEEE
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