Abstract
We demonstrate that higher order bandgaps in all-silica Bragg fibers
can have modes with four orders of magnitude lower confinement loss than those
using the fundamental bandgap. A scheme for exploiting the higher order gaps
for any specific wavelength via a global scaling of the fiber geometry is
proposed. This approach provides lower losses than by reducing the confinement
loss of the fundamental gap by scaling the core. Using a variety of modeling
techniques, we have examined the band structure and guidance of idealized
air-core all-silica Bragg fibers. It is demonstrated that the higher order,
low loss, bandgaps analyzed here are uniquely accessible to single-material
Bragg fibers, and are fundamentally different from the higher order gaps typically
associated with depressed-index Bragg fibers such as the “Omniguide”
fibers. Further analysis suggests that some of the key features of the guided
modes of Bragg fibers can be understood by considering the properties of single
hollow-core homogeneous dielectric waveguides (“boreholes”).
© 2007 IEEE
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