Abstract
In this paper, a confinement loss diagram (CLD) is proposed as a novel
design tool for Bragg fibers. The CLD is a 2-D pseudocolor diagram, which
presents the loss properties of a Bragg fiber in a coordinate of normalized
frequency and the effective refractive index (<i>ω<sub>r</sub>, n<sub>eff</sub></i>), to quantitatively characterize the Bragg cladding without the
parameters of the core. The CLD is derived from a ray reflection model,
which describes the propagation in Bragg fibers as reflection and ray
trajectory. Confinement loss is first determined from the reflection process
and then developed into a 2-D CLD. In this paper, the confinement loss
calculation with the ray reflection model is first shown to be accurate for
Bragg fibers with a core radius as small as 0.8 wavelength, both in the TE
modes and the TM modes. Then, the CLD is exploited to characterize the level
core Bragg fiber and the depressed core Bragg fiber. It is found that the
level core fiber is suitable for wide band designs, while the depressed core
fiber is good for narrow band designs. Lastly, the CLD is applied to
characterize the loss properties of different order bandgaps, so that the
propagation region can be located for optimum Bragg fiber design.
© 2010 IEEE
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