Abstract
The design of bandgap-engineered all-solid photonic bandgap fibers based
on a broken-ring structure is investigated in detail. Both density of states
maps and Bloch mode field distributions are used to show how the bandgap
structure can be engineered and a higher-order gap be greatly expanded by
replacing the high-index germanium-doped rod in a repeating cell with a ring
of several individual high-index rods. The strategy is that both the
azimuthal and radial orders of the cladding LP modes can be controlled by
the broken-ring parameters. In particular, the rod number determines the
highest azimuthal order of the LP mode that is less affected by the
broken-ring, and the bandgap width is largely affected by the rod size. The
result of bandgap engineering is that the higher-order bandgap can be
utilized to design all-solid photonic bandgap fibers with very broad
transmission windows of 488 nm and 944 nm centered at 800 nm and 1550 nm,
respectively, and with typical normal-zero-anomalous dispersion
profiles.
© 2010 IEEE
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