Modified designs for hollow-core bandgap fibers with suppressed higher-order modes are proposed. Numerical simulations demonstrate that index-matched cladding defects can dramatically increase losses of undesirable modes and leave the fundamental well confined.|Modified designs for hollow-core bandgap fibers with suppressed higher-order modes are proposed. Numerical simulations demonstrate that index-matched cladding defects can dramatically increase losses of undesirable modes and leave the fundamental well confined.

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