A diffusion barrier attached to the cladding layer prevents significant diffusion of a Raman active gas out of the holes in a holey fiber or photonic band gap fiber.

Eine Diffusion (Zerstäubung) Sperre, die zur Umhüllungschicht angebracht wird, verhindert bedeutende Diffusion (Zerstäubung) eines Raman aktiven Gases aus den Bohrungen in einer holey Faser oder in der photonic Bandabstand Faser heraus.
 
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