| http://www.w3.org/ns/prov#value | - Preferably, the material of the overclad tube or housing is made from the same or similar cladding material, such as boron doped silica. [0129] Thus an initially rectangular multimode waveguide 342 can be transformed by tapering or otherwise coupling to a single-mode or a few-mode waveguide 40 of substantially circular geometry and with a reduced NA. This method has been successfully employed in t
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