| http://www.w3.org/ns/prov#value | - In an embodiment, the tapering of the PCF (i.e. change of the maximum cross sectional dimension of the multimode core region) occurs over a length of the PCF in the range of 0.1 m to 10 m, such as over 0.2 m to 5 m, such as over 0.5 m to 0.1 m.
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