| 摘要 |
The invention relates to an optical fibre (1) having a longitudinal direction and a cross section perpendicular thereto. The optical fibre (1) comprises a microstructure that comprises a core region (2), a cladding region surrounding said core region (2), and a number of axially oriented cladding elements (4), such as longitudinal extending holes, located in the cladding region, each having a cross-sectional dimension (d), such as a diameter. The optical fibre (1) has at least one longitudinally extending transition region (6) having a first end (7) and a second end (8), wherein the cross-sectional dimension of the individual cladding elements (4) changes from a first cross-sectional dimension (d1) at the first end (7) of said transition region (6) to a second cross-sectional dimension (d2) at the second end (8) of said transition region (6). The mutual perpendicular distance between said at least two cladding elements (4) changes from a first distance (A1) at the first end (7) of said transition region to a second distance (A2) at the second end (8) of said transition region. The optical fibre (1) exhibits a photonic bandgap effect in said at least one transition region.
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