Two-dimensional optical power distribution of side-out-coupled radiation from tilted FBGs in multimode fibre |
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Authors: | Zhou K Simpson G Chen X Zhang L Bennion I |
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Affiliation: | Photonics Res. Group, Aston Univ., Birmingham, UK; |
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Abstract: | Two-dimensional optical power distribution of the out-coupled radiation from UV-inscribed tilted fibre Bragg gratings (TFBGs) in multimode fibre (MMF) has been side-detected with high spatial/spectral resolution, showing a near-identical radiation mode profile to that measured from the fibre-end detection method. A comparative investigation of the radiation characteristics of TFBGs fabricated in singlemode fibre (SMF) and MMF clearly indicates that the radiation out-coupling is stronger and spatially more confined in MMF. The unique spatial-to-spectral encoding property of the coupling mechanism offers potential application in low-cost WDM devices. |
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