1 February 2014 All-fibre mode multiplexers
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Abstract
We made two types of three-mode multiplexers with three single-mode input cores and one enlarged output core. Light in each input core evolved adiabatically into just one of the LP01, even-LP11 and odd-LP11 modes of the output core. In the first type, the transition between inputs and output was formed by the controlled collapse of selected holes in a photonic crystal fibre with three cores in an equilateral triangular array. In the second type, three standard single-mode fibres were made dissimilar and tapered together within a fluorine-doped silica capillary. In both cases the output light patterns matched the LP01 and LP11 distributions as expected, with broadband operation across at least 100 nm in the near-IR, low insertion losses and mode purities exceeding 10 dB.
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T. A. Birks, T. A. Birks, S. Yerolatsitis, S. Yerolatsitis, I. Gris-Sánchez, I. Gris-Sánchez, "All-fibre mode multiplexers", Proc. SPIE 9009, Next-Generation Optical Communication: Components, Sub-Systems, and Systems III, 90090M (1 February 2014); doi: 10.1117/12.2042149; https://doi.org/10.1117/12.2042149
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