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Robust evanescent fused tapered couplers

Robust evanescent fused tapered couplers

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In the ubiquitous fused tapered coupler the two processes of fusing and tapering are achieved in a single processing step. This leads to a longitudinal variation in the coupler cross-section, from a figure-of-eight at the extremities to anything between this figure-of-eight and a full circle at the middle of the taper waist. Through separation of the fusing and tapering processes, a new coupler type is reported. This coupler has a predominantly evanescent mode of coupling being shorter and fatter (more robust) than its conventional tapered counterpart.

References

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      • M.J.F. Digonnet , H.J. Shaw . Analysis of a tunable single mode optical fiber coupler. IEEE J. Quantum Electron. , 4 , 746 - 754
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      • C.V. Cryan , C.D. Hussey . Fused polished singlemode fibre couplers. Electron. Lett. , 2 , 204 - 205
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      • A.W. Snyder , J.D. Love . (1983) Optical waveguide theory.
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