Splice optimisation between dissimilar fibres in the presence of dopant diffusion

Vincenzo Scarnera; Christophe A. Codemard; Mike Durkin; Michalis N. Zervas

doi:10.1117/12.3003118

12 March 2024 Splice optimisation between dissimilar fibres in the presence of dopant diffusion

Vincenzo Scarnera, Christophe A. Codemard, Mike Durkin, Michalis N. Zervas

Proceedings Volume 12865, Fiber Lasers XXI: Technology and Systems; 1286515 (2024) https://doi.org/10.1117/12.3003118
Event: SPIE LASE, 2024, San Francisco, California, United States

Abstract

In this work, we optimize singlemode-to-multimode doped fiber splices by varying the arc duration and monitoring HOM excitation, using the standard S² technique. By measuring the diffused Refractive Index Profile (RIP) distributions around the splice point, contrary to current belief, we show that the optimum arc duration does not corresponds to RIP that match the MFDs on either side of the splice point. Furthermore, we show that the MM doped fiber diffused RIP is longitudinally non-adiabatic and results in additional power transfer from the excited FM (LP₀₁) to HOMs (LP₀₂). As a result, we find that the optimum arc duration corresponds to a substantial MFD mismatch which results in an initial excitation of the HOM (LP₀₂) with the appropriate magnitude and relative phase to nullify the corresponding HOM power generated in the non-adiabatic region.

Conference Presentation

Citation Download Citation

Vincenzo Scarnera, Christophe A. Codemard, Mike Durkin, and Michalis N. Zervas "Splice optimisation between dissimilar fibres in the presence of dopant diffusion", Proc. SPIE 12865, Fiber Lasers XXI: Technology and Systems, 1286515 (12 March 2024); https://doi.org/10.1117/12.3003118

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