Fabrication of heat-induced long-period gratings for mode conversion in few-mode fibers

Parisah Akrami; Lars Grüner-Nielsen; Lars Søgaard Rishøj; Karsten Rottwitt

doi:10.1117/12.2576686

5 March 2021 Fabrication of heat-induced long-period gratings for mode conversion in few-mode fibers

Parisah Akrami, Lars Grüner-Nielsen, Lars Søgaard Rishøj, Karsten Rottwitt

Proceedings Volume 11713, Next-Generation Optical Communication: Components, Sub-Systems, and Systems X; 1171308 (2021) https://doi.org/10.1117/12.2576686
Event: SPIE OPTO, 2021, Online Only

Abstract

We present recent progress on fabrication of heat induced long period gratings (LPGs) in few mode fibers for stable mode conversion between the fundamental mode LP₀₁ to asymmetric and symmetric modes, such as LP₁₁ and LP₀₂. A simple, effective, and low-cost method is demonstrated for fabricating heat induced LPGs, as an alternative method compared to more complicated approaches that require UV lasers and hydrogen loading or CO₂ lasers. The LPGs are written point-by-point by periodically translating and heating the fiber. The heating filament is realized by conducting electrical current through an omega shaped 0.25 mm electrical platinum wire that enclose the fiber. We expect that the physical mechanisms for the refractive index change are caused by a combination of residual stress relaxation and tapering of the fiber. A grating period down to 622 μm for coupling between the LP₀₁ and LP₀₂ is demonstrated, however, we believe grating periods of a few hundreds of microns are feasible.

Conference Presentation

Citation Download Citation

Parisah Akrami, Lars Grüner-Nielsen, Lars Søgaard Rishøj, and Karsten Rottwitt "Fabrication of heat-induced long-period gratings for mode conversion in few-mode fibers", Proc. SPIE 11713, Next-Generation Optical Communication: Components, Sub-Systems, and Systems X, 1171308 (5 March 2021); https://doi.org/10.1117/12.2576686

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