Bonn 2025 – wissenschaftliches Programm
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 4: Photonics (3D Print) (joint session Q/K)
K 4.7: Vortrag
Montag, 10. März 2025, 18:30–18:45, HS V
Broadband Mode Division Multiplexing of OAM-Modes by a Micro Printed Waveguide Structure — •Julian Schulz1 and Georg von Freymann1,2 — 1Physics Department and Research Center OPTIMAS, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany — 2Fraunhofer Institute for Industrial Mathematics ITWM, 67663 Kaiserslautern, Germany
To utilize the orthogonal mode space of OAM-modes to increase the amount of information throughput for optical fibers, an efficient and compact device to create, superimpose and to decompose OAM-Modes is needed We present as a proof of principle a waveguide structure, which transformations the eigenmodes from spatially separated single mode waveguides adiabatically into modes of a ring waveguide carrying |OAM| ≤ 2. In an adiabatic evolution, the population of the eigenmodes remains constant while the eigenmodes change according to the system. Two mechanisms are utilized to maintain the propagation constants of each individual mode consistently spaced during the propagation thou the structure: Individual waveguides are detuned by changing their radius and an artificial magnetic field is introduced by twisting the structure. The inherent tolerance of an adiabatic evolution allows our device to operate effectively across a wide spectrum of wavelength. Besides that, it can also be used as a demultiplexing structure, if the adiabatic evolution is run backwards. We demonstrate the capabilities of the structure with BPM-simulations and experiments with a polymer waveguide structure fabricated via direct laser writing. [Advanced Optical Materials 12, 2302597, (2024)]
Keywords: waveguide; fiber; OAM; photonic lantern; adiabatic