Design, laser direct writing prototyping, and characterization of fan-out diffractive optical elements for optical interconnect applications

A. Kyriazis; K. Vanmol; G. Y. Belay; H. Thienpont; J. Van Erps

doi:10.1117/12.2620785

20 May 2022 Design, laser direct writing prototyping, and characterization of fan-out diffractive optical elements for optical interconnect applications

A. Kyriazis, K. Vanmol, G. Y. Belay, H. Thienpont, J. Van Erps

Author Affiliations +

Proceedings Volume 12135, 3D Printed Optics and Additive Photonic Manufacturing III; 1213505 (2022) https://doi.org/10.1117/12.2620785
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Abstract

We present the design, fabrication, and characterization cycle of a diffractive optical element based layout, used for 1-to-7 power splitting of a Gaussian beam emitted by a single-mode fiber. First, a modified version of our earlier demonstrated mode conversion up-taper structure is designed, fabricated, and characterized, increasing the mode-field diameter of the fundamental mode by a factor of 2. Then, a newly designed diffractive optical element is optimized to convert the expanded field distribution to a seven Gaussian-spot hexagonal array with 45 μm spacing, at an optimal propagation distance of only 61 μm, achieving splitting in a non-paraxial diffraction regime. The two components are combined into a monolithic design encompassing both adiabatic field expansion and efficient phase modulation in a single, highly miniaturized component. The power splitter is fabricated directly on the cleaved facet of a single-mode fiber, in a single step, using direct laser writing based on twophoton polymerization. The small spatial extent of the power splitter allows for a highly compact, integrated solution for wide-angle, fan-out power splitting of a Gaussian beam in single-mode interconnect and sensing applications.

Conference Presentation

Citation Download Citation

A. Kyriazis, K. Vanmol, G. Y. Belay, H. Thienpont, and J. Van Erps "Design, laser direct writing prototyping, and characterization of fan-out diffractive optical elements for optical interconnect applications", Proc. SPIE 12135, 3D Printed Optics and Additive Photonic Manufacturing III, 1213505 (20 May 2022); https://doi.org/10.1117/12.2620785

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