What question did this study set out to answer?

The research aims to analyze the performance of a directional coupler in K8 glass, focusing on optical power transfer.

March 1, 2026

Directional Coupler Based on Waveguides with a Structured Depressed Cladding in K8 Glass

VLV. V. LikhovFiber Optics Research Center GAG. K. AlagashevFiber Optics Research Center AOA. G. OkhrimchukFiber Optics Research Center

Puntos clave

The research aims to analyze the performance of a directional coupler in K8 glass, focusing on optical power transfer.
Proposed a directional coupler architecture using curved single-mode waveguides.
Utilized a femtosecond laser beam to write DCs in the bulk of K8 glass.
Conducted experimental and theoretical studies on power transfer in the telecommunication wavelength range.
Maximum optical power transfer reached 56%.
Power transfer was limited by the asymmetry of the directional coupler arms.
Modal propagation loss was measured at 0.8 dB/cm.

Resumen

A directional coupler (DC) architecture consisting of curved single-mode waveguides with a structured depressed cladding was proposed. The DCs were written in the bulk of industrial borosilicate K8 glass using a femtosecond laser beam. The dependence of the optical power fraction transferred between the DC arms in the telecommunication wavelength range on the length of the coupling section was experimentally and theoretically studied. The maximum fraction of transferred power was 56% and was found to be limited by the asymmetry of the DC arms. The modal propagation loss was as low as 0.8 dB/cm.

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