Coupling strategies for integrated photonics: advances and opportunities

Benedikovic, Daniel, Fraser, William, Korček, Radovan, Medina Quiroz, David, Dominguez Bucio, Thalia, Gardes, Frederic, Wilmart, Quentin, Jaššák, Jozef, Gonda, Matej, Litvík, Ján, Glesk, Ivan, Petrovič, Adam, Pikulíková,, Viktória, Šajban, Matej, Edmond, Samson, Cheben, Pavel, Schmid, Jens H., Alonso-Ramos, Carlos, Vivien, Laurent and Ye, Winnie N. (2025) Coupling strategies for integrated photonics: advances and opportunities. Pudis, Dusan, Jandura, Daniel and Lettrichova, Ivana (eds.) In 23rd Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics. vol. 13508, SPIE. 5 pp . (doi:10.1117/12.3056424).

Abstract

Integrated photonics is envisioned as a key enabler for numerous emerging applications, including high-speed communications, ultra-fast optical computing, and quantum information processing. These applications call upon efficient connection between the sub-micrometric planar photonic waveguides and standard optical fibers (SMF-28). Fiber-to-chip optical interfacing has always been recognized as an issue of fundamental importance in the field of integrated photonics, particularly by imposing a critical constraint on the power budget for the chip-scale photonic systems. Hence the direct fiber-chip connection is vastly inefficient with position-restricted accessibility, the key challenge for light coupling involves several factors. This includes geometrical and material discrepancies, different mode field diameters of SMF-28 fibers and photonic waveguides, on-chip design flexibility, and fast optical testing, preferably utilizing available die-level or wafer-scale accessories. In this work, we report on our recent progress in the development of efficient fiber-to-chip optical interfaces based on compact surface grating couplers. We present and discuss prospective design approaches and experimental results for grating-coupled devices implemented on surging silicon (Si) and silicon nitride (SiN) waveguide platforms, supporting advanced photonic integration with coupling efficiencies approaching -1 dB level.

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Contributors

Author: Thalia Dominguez Bucio

Author: Frederic Gardes

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