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arXiv · 2609.08552

Universal Broadband Linear Optical Transformations by an Interlaced Structured Integrated Photonic Processor

Ilya V. Kondratyev·Kseniia N. Urusova·Artem S. Argenchiev·Sergei A. Zhuravitskii·Nikolay N. Skryabin·Alexander D. Golikov·Vadim V. Kovalyuk·Gregory N. Goltsman·Ivan V. Dyakonov·Stanislav S. Straupe·Sergei P. Kulik
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Abstract

Reconfigurable photonic integrated circuits enable applications in a wide range of fields. They represent a powerful platform for signal processing due to the ability to perform parallel computations. In this work, we demonstrate a photonic processor based on a six-channel universal chip fabricated by femtosecond laser writing with an interlaced architecture comprising multiport beam splitters. We exploit and enhance a previously demonstrated calibration procedure for a single building block, and extend it to a complete six-channel interferometer, reconstructing the corresponding interferometer models over a broad spectral range. We validate them by measuring a set of 100 Haar-random unitary matrices, achieving mean amplitude fidelities of 95.9 %, 98.0 %, and 96.0 % for radiation wavelengths 910, 945, and 980 nm, respectively, without on-device optimization. Furthermore, we experimentally realize spectral demultiplexing and multiplexing at these wavelengths, yielding routing fidelities ranging from 90.1 % to 96.5 % and total crosstalk values ranging from -9.6 to -14.4 dB, confirming the applicability of the fabricated photonic processor to practical wavelength-routing tasks.

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Ilya V. Kondratyev, Kseniia N. Urusova, Artem S. Argenchiev, Sergei A. Zhuravitskii, Nikolay N. Skryabin, Alexander D. Golikov, Vadim V. Kovalyuk, Gregory N. Goltsman, Ivan V. Dyakonov, Stanislav S. Straupe, Sergei P. Kulik. 2026-09-08. Universal Broadband Linear Optical Transformations by an Interlaced Structured Integrated Photonic Processor. https://arxiv.org/abs/2609.08552

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