Universal Broadband Linear Optical Transformations by an Interlaced Structured Integrated Photonic Processor
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.
Related
- Broadband Visible-Spectrum Single-Mode Integrated Photonics on a Silicon Nitride Platform
- Reconfigurable Linear Optical Transformations in a Single Integrated Multimode Waveguide
- Bi-Oriented Interlaced Matrix Multiplication and an Operator Factorisation of the Quantum Harmonic Oscillator
- Integrated robust universal linear optics based on white-boxed multi-plane light conversion
- Quantum eigenvalue transformations for arbitrary matrices
BibTeX
@misc{kondratyev2026universal,
title = {{Universal Broadband Linear Optical Transformations by an Interlaced Structured Integrated Photonic Processor}},
author = {Ilya V. Kondratyev and Kseniia N. Urusova and Artem S. Argenchiev and Sergei A. Zhuravitskii and Nikolay N. Skryabin and Alexander D. Golikov and Vadim V. Kovalyuk and Gregory N. Goltsman and Ivan V. Dyakonov and Stanislav S. Straupe and Sergei P. Kulik},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.08552},
eprint = {2609.08552},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.08552},
}
RIS
TY - UNPB
TI - Universal Broadband Linear Optical Transformations by an Interlaced Structured Integrated Photonic Processor
AU - Ilya V. Kondratyev
AU - Kseniia N. Urusova
AU - Artem S. Argenchiev
AU - Sergei A. Zhuravitskii
AU - Nikolay N. Skryabin
AU - Alexander D. Golikov
AU - Vadim V. Kovalyuk
AU - Gregory N. Goltsman
AU - Ivan V. Dyakonov
AU - Stanislav S. Straupe
AU - Sergei P. Kulik
PY - 2026
DA - 2026/09/08
PB - arXiv
DO - 10.48550/arxiv.2609.08552
UR - https://arxiv.org/abs/2609.08552
AB - 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.
ER -