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Programmable photonics chips based on a versatile structure are crucial for the next generation of advanced photonics systems. In this paper, we designed a programmable photonics chip with a hexagonal waveguide mesh consisting of longitudinally parallel arranged tunable basic units based on thin-film lithium niobate. We fabricated a waveguide mesh on a chip with an effective area of 5.2 ×1.5 , which contains six tunable basic units, and tested its performance. The extinction ratio of both output ports of the tunable basic units exceeded 15 dB, with =46 and a response time of about 32 µs. By programming the waveguide mesh through a PC, it can be configured as a multi-channel adjustable optical switch, where the extinction ratio of each output port is greater than 15 dB. This can be applied to all-optical networks for arbitrary path switching.
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http://dx.doi.org/10.1364/AO.547149 | DOI Listing |
Programmable photonics chips based on a versatile structure are crucial for the next generation of advanced photonics systems. In this paper, we designed a programmable photonics chip with a hexagonal waveguide mesh consisting of longitudinally parallel arranged tunable basic units based on thin-film lithium niobate. We fabricated a waveguide mesh on a chip with an effective area of 5.
View Article and Find Full Text PDFIn this work, we experimentally validate the dual use of a reconfigurable photonic integrated mesh as a neuromorphic accelerator, targeting signal equalization, and as a physical unclonable function offering authentication at the hardware level. The processing node is an optical spectrum slicing self-coherent transceiver targeting the mitigation of dispersion impairments of an intensity-detected QPSK signal, after 25 km of transmission at 32 Gbaud. Unavoidable fabrication-related imperfections of the nodes, such as waveguide roughness, can act as "fingerprints" of the device, and, during neuromorphic processing, result in unique weights at the digital back-end during signal equalization.
View Article and Find Full Text PDFIn this paper, we numerically investigate the plasmonic properties of three-dimensional metallic wire-based terahertz (THz) metamaterials, with the aim of elucidating the plasmonic mode coupling within these structures. Two structures are examined: a metallic bent wire array and a woven wire mesh composed of two interwoven metallic wire arrays. Despite being composed of simple metallic wires, both systems exhibit intricate plasmonic behavior arising from the coupling of THz surface plasmon polariton (SPP) modes on the individual wires.
View Article and Find Full Text PDFSci Adv
April 2025
State Key Laboratory of Extreme Photonics and Instrumentation, Zhejiang Key Laboratory of Optoelectronic Information Technology, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310058, China.
Matrix-vector multiplication is a fundamental operation in modern signal processing and artificial intelligence. Developing a chip-scale photonic matrix-vector multiplication processor (MVMP) offers the potential for notably enhanced computing speed and energy efficiency beyond microelectronics. Here, we propose and demonstrate a 16-channel programmable on-chip coherent photonic processor capable of performing complex-valued matrix-vector multiplication at a computing speed of 1.
View Article and Find Full Text PDFACS Photonics
March 2025
School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, United Kingdom.
The development of low-loss reconfigurable integrated optical devices enables further research into technologies including photonic signal processing, analogue quantum computing, and optical neural networks. Here, we introduce digital patterning of coupled waveguide arrays as a platform capable of implementing unitary matrix operations. Determining the required device geometry for a specific optical output is computationally challenging and requires a robust and versatile inverse design protocol.
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