Phys.org June 20, 2024 On-chip frequency combs have relied predominantly on single-ring resonators. A team of researchers in the US (University of Maryland, University of Illinois, Northeastern University) experimentally demonstrated the generation of topological frequency combs, in a two-dimensional lattice of hundreds of ring resonators that hosts fabrication-robust topological edge states with linear dispersion. By pumping these edge states, they demonstrated the generation of a nested frequency comb that showed oscillation of multiple edge state resonances across ≈40 longitudinal modes and was spatially confined at the lattice edge. According to the researchers their results provide an opportunity to explore the […]
Tag Archives: photonic chip
Researchers turn a small photonic chip into a functional temperature sensor
Phys.org December 15, 2023 An international team of researchers (Belgium, Greece, Czech Republic) showed described in detail the process to obtain a fully packaged miniature photonic temperature sensor starting from bare PIC dies having Bragg grating sensors in a silicon waveguide. The PIC was interfaced from the back side using a 300 μm ball lens ensuring that the top surface remained clear of any interfacing fibers. Based on this they developed a solution for integrating a 1 mm × 1 mm sensor PIC with a single-mode fiber and packaging it in a 1.5 mm inner-diameter metal protective tube. A packaged […]
Photonic chip with record-breaking radio frequency dynamic range
Phys.org December 22, 2022 An international team of researchers (the Netherlands, China, Switzerland) has developed a multi-functional photonic integrated circuit that enables programmable filtering functions with record-high performance using versatile complex spectrum tailoring enabled by an all-integrated modulation transformer and a double injection ring resonator as a multi-function optical filtering component. They demonstrated reconfigurable filter functions with record-low noise figure and a RF notch filter with ultra-high dynamic range. According to the researchers their work breaks the conventional and fragmented approach of integration, functionality and performance that currently prevents the adoption of integrated microwave photonic systems in real applications…read more. […]
Engineers create chip that can process and classify nearly two billion images per second
Nanowerk June 4, 2022 In the optical domain, despite advances in photonic computation, the lack of scalable on-chip optical non-linearity and the loss of photonic devices limit the scalability of optical deep networks. Researchers at the University of Pennsylvania created an integrated end-to-end photonic deep neural network (PDNN) that performs sub-nanosecond image classification through direct processing of the optical waves impinging on the on-chip pixel array as they propagate through layers of neurons. In each neuron, linear computation was performed optically, and the non-linear activation function was realized opto-electronically, allowing a classification time of under 570 ps, which is comparable with […]
New hole-punched crystal clears a path for quantum light
Science Daily February 15, 2018 Researchers at the University of Maryland created a photonic chip that both generates single photons and steers them around. In the new chip, they etched out thousands of triangular holes in an array that resembled a bee’s honeycomb. Along the center of the device they shifted the spacing of the holes, which opens a different kind of travel lane for the light. The team tested the capabilities of the chip by first changing a quantum emitter from its lowest energy state to one of its two higher energy states. When they used photons from the […]