Research Bits: May 21


Lithium tantalate PICs Researchers at EPFL and Shanghai Institute of Microsystem and Information Technology developed scalable photonic integrated circuits (PICs) based on lithium tantalate (LiTaO3). Lithium tantalate can provide excellent electro-optic qualities and is used in telecom 5G RF filters. The team developed a wafer-bonding method for lithium tantalate, which is compatible with s... » read more

Thermal Crosstalk Modelling And Compensation Methods for Programmable Photonic ICs (TU Denmark, iPronics)


A technical paper titled “Thermal Crosstalk Modelling and Compensation Methods for Programmable Photonic Integrated Circuits” was published by researchers at the Technical University of Denmark and iPronics Programmable Photonics. Abstract: "Photonic integrated circuits play an important role in the field of optical computing, promising faster and more energy-efficient operations compared... » read more

Design Considerations In Photonics


Experts at the Table: Semiconductor Engineering sat down to talk about what CMOS and photonics engineers need to know to successfully collaborate, with James Pond, fellow at Ansys; Gilles Lamant, distinguished engineer at Cadence; and Mitch Heins, business development manager for photonic solutions at Synopsys. What follows are excerpts of that conversation. To view part one of this discussion,... » read more

Research Bits: April 30


Sound waves in optical neural networks Researchers from the Max Planck Institute for the Science of Light and Massachusetts Institute of Technology found a way to build reconfigurable recurrent operators based on sound waves for photonic machine learning. They used light to create temporary acoustic waves in an optical fiber, which manipulate subsequent computational steps of an optical rec... » read more

Research Bits: April 23


Probabilistic computer prototype Researchers at Tohoku University and the University of California Santa Barbara created a prototype of a heterogeneous probabilistic computer that combines a CMOS circuit with a limited number of stochastic nanomagnets. It aims to improve the execution of probabilistic algorithms used to solve problems where uncertainty is inherent or where an exact solution... » read more

RF General-Purpose Photonic Processor


A new technical paper titled "General-purpose programmable photonic processor for advanced radiofrequency applications" was published by researchers at Universitat Politècnica de València and iPronics. Abstract "A general-purpose photonic processor can be built integrating a silicon photonic programmable core in a technology stack comprising an electronic monitoring and controlling layer ... » read more

Linear Drive Optics May Reduce Data Latency


Optical and electrical are starting to cross paths at a much deeper level, particularly with the growing focus on 3D-ICs and AI/ML training in data centers, driving changes both in how chips are designed and how these very different technologies are integrated together. At the root of this shift are the power and performance demands of AI/ML. It can now take several buildings of a data cente... » read more

Fabrication Of Vertical-Taper Structures For Silicon Photonic Devices By Using Local-Thickness-Thinning Process


Authors: Shunsuke Abe, Hideo Hara, Shin Masuda, and Hirohito Yamada. This paper describes a simple fabrication process of verticaltaper structures which can locally tune the thickness of silicon photonic devices. For low-loss spot-size conversion, taper angles less than 10° are required. To fabricate the gradual-slope shape of the vertical tapers, we have developed a step-andexposure lithog... » read more

Chip Industry Week In Review


By Adam Kovac, Karen Heyman, and Liz Allan.  China introduced strict procurement guidelines aimed at blocking the use of AMD and Intel processors in government computers. Meanwhile, China urged the Netherlands to ease restrictions on deep ultraviolet (DUV) litho equipment, according to Nikkei Asia. DUV is an older technology, based on 193nm ArF lasers, but in conjunction with multi-p... » read more

Photonic Compact Chip That Seamlessly Converts Light Into Microwaves (NIST, et al.)


A new technical paper titled "Photonic chip-based low-noise microwave oscillator" was published by researchers at NIST, University of Colorado Boulder, California Institute of Technology, UCSB, University of Virginia and Yale University. Abstract "Numerous modern technologies are reliant on the low-phase noise and exquisite timing stability of microwave signals. Substantial progress has b... » read more

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