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Quantum well interband semiconductor lasers highly tolerant to dislocations


Abstract "III-V semiconductor lasers integrated on Si-based photonic platforms are eagerly awaited by the industry for mass-scale applications, from interconnect to on-chip sensing. The current understanding is that only quantum dot lasers can reasonably operate at the high dislocation densities generated by the III-V-on-Si heteroepitaxy, which induces high non-radiative carrier recombination ... » read more

Will Co-Packaged Optics Replace Pluggables?


As optical connections work their way deeper into the data center, a debate is underway. Is it better to use pluggable optical modules or to embed lasers deep into advanced packages? There are issues of convenience, power, and reliability driving the discussion, and an eventual winner isn’t clear yet. “The industry is definitely embracing co-packaged optics,” said James Pond, principal... » read more

Automotive Lidar Technologies Battle It Out


Lidar is likely to be added to the list of sensors that future cars will use to help with navigation and safety, but most likely it won't be the large rotating mirror assembly on the top of vehicles. Newer solid-state radar technologies are being researched and developed, although it’s not yet clear which of these will win. “The benefits of lidar technology are well known dating back to ... » read more

Chipmakers Getting Serious About Integrated Photonics


Integrating photonics into semiconductors is gaining traction, particularly in heterogeneous multi-die packages, as chipmakers search for new ways to overcome power limitations and deal with increasing volumes of data. Power has been a growing concern since the end of Dennard scaling, which happened somewhere around the 90nm node. There are more transistors per mm², and the wires are thinne... » read more

Power/Performance Bits: Sept. 1


Cooling sensors with lasers Researchers at the University of Washington developed a way to cool a solid semiconductor sensor component with an infrared laser. The laser was able to cool the solid semiconductor by at least 20 degrees C, or 36 F, below room temperature. The device uses a cantilever, similar to a diving board, that can oscillate in response to thermal energy at room temperatur... » read more

Simulation Of Semiconductor Edge-Emitting Lasers


By Peter Hallschmid and Dylan McGuire The demand for photonics technology continues to grow with popular laser applications including semiconductor optical amplifiers (SOAs), Fabry-Perot (FP) devices and distributed feedback (DFB) lasers. The next episode of Ansys’ photonics webinar series outlines the latest Ansys Lumerical flows and products for simulating and generating compact mod... » read more

Power/Performance Bits: June 30


Up-converting lasers Researchers at the University of Pennsylvania developed a filter chip that can convert the output from low-cost lasers to have the same frequency noise as big, expensive lasers, making them suitable for applications such as LiDAR. The noise in a laser's frequency is an important indicator of quality. Low-quality, noisy lasers have more random variations, making them use... » read more

System Bits: July 30


A camera that sees around corners Researchers at Stanford University developed a camera system that can detect moving objects around a corner, looking at single particles of light reflected on a wall. “People talk about building a camera that can see as well as humans for applications such as autonomous cars and robots, but we want to build systems that go well beyond that,” said Gordon... » read more

System Bits: April 30


Future batteries could use a graphene sponge Researchers at Sweden’s Chalmers University of Technology devised a porous, sponge-like aerogel, made of reduced-graphene oxide, to serve as a freestanding electrode in the battery cell. This utilization has the potential to advance lithium sulfur batteries, which are said to possess a theoretical energy density about five times greater than lithi... » read more

Manufacturing Bits: Nov. 7


Making a superbeam Lawrence Livermore National Laboratory (LLNL) has combined several lasers to create what it calls a superbeam. The move represents a possible breakthrough in the arena. In theory, lasers can be combined. But the laser beams tend to pass through each other, thereby making a combined laser or a superbeam nearly impossible. With the help of plasma optics, however, LLNL ha... » read more

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