The Experts below are selected from a list of 8628 Experts worldwide ranked by ideXlab platform
Raffaele Colombelli - One of the best experts on this subject based on the ideXlab platform.
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Millimeter wave photonics with terahertz semiconductor lasers
Nature Communications, 2021Co-Authors: Valentino Pistore, Hanond Nong, Pierre-baptiste Vigneron, Katia Garrasi, Sarah Houver, A. Giles Davies, Edmund Linfield, Jerome Tignon, Juliette Mangeney, Raffaele ColombelliAbstract:Millimeter wave (mmWave) generation using photonic techniques has so far been limited to the use of near-infrared lasers that are down-converted to the mmWave region. However, such methodologies do not currently benefit from a Monolithic Architecture and suffer from the quantum defect i.e. the difference in photon energies between the near-infrared and mmWave region, which can ultimately limit the conversion efficiency. Miniaturized terahertz (THz) quantum cascade lasers (QCLs) have inherent advantages in this respect: their low energy photons, ultrafast gain relaxation and high nonlinearities open up the possibility of innovatively integrating both laser action and mmWave generation in a single device. Here, we demonstrate intracavity mmWave generation within THz QCLs over the unprecedented range of 25 GHz to 500 GHz. Through ultrafast time resolved techniques, we highlight the importance of modal phases and that the process is a result of a giant second-order nonlinearity combined with a phase matched process between the THz and mmWave emission. Importantly, this work opens up the possibility of compact, low noise mmWave generation using modelocked THz frequency combs.
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Millimeter wave photonics with terahertz semiconductor lasers
Nature Communications, 2021Co-Authors: Valentino Pistore, Hanond Nong, Pierre-baptiste Vigneron, Katia Garrasi, Sarah Houver, A. Giles Davies, Edmund Linfield, Jerome Tignon, Juliette Mangeney, Raffaele ColombelliAbstract:Millimeter wave (mmWave) generation using photonic techniques has so far been limited to the use of near-infrared lasers that are down-converted to the mmWave region. However, such methodologies do not currently benefit from a Monolithic Architecture and suffer from the quantum defect i.e. the difference in photon energies between the near-infrared and mmWave region, which can ultimately limit the conversion efficiency. Miniaturized terahertz (THz) quantum cascade lasers (QCLs) have inherent advantages in this respect: their low energy photons, ultrafast gain relaxation and high nonlinearities open up the possibility of innovatively integrating both laser action and mmWave generation in a single device. Here, we demonstrate intracavity mmWave generation within THz QCLs over the unprecedented range of 25 GHz to 500 GHz. Through ultrafast time resolved techniques, we highlight the importance of modal phases and that the process is a result of a giant second-order nonlinearity combined with a phase matched process between the THz and mmWave emission. Importantly, this work opens up the possibility of compact, low noise mmWave generation using modelocked THz frequency combs. Photonic solutions for generating free space millimeter radiation is a fast developing field that combines optoelectronics and RF domains but has many challenges. Here the authors present a quantum cascade laser (QCL) based solution for THz laser emission and millimeter wave generation in a single device.
Angee Zambrano - One of the best experts on this subject based on the ideXlab platform.
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Cost comparison of running web applications in the cloud using Monolithic, microservice, and AWS Lambda Architectures
Service Oriented Computing and Applications, 2017Co-Authors: Mario Villamizar, Oscar Garces, Mauricio Verano, Lorena Salamanca, Angee Zambrano, Rubby Casallas, Lina Ochoa, Harold Castro, Carlos Valencia, Mery LangAbstract:Large Internet companies like Amazon, Netflix, and LinkedIn are using the microservice Architecture pattern to deploy large applications in the cloud as a set of small services that can be independently developed, tested, deployed, scaled, operated, and upgraded. However, aside from gaining agility, independent development, and scalability, how microservices affect the infrastructure costs is a major evaluation topic for companies adopting this pattern. This paper presents a cost comparison of a web application developed and deployed using the same scalable scenarios with three different approaches: 1) a Monolithic Architecture, 2) a microservice Architecture operated by the cloud customer, and 3) a microservice Architecture operated by the cloud provider. Test results show that microservices can help reduce infrastructure costs in comparison with standard Monolithic Architectures. Moreover, the use of services specifically designed to deploy and scale microservices, such as AWS Lambda, reduces infrastructure costs by 70% or more, and unlike microservices operated by cloud customers, these specialized services help to guarantee the same performance and response times as the number of users increases. Lastly, we also describe the challenges we faced while implementing and deploying microservice applications, and include a discussion on how to replicate the results on other cloud providers.
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CCGrid - Infrastructure Cost Comparison of Running Web Applications in the Cloud Using AWS Lambda and Monolithic and Microservice Architectures
2016 16th IEEE ACM International Symposium on Cluster Cloud and Grid Computing (CCGrid), 2016Co-Authors: Mario Villamizar, Oscar Garces, Mauricio Verano, Lorena Salamanca, Rubby Casallas, Santiago Gil, Lina Ochoa, Harold Castro, Carlos Valencia, Angee ZambranoAbstract:Large Internet companies like Amazon, Netflix, and LinkedIn are using the microservice Architecture pattern to deploy large applications in the cloud as a set of small services that can be developed, tested, deployed, scaled, operated and upgraded independently. However, aside from gaining agility, independent development, and scalability, infrastructure costs are a major concern for companies adopting this pattern. This paper presents a cost comparison of a web application developed and deployed using the same scalable scenarios with three different approaches: 1) a Monolithic Architecture, 2) a microservice Architecture operated by the cloud customer, and 3) a microservice Architecture operated by the cloud provider. Test results show that microservices can help reduce infrastructure costs in comparison to standard Monolithic Architectures. Moreover, the use of services specifically designed to deploy and scale microservices reduces infrastructure costs by 70% or more. Lastly, we also describe the challenges we faced while implementing and deploying microservice applications.
Mario Villamizar - One of the best experts on this subject based on the ideXlab platform.
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Cost comparison of running web applications in the cloud using Monolithic, microservice, and AWS Lambda Architectures
Service Oriented Computing and Applications, 2017Co-Authors: Mario Villamizar, Oscar Garces, Mauricio Verano, Lorena Salamanca, Angee Zambrano, Rubby Casallas, Lina Ochoa, Harold Castro, Carlos Valencia, Mery LangAbstract:Large Internet companies like Amazon, Netflix, and LinkedIn are using the microservice Architecture pattern to deploy large applications in the cloud as a set of small services that can be independently developed, tested, deployed, scaled, operated, and upgraded. However, aside from gaining agility, independent development, and scalability, how microservices affect the infrastructure costs is a major evaluation topic for companies adopting this pattern. This paper presents a cost comparison of a web application developed and deployed using the same scalable scenarios with three different approaches: 1) a Monolithic Architecture, 2) a microservice Architecture operated by the cloud customer, and 3) a microservice Architecture operated by the cloud provider. Test results show that microservices can help reduce infrastructure costs in comparison with standard Monolithic Architectures. Moreover, the use of services specifically designed to deploy and scale microservices, such as AWS Lambda, reduces infrastructure costs by 70% or more, and unlike microservices operated by cloud customers, these specialized services help to guarantee the same performance and response times as the number of users increases. Lastly, we also describe the challenges we faced while implementing and deploying microservice applications, and include a discussion on how to replicate the results on other cloud providers.
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CCGrid - Infrastructure Cost Comparison of Running Web Applications in the Cloud Using AWS Lambda and Monolithic and Microservice Architectures
2016 16th IEEE ACM International Symposium on Cluster Cloud and Grid Computing (CCGrid), 2016Co-Authors: Mario Villamizar, Oscar Garces, Mauricio Verano, Lorena Salamanca, Rubby Casallas, Santiago Gil, Lina Ochoa, Harold Castro, Carlos Valencia, Angee ZambranoAbstract:Large Internet companies like Amazon, Netflix, and LinkedIn are using the microservice Architecture pattern to deploy large applications in the cloud as a set of small services that can be developed, tested, deployed, scaled, operated and upgraded independently. However, aside from gaining agility, independent development, and scalability, infrastructure costs are a major concern for companies adopting this pattern. This paper presents a cost comparison of a web application developed and deployed using the same scalable scenarios with three different approaches: 1) a Monolithic Architecture, 2) a microservice Architecture operated by the cloud customer, and 3) a microservice Architecture operated by the cloud provider. Test results show that microservices can help reduce infrastructure costs in comparison to standard Monolithic Architectures. Moreover, the use of services specifically designed to deploy and scale microservices reduces infrastructure costs by 70% or more. Lastly, we also describe the challenges we faced while implementing and deploying microservice applications.
Mery Lang - One of the best experts on this subject based on the ideXlab platform.
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Cost comparison of running web applications in the cloud using Monolithic, microservice, and AWS Lambda Architectures
Service Oriented Computing and Applications, 2017Co-Authors: Mario Villamizar, Oscar Garces, Mauricio Verano, Lorena Salamanca, Angee Zambrano, Rubby Casallas, Lina Ochoa, Harold Castro, Carlos Valencia, Mery LangAbstract:Large Internet companies like Amazon, Netflix, and LinkedIn are using the microservice Architecture pattern to deploy large applications in the cloud as a set of small services that can be independently developed, tested, deployed, scaled, operated, and upgraded. However, aside from gaining agility, independent development, and scalability, how microservices affect the infrastructure costs is a major evaluation topic for companies adopting this pattern. This paper presents a cost comparison of a web application developed and deployed using the same scalable scenarios with three different approaches: 1) a Monolithic Architecture, 2) a microservice Architecture operated by the cloud customer, and 3) a microservice Architecture operated by the cloud provider. Test results show that microservices can help reduce infrastructure costs in comparison with standard Monolithic Architectures. Moreover, the use of services specifically designed to deploy and scale microservices, such as AWS Lambda, reduces infrastructure costs by 70% or more, and unlike microservices operated by cloud customers, these specialized services help to guarantee the same performance and response times as the number of users increases. Lastly, we also describe the challenges we faced while implementing and deploying microservice applications, and include a discussion on how to replicate the results on other cloud providers.
Valentino Pistore - One of the best experts on this subject based on the ideXlab platform.
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Millimeter wave photonics with terahertz semiconductor lasers
Nature Communications, 2021Co-Authors: Valentino Pistore, Hanond Nong, Pierre-baptiste Vigneron, Katia Garrasi, Sarah Houver, A. Giles Davies, Edmund Linfield, Jerome Tignon, Juliette Mangeney, Raffaele ColombelliAbstract:Millimeter wave (mmWave) generation using photonic techniques has so far been limited to the use of near-infrared lasers that are down-converted to the mmWave region. However, such methodologies do not currently benefit from a Monolithic Architecture and suffer from the quantum defect i.e. the difference in photon energies between the near-infrared and mmWave region, which can ultimately limit the conversion efficiency. Miniaturized terahertz (THz) quantum cascade lasers (QCLs) have inherent advantages in this respect: their low energy photons, ultrafast gain relaxation and high nonlinearities open up the possibility of innovatively integrating both laser action and mmWave generation in a single device. Here, we demonstrate intracavity mmWave generation within THz QCLs over the unprecedented range of 25 GHz to 500 GHz. Through ultrafast time resolved techniques, we highlight the importance of modal phases and that the process is a result of a giant second-order nonlinearity combined with a phase matched process between the THz and mmWave emission. Importantly, this work opens up the possibility of compact, low noise mmWave generation using modelocked THz frequency combs.
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Millimeter wave photonics with terahertz semiconductor lasers
Nature Communications, 2021Co-Authors: Valentino Pistore, Hanond Nong, Pierre-baptiste Vigneron, Katia Garrasi, Sarah Houver, A. Giles Davies, Edmund Linfield, Jerome Tignon, Juliette Mangeney, Raffaele ColombelliAbstract:Millimeter wave (mmWave) generation using photonic techniques has so far been limited to the use of near-infrared lasers that are down-converted to the mmWave region. However, such methodologies do not currently benefit from a Monolithic Architecture and suffer from the quantum defect i.e. the difference in photon energies between the near-infrared and mmWave region, which can ultimately limit the conversion efficiency. Miniaturized terahertz (THz) quantum cascade lasers (QCLs) have inherent advantages in this respect: their low energy photons, ultrafast gain relaxation and high nonlinearities open up the possibility of innovatively integrating both laser action and mmWave generation in a single device. Here, we demonstrate intracavity mmWave generation within THz QCLs over the unprecedented range of 25 GHz to 500 GHz. Through ultrafast time resolved techniques, we highlight the importance of modal phases and that the process is a result of a giant second-order nonlinearity combined with a phase matched process between the THz and mmWave emission. Importantly, this work opens up the possibility of compact, low noise mmWave generation using modelocked THz frequency combs. Photonic solutions for generating free space millimeter radiation is a fast developing field that combines optoelectronics and RF domains but has many challenges. Here the authors present a quantum cascade laser (QCL) based solution for THz laser emission and millimeter wave generation in a single device.
