Rajesh Uppal

Rajesh Uppal

  • Joined: January 29, 2016
  • Articles: 3615

Photonic Integrated Circuits: Transformative Technologies and Applications for the Photonics Era

pic

Photonic Integrated Circuits (PICs) are transforming how we process, transmit, and interact with information by utilizing light instead of electrons. These advanced chips leverage photons to deliver ultra-fast data transmission, superior energy efficiency, and higher bandwidth than traditional electronic circuits.…...

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VLEO Beyond the Heat Shield: DARPA’s Quest for Spacecraft Skins That Defy Orbital Drag and Atomic Decay

vleo

The Inescapable Challenge of VLEO As the space domain becomes increasingly congested, contested, and competitive, the United States is turning its eyes to Very Low Earth Orbit (VLEO)—typically between 180 km and 450 km altitude—as the next frontier for tactical…...

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Beyond Silicon: Why Aluminum Nitride Could Revolutionize Power Electronics and UV Lasers

alnit

  The Promise Unlocked For decades, silicon has served as the cornerstone of semiconductor technology, but its performance falters under extreme thermal and electrical conditions. Enter aluminum nitride (AlN)—an ultrawide-bandgap (UWBG) material with a remarkable bandgap of 6.1 eV, placing…...

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Revolutionizing Hull Design: Engineering Ships for the Wind Propulsion Era

hull

Introduction: Hull Optimization at the Heart of Wind-Powered Shipping As the global shipping industry works to balance its pivotal role in trade with mounting environmental responsibilities, reducing greenhouse gas emissions has become an urgent priority. With maritime transport contributing nearly…...

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Orbital Armor: How Militaries Are Securing Satellite Communications Against Electronic Warfare and Cyber Threats

satcom

The Contested Space Domain In modern military operations, information dominance is paramount. Satellite communication systems play a critical role in maintaining beyond-line-of-sight (BLOS) connectivity, allowing widely distributed or forward-deployed units—such as special operations teams in remote theaters—to maintain constant contact…...

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The Multimode Sensor Revolution: One Aperture to Rule All Domains

multimode sensor

The End of Federated Systems For decades, military aircraft, ships, and land systems have been overloaded with a patchwork of dedicated sensors and antenna arrays. Each mission-specific system—radar dishes for targeting, electronic warfare (EW) arrays for jamming, SATCOM domes for…...

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2025’s Space Connectivity Breakthrough: Hybrid Optical and Microwave ISLs Powering the New Orbital Internet

DARPAISL

Introduction: The Rise of Intersatellite Connectivity in the Space Age In today’s rapidly advancing space and communication landscape, Intersatellite Links (ISLs) are emerging as a cornerstone of modern satellite constellations. These links—whether microwave or laser-based—enable satellites to communicate directly with…...

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DARPA’s PWND² Program: Building Provably Secure Hidden Networks for the Digital Battlefield

pwnd

The Challenge: Securing Communications in the Age of Persistent Surveillance Modern military operations depend on communication networks that are not only secure but also invisible to adversaries. Traditional approaches to hidden networking—ranging from VPNs to Tor and custom-encrypted channels—have provided…...

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Quantum Light on a Chip: How Silicon Carbide Is Unifying Photonic Technology

quantum light

In the race toward practical quantum technologies, silicon carbide (SiC) has emerged as a transformative force—quietly transcending its roots in power electronics to become the most promising material for integrated quantum photonics. With its rare combination of quantum emitters, nonlinear…...

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Exploring the Cosmos: Space Propulsion Technologies, and Trends Driving a Cosmic Revolution

spacepropulsion

The vastness of space has long stirred human curiosity and ambition, driving us to explore beyond the bounds of Earth. As our aspirations shift toward deeper and more sustained space exploration—whether it’s deploying advanced satellites, sending robotic missions to distant…...

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