Celestial AI has raised an additional$250 million in venture capital, bringing its total funding to$515 million. The Silicon Valley startup is developing photonics-based technology to improve the speed and efficiency of AI computing.

By using light instead of electrical signals to connect AI chips with memory, the company aims to address the growing demand for higher memory bandwidth, a crucial factor in AI development.

Nvidia currently dominates this space with its NVLink and NVSwitch technologies, prompting a race among startups to develop alternative solutions.

Celestial AI's 'photonic fabric' technology is designed to act as a high-speed bridge between chips, offering improved energy efficiency and lower latency. Backed by AMD's venture arm, the company is positioning itself as a viable alternative to Nvidia's proprietary systems.

The latest funding round was led by Fidelity Management & Research and included major investors such as BlackRock, Maverick Capital, and Tiger Global. Other participants included Temasek, Porsche Automobil Holding, and The Engine Ventures.

As AI hardware innovation accelerates, Celestial AI is among a growing group of startups seeking to reshape the industry with new approaches to chip design.