Calient

Calient has raised $458 million across multiple rounds, including a $6M Series F round in August 2016, a $13.2M Series F round in March 2017, and a $32M Series G round in August 2019. Founded in 1999, the company specializes in photonic optical circuit switching solutions designed for high-capacity, low-latency network environments. Calient’s funding rounds supported the refinement of its Optical Circuit Switch (OCS) technology, expansion into telecom and hyperscale data centers, and development of automation tools that optimize high-bandwidth, software-defined networks before its acquisition.