Walden Catalyst Leads $50M Series B for Polaris Electro-Optics
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Polaris Electro-Optics has announced $50 million in new financing to bring its FenGlass electro-optic modulator platform to production. Walden Catalyst Ventures led the Series B.
New investors Socratic Partners, Cambium Capital, Knollwood, and Hudson River Trading joined, along with existing backers Koch Disruptive Technologies, M Ventures, Rhapsody Venture Partners, Buff Gold Ventures, and Blue Sky Capital. Andy Kau, a partner at Walden Catalyst, is joining the board.
The problem the company is chasing sits in AI infrastructure. As workloads grow in the agentic era, moving data has become the bottleneck: networks are bandwidth constrained, and energy consumption per bit is unsustainable. Hyperscalers, neoclouds, and infrastructure providers are trying to scale both the data rate per lane and the number of lanes, and the next node calls for 400 Gbps per lane and beyond across scale-up, scale-out, scale-across, and data center interconnect.
Other next-generation modulator technologies force a trade-off between manufacturability, reliability, and bandwidth. FenGlass is built to remove it. The platform uses a proprietary ferroelectric nematic glass with a strong Pockels effect, integrated directly onto finished silicon photonic wafers after they leave the foundry, using standard processes and no poling. The result reaches 400 Gbps per lane at sub-volt drive voltages in a compact footprint with good linearity, inside the silicon photonics platform the industry has already qualified.
Polaris has demonstrated and independently verified 400 Gbps per lane modulation with FenGlass, completed Telcordia reliability tests, and validated compatibility with standard solder reflow, all requirements for optical interconnect applications relying on flip-chip, 2.5D, and 3D packaging. Because FenGlass is an engineered material, its electro-optic response can be tuned across product generations, from 200G per lane to 400G and toward 800G.
The company is working with optical module makers, hyperscalers, and major cloud infrastructure providers across pluggable modules, near-packaged optics, co-packaged optics, and coherent scale-across architectures. First product launch is targeted for 2027.
Founded in 2021 as a spinout of the University of Colorado Boulder, Polaris develops its materials in Boulder, Colorado. Its photonic solutions come out of its headquarters in Carlsbad, California. The new money funds portfolio expansion, volume scale-up, product tapeouts, qualification, and engineering hiring at both sites.
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