# PicoJool raises $27.5M Series A to scale optical VCSEL links for AI data centers

Digest AI · Hardware & Compute · published 2026-09-24T13:12:00Z

Canonical: https://digestai.news/story/picojool-raises-27-5m-series-a-to-scale-optical-vcsel-links-for-ai-dat

## Summary

PicoJool, a Palo Alto-based startup, secured **$27.5 million** in Series A funding to commercialize optical connectivity solutions for AI data centers. Socratic Partners led the round, with participation from Hudson River Trading, following a **$12 million** seed round led by Playground Global. The total funding now stands at **$39.5 million**, which the company will use to expand teams and facilities in the US and Taiwan, qualify products for hyperscalers, and build manufacturing capacity.

The funding comes as AI infrastructure faces a critical bottleneck: data transfer between processors in dense clusters. PicoJool’s technology—vertical-cavity surface-emitting lasers (VCSELs)—aims to reduce latency and energy use in high-speed links like its **200G-per-lane VCSEL**, which the company claims exceeds **37 GHz** of bandwidth. The startup is also developing lower-power MicroVCSEL configurations for near-packaged and co-packaged optics. Unlike competitors, PicoJool treats optical links as core to system efficiency, arguing that energy-per-bit reductions directly impact power density and cooling needs.

The Series A follows PicoJool’s June unveiling of its VCSEL and MicroVCSEL family. The company is collaborating with **WIN Semiconductor**, a gallium-arsenide foundry, to prepare for production. Success hinges on overcoming yield, reliability, and integration challenges—key hurdles for optical components scaling to hyperscale volumes.

## Key points

- PicoJool raised **$27.5M** Series A, led by Socratic Partners, with Hudson River Trading participating
- Company targets **200G-per-lane VCSELs** exceeding **37 GHz** bandwidth for AI data center links
- Funds will expand US/Taiwan operations, qualify products for hyperscalers, and partner with WIN Semiconductor

## Why it matters

AI data centers need faster, lower-power data links to match growing processor clusters. PicoJool’s VCSEL tech could reduce bottlenecks in hyperscale deployments if it scales reliably, but competition from silicon photonics and networking vendors remains fierce.

## Sources

1. [PicoJool Raises $27.5M to Scale Optical Connectivity for AI Data Centers](https://unite.ai/picojool-raises-27-5m-to-scale-optical-connectivity-for-ai-data-centers) (Unite.AI, 2026-09-24)
2. [PicoJool Raises $27.5M Series A to Scale Optical Connectivity for AI Data Centers](https://unite.ai/picojool-raises-27-5m-series-a-to-scale-optical-connectivity-for-ai-data-centers) (Unite.AI, 2026-09-24)

## Cite

Digest AI, "PicoJool raises $27.5M Series A to scale optical VCSEL links for AI data centers", 24 September 2026, https://digestai.news/story/picojool-raises-27-5m-series-a-to-scale-optical-vcsel-links-for-ai-dat

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