Lightspring

Designs and fabricates 3D optical interconnects for photonic integrated circuits using Two-Photon Polymerization.

Cover Block

Publicly reported

Field	Value
Name	Lightspring
Tagline	Designs and fabricates 3D optical interconnects for photonic integrated circuits using Two-Photon Polymerization [Lightspring]
Headquarters	Besançon, France [Tech.eu, September 2026]
Founded	2026
Stage	Seed [Tech.eu, September 2026]
Business model	B2B
Industry	Deeptech
Technology type	Hardware
Geography	Western Europe
Growth profile	Venture Scale
Founding team	Co-Founders (3+): Grégoire Bonnat, Adrià Grabulosa, Daniel Brunner [LinkedIn, retrieved 2026]
Funding label	Seed
Total disclosed	Approximately $3,350,000, based on a reported €3.1 million seed round (estimated) [Tech.eu, September 2026]

Summary and Signal

PUBLIC Lightspring builds 3D optical interconnects for photonic integrated circuits, and it merits attention now because it has just secured more than €3.5 million in total financing to move a research-born packaging process toward industrial production [Tech.eu, September 2026]. The company is based in Besançon, France, and its public story is straightforward: instead of redesigning photonic chips themselves, it is targeting the optical input-output and packaging layer, which reported coverage says can represent roughly half of a photonic chip's cost [Tech.eu, September 2026] [FW.media].

The technical wedge is two-photon polymerization, or 2PP, which Lightspring uses to fabricate microlenses, 3D waveguides, and related optical-coupling structures directly on photonic chips in a single fabrication step, according to funding coverage and the company website [Tech.eu, September 2026] [Graft and Grit] [Lightspring]. The differentiation claim rests less on a new photonic architecture than on manufacturing precision at the packaging layer, with the company arguing that fiber-to-chip, chip-to-chip, and beam-shaping interfaces can be written directly onto chip surfaces and adapted across foundry processes [FW.media] [Lightspring].

The founding team appears credible for a first technical diligence pass. Public sources identify Grégoire Bonnat as co-founder and CEO, Adrià Grabulosa as co-founder and CTO, and Daniel Brunner as co-founder and scientific director, with the company described as building on earlier scientific work associated with the FEMTO-ST Institute in Besançon [LinkedIn] [AIPressroom] [Les Echos].

On financing, the reported equity round was €3.1 million, led by Atlantic and OVNI Capital, with participation from Concept Ventures, Ixcore, Plug and Play Ventures, and business angels; Tech.eu also reports a €350,000 i-Lab grant, bringing total financing to more than €3.5 million [Tech.eu, September 2026]. The business model is B2B hardware and manufacturing enablement for industrial photonics and photonic integrated circuit makers, though named customers, production deployments, and commercial revenues have not been publicly disclosed in the available coverage [Tech.eu, September 2026].

Over the next 12 to 18 months, the key watchpoints are whether Lightspring can qualify its process with industrial partners, translate co-design work into named manufacturing programs, and scale the organization toward the roughly 12-person team referenced in coverage without losing process reliability [Tech.eu, September 2026]. For investors, the attraction is clear, a narrowly scoped but meaningful bottleneck in photonic manufacturing, while the central diligence burden remains equally clear: independent proof that the fabrication method can survive the jump from lab-grade performance to repeatable industrial throughput [Tech.eu, September 2026] [Lightspring].

No independent source found -- Core funding facts are supported by Tech.eu, but several product differentiation and platform claims in this section rely on company materials and lightly corroborated media coverage.

Taxonomy Snapshot

Axis	Value
Stage	Seed
Business Model	B2B
Industry / Vertical	Deeptech
Technology Type	Hardware
Geography	Western Europe
Growth Profile	Venture Scale
Founding Team	Co-Founders (3+)
Funding	Seed, total disclosed approximately $3,350,000 [Tech.eu, September 2026]

Company Overview

PUBLIC Lightspring presents itself as a photonics company focused on 3D optical interconnects for photonic integrated circuits, with its public materials centering on the manufacturing layer rather than chip design itself [Lightspring]. The company is based in Besançon, France, according to its website and supporting company profiles tied to the founding team [Lightspring] [LinkedIn].

The founding record is thin but directionally consistent. Public company materials describe the technical thesis, while founder attribution is corroborated by Adrià Grabulosa's LinkedIn profile, which identifies Grégoire Bonnat, Adrià Grabulosa, and Daniel Brunner as co-founders [LinkedIn]. Public reporting also links the company's technical roots to earlier scientific work associated with the FEMTO-ST Institute in Besançon, though that institutional link is better treated as research origin than as a corporate milestone [AIPressroom].

The clearest dated milestone in the public record is the September 2026 seed financing announcement. That round was reported at €3.1 million, with Tech.eu also reporting a €350,000 i-Lab grant and more than €3.5 million in total financing including non-dilutive support [Tech.eu, September 2026]. In practical terms, the public chronology still starts with financing rather than a long operating history, which makes this an early company with a product narrative that is more developed than its disclosed commercial record [Lightspring] [Tech.eu, September 2026].

One source, partially checked -- Company description and headquarters are supported by the company website, while founding-team details and milestone chronology rely on partial corroboration from LinkedIn and one primary financing report.

The Product and the Stack

MIXED Lightspring is taking aim at a narrow but expensive step in photonics manufacturing: getting light in and out of the chip with less loss and less assembly friction. Public materials describe the company as designing and fabricating 3D optical interconnects for photonic integrated circuits using two-photon polymerization, or 2PP, with an initial focus on microlenses, 3D waveguides, and related optical-coupling structures built directly on photonic chips [Lightspring] [Tech.eu, September 2026]. Press coverage and company materials consistently frame the wedge around fiber-to-chip coupling, chip-to-chip coupling, and beam shaping rather than the underlying photonic chip itself [FW.media] [b2match.com, retrieved 2026].

The technical claim that matters is process integration. According to coverage and company descriptions, Lightspring uses 2PP, described as an additive 3D lithography technique, to fabricate optical structures directly on the chip surface in a single step, with the stated goal of turning photonic packaging into a more programmable manufacturing stage [Graft and Grit] [Lightspring]. That framing is directionally plausible because packaging and coupling are widely treated as a cost and yield constraint in photonics, and Tech.eu reports that Lightspring is specifically targeting a bottleneck that can account for roughly half of a photonic chip's cost [Tech.eu, September 2026]. Still, the public record here is early: there are no independently verified performance benchmarks, yield data, customer qualification results, or published side-by-side comparisons against incumbent packaging approaches in the materials reviewed [Tech.eu, September 2026] [Lightspring].

The announced use of proceeds gives a partial read on where the platform stands operationally. Tech.eu reports that the seed financing is intended to move the process from laboratory work toward industrial production, including development of a process design kit and design tools, qualification with industrial partners, and team expansion to about 12 people [Tech.eu, September 2026]. That suggests a company still proving repeatability and manufacturability, not one already selling a fully standardized production stack at scale, which is an important distinction for investors evaluating technical risk [Tech.eu, September 2026].

One source, partially checked -- Product scope is corroborated across the company website and independent press, but key technical performance claims remain company-described and public validation is still limited.

The Market They Are Entering

Publicly reported Photonics packaging is attracting more attention because the bottleneck has shifted away from chip design alone and toward how light gets on and off the chip at production scale, a constraint Lightspring explicitly targets [Tech.eu, September 2026] [FW.media].

The difficulty here is that there is no cited third-party TAM study in the provided source set for 3D optical interconnects as a standalone market, so any sizing claim would overreach the evidence. What the public record does support is a narrower market description: Lightspring is aimed at photonic integrated circuit manufacturing, specifically the optical input/output and packaging layer, with an initial focus on microlenses, 3D waveguides, and related coupling structures written directly onto chips [Tech.eu, September 2026] [FW.media] [Graft and Grit]. In practical terms, that places the company inside the photonic packaging toolchain rather than the broader semiconductor equipment stack, and its nearer addressable spend appears tied to PIC makers and industrial photonics companies pursuing higher-volume assembly and qualification workflows [Tech.eu, September 2026].

A useful way to read demand is through the problem statement repeated across coverage. Multiple sources describe coupling and packaging as a material cost and performance constraint, with Tech.eu reporting that packaging can account for roughly half of a photonic chip's cost [Tech.eu, September 2026]. If that figure is directionally right, the market tailwind is less about one new end-market and more about a manufacturing pain point that should recur anywhere PIC adoption rises, whether in communications, sensing, or other industrial photonics applications, although the provided sources stop short of breaking those verticals out with spend data [Tech.eu, September 2026] [FW.media].

The adjacent markets are easier to identify than to quantify from the current evidence. Lightspring's process, according to public descriptions, sits alongside conventional photonic packaging, optical coupling components, and process design tooling, since the company also plans to develop a process design kit and design tools for industrial qualification [Tech.eu, September 2026]. That suggests the substitute set is not only other interconnect approaches, but also incumbent assembly and alignment workflows that manufacturers already use to connect fibers, chips, and beam-shaping elements in production [FW.media] [Graft and Grit].

Macro and policy support are visible, even if still early. The company disclosed a €350,000 i-Lab grant as part of more than €3.5 million in total financing, which indicates at least some public-sector willingness in France to fund photonics manufacturing infrastructure at the pre-scale stage [Tech.eu, September 2026]. Just as important, the stated use of proceeds centers on moving from laboratory work toward industrial production, qualifying processes with partners, and expanding the team, all of which points to a market where manufacturability and standardization matter as much as raw device performance [Tech.eu, September 2026] [FrenchWeb].

Market lens	Publicly supported claim	Source
Core market	Photonic integrated circuit packaging and optical coupling structures	[Tech.eu, September 2026] [FW.media]
Cost driver	Packaging can account for roughly half of a photonic chip's cost	[Tech.eu, September 2026]
Buyer set	Industrial photonics companies and PIC manufacturers, according to reported plans for co-design and qualification	[Tech.eu, September 2026]
Adjacent layer	Process design kits and design tools tied to industrial qualification	[Tech.eu, September 2026]
Policy signal	€350,000 i-Lab grant within total financing of more than €3.5 million	[Tech.eu, September 2026]

The evidence supports a real pain point and a plausible procurement path, but not a clean bottom-up market model yet. For now, the market case rests on the importance of packaging economics inside photonics manufacturing, not on a published standalone category size for Lightspring's specific 3D interconnect approach.

One source, partially checked -- Section relies primarily on Tech.eu, with partial corroboration from FW.media, Graft and Grit, and FrenchWeb; no independent third-party market size report was provided.

The Competitive Field

MIXED Lightspring is positioning itself against both photonic component companies and packaging-layer specialists by focusing narrowly on the optical I/O bottleneck, namely the coupling structures that connect fibers, chips, and beams to photonic integrated circuits rather than the PIC device stack itself [Tech.eu, September 2026] [FW.media].

Company	Positioning	Stage / Funding	Notable Differentiator	Source
Lightspring	3D optical interconnects and coupling structures for photonic integrated circuits	Seed, €3.1 million equity round announced September 2026, plus €350,000 i-Lab grant and more than €3.5 million total financing	Uses two-photon polymerization to fabricate microlenses, 3D waveguides, and related optical structures directly on chip surfaces in a single step	[Tech.eu, September 2026] [FW.media] [Graft and Grit]
Effect Photonics	Photonic communications company offering integrated optical solutions	Funding and stage not established in the provided materials	Named competitor in the structured facts; direct overlap is most likely at the PIC and optical interconnect layer, though the precise product overlap is not confirmed in the cited materials	[Structured facts]

The competitive map is still forming, but it is already possible to separate three lanes. Second are packaging and assembly approaches that solve coupling through process engineering rather than through on-chip 3D fabrication, which is the alternative Lightspring is implicitly attacking when it says packaging can account for roughly half of a photonic chip's cost [Tech.eu, September 2026]. Third are adjacent substitutes inside foundries or outsourced assembly flows, where standard microlens, alignment, and coupling techniques may remain good enough for many applications even if they are less elegant than direct-write 3D structures [FW.media] [Tech.eu, September 2026].

Lightspring's edge today appears technical rather than commercial. The company is building around two-photon polymerization and a direct-write process that, according to the company and funding coverage, can place microlenses, 3D waveguides, and other coupling structures directly on the chip surface in a single step [Lightspring, retrieved 2024] [Graft and Grit] [Tech.eu, September 2026]. That matters because a packaging-layer wedge can be defensible if it becomes embedded in customer design flows and process design kits, both of which Lightspring says it intends to develop as it moves from lab work toward industrial qualification [Tech.eu, September 2026]. The durability of that edge is still unproven, though, because the present evidence rests more on process promise and research lineage tied to FEMTO-ST than on disclosed production wins, named customers, or installed manufacturing channels [AIPressroom] [Tech.eu, September 2026].

The clearest exposure is that Lightspring does not yet appear to own the customer interface at the system or module layer. Lightspring is also exposed if incumbent packaging methods continue to clear performance thresholds at lower qualification risk, because a novel process must win not only on optical performance but also on yield, repeatability, and compatibility with foundry recipes and assembly lines, all areas where the company's public evidence remains early [Lightspring, retrieved 2024] [Tech.eu, September 2026].

The most plausible 18-month scenario is a split market rather than a clean take-all outcome. Lightspring is the likely winner if industrial partners validate its process across multiple foundry recipes and if its proposed design-tool and process-kit work makes integration straightforward for PIC manufacturers [Tech.eu, September 2026] [Lightspring, retrieved 2024]. In that case, the company could become a packaging-layer enabler that sits inside other firms' manufacturing flows rather than competing head-on as a full-stack photonics vendor. eu, September 2026]. Under that second path, Lightspring would be the relative loser, not because the technical thesis is disproven, but because adoption timing would slip faster than its seed capital can absorb.

Thinly sourced -- This section uses public reporting from Tech.eu, FW.media, Graft and Grit, Lightspring's website, and research-origin references, but the competitive set is thinly disclosed and the only named competitor in the provided materials lacks source-grounded detail beyond its name.

Opportunity

PUBLIC

If Lightspring can turn photonic packaging from a bespoke assembly problem into a repeatable manufacturing step, the prize is not a niche component supplier but a position inside the production flow of photonic chips themselves [Tech.eu, September 2026] [Lightspring].

The headline opportunity is straightforward: become the default process layer for optical coupling on photonic integrated circuits, first in high-friction packaging steps and later across broader chip-to-chip, fiber-to-chip, and beam-shaping workflows [FW.media] [Tech.eu, September 2026]. That outcome is still early, but it is not purely aspirational. Public reporting consistently places Lightspring at the packaging bottleneck, with its initial focus on microlenses, 3D waveguides, and related structures fabricated directly on-chip using two-photon polymerization, and it ties the seed financing to process qualification, design tools, and industrialisation rather than to a loose research agenda [Tech.eu, September 2026] [Graft and Grit] [Lightspring].

There are a few credible paths from an enabling technology to a much larger company. The common thread is that Lightspring does not need to win the whole photonics stack. It needs to become hard to remove from one expensive, failure-prone manufacturing step, then widen from there [FW.media] [Tech.eu, September 2026].

Scenario	What happens	Catalyst	Why it's plausible
Packaging standard layer	Lightspring becomes a repeat supplier of on-chip optical coupling structures for PIC manufacturers and packaging partners	Successful process qualification with industrial partners and rollout of co-design programmes [Tech.eu, September 2026]	The company is explicitly raising capital to qualify production and work with industrial partners, while its product is aimed at a bottleneck reported to account for roughly half of photonic chip cost [Tech.eu, September 2026]
Foundry-adjacent design platform	Its process design kit and design tools become embedded upstream, making Lightspring part of how photonic devices are designed for manufacturability	Release and adoption of the reported process design kit and related tooling [Tech.eu, September 2026]	Public coverage says the seed round will fund a process design kit and design tools, which suggests an ambition to influence design decisions before packaging begins [Tech.eu, September 2026]
Cross-foundry interconnect specialist	Lightspring becomes the preferred specialist for coupling structures across multiple materials and foundry recipes	Proof that the process works across varied fabrication environments at industrial scale [Lightspring]	The company states that its process is built to work across foundry recipes, materials, and use cases. That is company-sourced, so it needs validation, but if borne out it would widen the addressable footprint materially [Lightspring]

The compounding mechanism here is process embedment. If Lightspring helps design and qualify optical coupling structures for one customer programme, it gains application knowledge in tolerances, geometries, and packaging constraints that should make the next programme faster to scope and harder for a customer to switch away from, especially if the process design kit becomes part of the engineering workflow [Tech.eu, September 2026]. The public evidence for an early flywheel is limited, but the stated plan to build design tools alongside manufacturing qualification matters because it points to software and process lock-in, not only fabrication revenue [Tech.eu, September 2026].

The size of the win is best framed conditionally because no public market-sizing dataset was provided in the source pack. A credible upside case is that Lightspring becomes valuable as enabling infrastructure for a photonics supply chain that is moving from lab work toward scaled production, with strategic value tied less to current revenue and more to control of a painful manufacturing step [Tech.eu, September 2026] [EU-Startups, September 2026]. If the "Packaging standard layer" scenario plays out and the company becomes a preferred process partner across multiple PIC programmes, the outcome could support venture-scale value creation in the low hundreds of millions of dollars or more (scenario, not a forecast), particularly if acquirers or strategic investors view packaging yield and coupling performance as gating constraints on photonics adoption. That valuation framing is an analytical inference from the strategic role described in reporting, not a public comparable anchored in this source set, so it should be treated as directional rather than evidenced.

Thinly sourced -- Core product and financing facts are supported by Tech.eu and related public coverage, but the upside framing and cross-foundry expansion logic rely partly on company-sourced claims and analytical inference.

Sources