Lightmatter introduced its Passage L20 optical engine, targeting high-density optical interconnects for AI data centers as bandwidth requirements push beyond the limits of electrical signaling. The new module delivers 6.4 Tbps per direction and supports both scale-up and scale-out architectures, including XPU-to-XPU clustering and switch-based fabrics. The company positions the L20 as a flexible building block for next-generation AI infrastructure, where switch capacities are exceeding 100 Tbps and port counts are moving beyond 576.
The Passage L20 is designed as a unified optical engine supporting both Near-Packaged Optics (NPO) and On-Board Optics (OBO) integration models. It leverages bidirectional (BiDi) optical transmission to double fiber bandwidth density and reduce fiber count by 50% compared to traditional duplex DR optics. By using IEEE 802.3dj-compliant 224G PAM4 electrical interfaces, the module enables drop-in compatibility with existing ASICs and switch silicon, allowing deployment without redesigning host systems.
Lightmatter also positions the L20 within its broader Passage portfolio, which spans pluggable optics, NPO/OBO modules, and future 3D co-packaged photonics. The module supports 32 optical ports at 200 Gbps per lane and is designed for seamless PCB integration using a 2000-pin BGA form factor. Sampling is expected to begin in late 2026, with demonstrations underway at OFC 2026 in Los Angeles.
- Targets high-density AI interconnects for scale-up and scale-out architectures
- Supports NPO and OBO deployment models for flexible system design
- BiDi optics reduce fiber count by 50% and double bandwidth density
- IEEE 802.3dj-compliant 224G PAM4 enables drop-in integration
- 32 ports at 200 Gbps per lane for compatibility with next-gen switches and XPUs
- Designed for XPU-to-XPU, XPU-to-switch, and hierarchical fabrics
- Sampling expected in late 2026
| Parameter | Specification |
|---|---|
| Total Bandwidth | 6.4 Tbps (each direction) |
| SerDes Line Rate | 212.5 Gbps PAM4 |
| Optical Transmission | 2-wavelength BiDi (1311 / 1331 nm), IEEE 802.3dj DR |
| Ports | 32 optical ports @ 200 Gbps per lane |
| Power (TDP) | 30W max (~3.0 pJ/bit) |
| Form Factor | 2000-pin BGA (BiDi) |
| Integration Modes | NPO (near-package), OBO (on-board) |
| Standards | IEEE 802.3dj compliant |
| Availability | Sampling expected late 2026 |
“The demand for our photonic technology is expanding rapidly across a wide range of AI applications that require immediate, large-scale deployment. With the introduction of the Passage L20 optical engine, we are offering a versatile, standards-based platform that complements our advanced 3D-integrated roadmap. This allows our partners to accelerate their time-to-market using existing chassis architectures, providing a validated and highly efficient path to mass deployment of photonic interconnects across the entire data center,” said Nick Harris, Ph.D., founder and CEO of Lightmatter.
🌐 Analysis: Lightmatter’s introduction of BiDi optical engines at 224G PAM4 aligns with a broader industry shift toward higher radix switching and denser optical interconnects, as hyperscalers push beyond 100 Tbps fabrics. The ability to reuse existing electrical interfaces lowers integration friction, which has been a key barrier for NPO and CPO adoption.
The L20 also reflects growing momentum behind hybrid optical architectures—bridging pluggables, NPO, and future co-packaged optics—rather than a single-step transition. ity and manufacturability will shape adoption timelines alongside raw bandwidth gains.
