STC-40028 | 800G QSFP-DD LPO SR8 Optical Transceiver

Product Overview

The STC-40028 from Swedish Telecom Opto’s LPO Series is a high-performance 800 Gb/s QSFP-DD SR8 optical transceiver optimized for short-reach, high-bandwidth data-centre and AI workloads. Utilizing Linear Pluggable Optics (LPO) architecture, the module operates without a DSP, leveraging host ASIC processing to deliver exceptional power efficiency and minimal latency. This makes the STC-40028 an ideal choice for organizations seeking to scale AI/ML and HPC infrastructures while maintaining sustainability and thermal efficiency.

Supporting 8 × 100 Gb/s PAM4 channels operating at 850 nm VCSEL wavelengths, the module delivers reliable connectivity up to 50 m over multimode fiber (MMF). It complies with IEEE 802.3db and CMIS 4.0 specifications and is designed for interoperability with leading linear-drive host systems supporting CEI-112G-LINEAR-PAM4 electrical interfaces.

Key Features

• 800 Gb/s aggregate data rate across 8 × 100 Gb/s PAM4 lanes
• Linear-drive (LPO) architecture — no DSP, ultra-low latency and power
• ≤ 5.5 W maximum power consumption
• Supports up to 50 m transmission distance over multimode fiber (MMF)
• Hot-pluggable QSFP-DD form factor for high-density environments
• 850 nm VCSEL laser technology for SR8 operation
• Compliant with IEEE 802.3db and QSFP-DD MSA
• Supports CMIS 4.0 management interface
• Operating temperature: 0 °C – 70 °C
• RoHS 2.0 compliant and EU-tested

Applications

• Short-reach 800G interconnects in AI and ML clusters
• Data-centre leaf–spine and aggregation switching fabrics
• HPC and cloud computing networks
• Intra-rack and rack-to-rack connectivity in high-density environments
• Power-optimized upgrades for 400G to 800G infrastructures

Standards & Compliance

• IEEE 802.3db 800GBASE-SR8
• CEI-112G-LINEAR-PAM4 electrical interface
• CMIS 4.0 management specification
• QSFP-DD MSA mechanical specification
• RoHS 2.0 compliant

Specifications

Why Choose EU-Tested LPO Modules

Each STC-40028 module undergoes independent testing in European laboratories to validate power consumption, thermal performance, and host interoperability. EU validation ensures predictable, standards-compliant performance and provides data-centre operators with peace of mind when deploying advanced 800G optics across critical environments.