As AI computing clusters continue to expand, data center interconnect and metro computing scheduling traffic are experiencing explosive growth. Traditional C-band spectrum resources are becoming increasingly saturated and can no longer support the higher bandwidth and larger capacity demands of AI computing cluster networks. Against this backdrop, Accelink has launched the 800G L Band OSFP ZR/ZR+ pluggable coherent module, extending the available spectrum to the L-band and nearly doubling single-fiber capacity without adding new fiber, fully unlocking the potential of existing fiber infrastructure. With its unique spectrum expansion advantage, this product has become the preferred solution for the smooth expansion of computing optical networks.
CIOE Major Debut: Demo Highlights Impressive
Accelink will conduct a live Demo of the 800G L Band OSFP ZR/ZR+ coherent module during CIOE 2026, showcasing the latest technological achievements to the industry. As a domestically debuted product, the core highlight of this module lies in Accelink's self-developed L-Band optical devices: through high-power miniaturized optical devices, it achieves L-Band output power better than 0 dBm within a compact OSFP package, and possesses stable mass-production capability. This breakthrough not only demonstrates Accelink's technical strength in the field of ultra-high-speed coherent optical modules, but also provides strong support for the autonomous and controllable domestic optical communications industry chain.
Industry Imperative: C-Band Saturation Makes L-Band a Key Breakthrough
Currently, the C-band spectrum is approaching its carrying capacity limit. Relying solely on the optimization of existing frequency bands makes it difficult to match the ultra-large bandwidth, long-distance, and high-stability transmission requirements of the computing era, becoming a bottleneck restricting the large-scale deployment of 800G networks. The demand for industry upgrading is clear: it is necessary to achieve a leapfrog improvement in bandwidth while remaining compatible with existing networks to protect customers' existing investments.
The L-band can effectively expand the system's available spectrum window, breaking the single-fiber transmission capacity bottleneck, and is currently the mainstream evolution direction for the large-scale commercial deployment of 800G.
Hardcore Technology: Self-Developed Devices, Standardized Architecture, High Performance and Strong Compatibility
Accelink's 800G L Band OSFP ZR/ZR+ coherent module features the following:
Core Devices Autonomous and Controllable：The module adopts self-developed L Band optical devices, achieving full-chain independent design and manufacturing from the core coherent optical engine to key optical components, ensuring supply chain security and continuous product iteration capability.
Spectrum Expansion Capability：The module supports L-band tunable coherent transceiver, and when paired with DWDM systems can multiply single-fiber transmission capacity, enabling rapid bandwidth expansion without new fiber infrastructure and greatly improving spectrum resource utilization.
Scale Across Application：Supports upgrade scenarios where single-fiber capacity doubles from 25.6T to 51.2T. Through the parallel multiplexing of L-band and C-band, capacity doubling is achieved without increasing fiber resources, perfectly adapting to the cross-domain interconnection needs of large-scale GPU clusters.
Standardized Compatibility：Equipped with a mature coherent optical engine and high-performance DSP architecture, fully complying with OIF 800ZR, OpenZR+, OpenROADM and other common industry standards. It can smoothly connect to existing networks, helping achieve a seamless upgrade from 400G to 800G and maximizing the protection of existing hardware investments.
Transmission Performance Optimization：Excellent OSNR transmission performance, perfectly adapting to long-haul amplified DWDM link scenarios; relying on the lightweight OSFP pluggable form factor, it balances low power consumption with the flexible adaptation of multi-rate services, delivering outstanding scenario adaptability and operational stability.
Value Implementation: Empowering the High-Speed Upgrade of Computing Networks
Accelink's 800G L Band OSFP ZR/ZR+ coherent module can be widely applied in the following scenarios:
Cloud Data Center DCI：Supports high-speed interconnection across regional data centers, carrying AI training, big data and other high-throughput services, effectively reducing transmission costs.
Metro Backbone Transmission：Meets metro and long-haul large-bandwidth scheduling needs, improving global computing scheduling efficiency.
Campus Computing Networking：With low power consumption and easy deployment features, it adapts to edge computing networking needs.
As computing infrastructure construction continues to accelerate, L-band 800G coherent technology has become one of the core development directions of next-generation optical networks. With core advantages such as self-developed L Band devices, spectrum expansion, high compatibility, low power consumption, and easy deployment, Accelink's 800G L Band OSFP ZR/ZR+ module debuted at CIOE 2026 will continue to empower high-speed, efficient, and green intelligent computing optical networks, building a solid foundation for digital computing transmission.
