Data Centers Shift from MPO to MMC for Enhanced Connectivity

As AI model training clusters demand exponentially growing computing power, "fiber congestion" within data centers has emerged as a critical physical bottleneck. In today's space-constrained server racks, the challenge of delivering denser bandwidth within smaller physical dimensions has become a pivotal focus for optical communication technology.

MPO (Multi-fiber Push-On) connectors have long served as the standard for high-density data center cabling, with MTP (Multi-fiber Termination Push-on) connectors representing an enhanced version featuring improved mechanical and optical performance. However, as 800G and 1.6T Ethernet standards advance, the physical limitations of MPO/MTP connectors have become apparent—their relatively large size restricts interface density on circuit boards, making them increasingly unsuitable for next-generation switches requiring ultra-dense port configurations.

The emerging MMC (Miniature Multicore Connector) interface addresses these challenges through miniaturization and high integration. Compared to MPO connectors, MMC features a more compact design that can multiply connection density within the same panel space. This innovation not only optimizes cabling real estate but also improves data center cooling efficiency by reducing airflow obstruction caused by fiber jumpers.

In the development of 800G optical transceiver modules, MMC interfaces have become crucial for achieving high-density interconnects. This new interface design supports smaller form-factor pluggable modules while simplifying fiber management processes—reducing operational complexity during large-scale deployments. For AI-driven high-performance computing (HPC) clusters, this high-density solution translates to lower latency and higher bandwidth utilization, providing essential physical infrastructure for computational scaling.

• Physical Dimensions: MMC's significantly smaller size enables more ports per line card, effectively solving space constraints.
• Scalability: MMC interfaces support more flexible modular designs, better adapting to next-generation hyperscale data center architectures.
• Performance: Despite its compact size, MMC maintains comparable or superior stability to high-performance MPO connectors in critical metrics like insertion loss and return loss.

MMC technology represents not merely a replacement for MPO, but an evolutionary solution specifically designed for high-density, high-bandwidth computing environments. As optical communications continue advancing toward smaller form factors and higher densities, MMC stands poised to become a defining component of future data center interconnect standards—enabling new levels of performance in computational infrastructure.