Short-distance switch optical module

Short-reach (SR) optical modules typically support distances up to 300 meters over multimode fiber (MMF), ideal for intra-rack or nearby switch connections.

Overview of S

R Optical ModulesSR (Short Reach) modules are designed for short-distance connectivity within data centers or network facilities. They generally operate at 850nm wavelength using multimode fiber (MMF), which allows multiple light paths and is cost-effective for short links. These modules are commonly used for: Switch-to-switch connections within the same rack or rowSwitch-to-server links in dense deploymentsIntra-data hall connections where fiber runs are limitedTypical DistanceThe maximum reach of SR modules depends on the data rate and fiber type: 1G/10G SR modules: up to 300 meters on OM3/OM4 MMF25G/40G SR modules: typically up to 100–150 meters on MMFHigher-speed SR modules (e.g., 100G SR4): distances may be shorter due to modal dispersion These distances are sufficient for most short-range deployments inside a single data center or between adjacent racks.

Advantages of Using S

R ModulesCost-effective: SR modules are generally less expensive than long-reach (LR) modules, making them ideal for dense, short-range networks. High port density: Smaller form factors like SFP+ or QSFP+ allow more connections per switch. Optimized performance: Designed to minimize signal loss over short distances, ensuring reliable throughput.

Deployment Considerations

Fiber type: Ensure MMF (OM3 or OM4) is used; SR modules are not compatible with single-mode fiber (SMF). Connector compatibility: Most SR modules use LC connectors; verify switch ports match. Distance planning: Avoid over-specifying LR modules for short links, as this increases cost without performance benefit.

In summary, for short switch-to-switch connections, SR optical modules are the preferred choice, supporting distances up to 300 meters over multimode fiber, providing a balance of cost, performance, and reliability.