Meaning of the SN code of the optical module
The SN code refers to a specific type of Very Small Form Factor (VSFF) duplex optical connector used in high-density fiber optic networks.
Overview of SN Connectors
The SN connector is a compact, ceramic-based fiber optic connector designed for both single-mode and multi-mode fibers up to 2.0mm in diameter . It uses the same 1.25mm ferrule technology as the standard LC connector but with significantly reduced outer dimensions, allowing for higher packing density in patch panels and transceivers . The SN connector supports Base-2 and Base-8 configurations, making it compatible with both single-lane optics like SFP+ and multi-lane pluggable optics such as QSFP-DD or OSFP .
Key Features
- High Density: Up to four SN connectors can be connected to a single QSFP-DD or OSFP transceiver, enabling quadruple switch density without additional cassettes or fan-out cables .
- Flexibility: The connector includes a pullable, flexible boot that allows bending from straight to 90°, ensuring accessibility even in tightly packed panels .
- Compatibility: SN connectors are used in modern optical modules such as PSM4, SR4, DR4, DR4+, and SR4.2, supporting data rates up to 400G, 800G, and even 1.6TB .
- Simplified Network Design: SN links reduce the need for transition cassettes or fan-outs, lowering deployment complexity and optical attenuation .
Applications
SN connectors are primarily used in hyperscale data centers and leaf-spine network topologies, where high-density, high-speed connections are required. They allow operators to achieve mega-densification while maintaining traceability and ease of maintenance .
Summary
In essence, the SN code identifies a high-density, small-form-factor optical connector that enhances fiber optic network efficiency, supports modern high-speed transceivers, and simplifies cabling infrastructure. It is a key component in next-generation optical modules designed for data centers and high-performance networking environments .
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