Network Card Single-Mode Optical Module

A single-mode optical module is a fiber transceiver used in network cards to enable long-distance, high-speed data transmission over single-mode fiber (SMF).OverviewA single-mode optical module is a pluggable transceiver that fits into a fiber network interface card (NIC) to provide connectivity over single-mode fiber (SMF). Unlike multimode fiber, SMF supports longer distances—typically up to 10 km or more—with minimal signal loss, making it ideal for data centers, enterprise networks, and long-haul connections .Key FeaturesSpeed and Form Factor: Commonly available in 1G (SFP), 10G (SFP+), 25G (SFP28), and 100G (QSFP28) variants .Wavelength: Single-mode modules typically operate at 1310 nm or 1550 nm, depending on distance and application .Duplex Communication: Uses dual LC connectors for transmit and receive channels, or in some cases, single-strand communication with wavelength-division multiplexing (e.g., 1000BASE-BX10-D/U) .Compatibility: Works with PCIe fiber NICs that support SFP/SFP+ slots. Examples include Intel-based NICs like the 82599EN or Intel X520-DA1 .Monitoring: Many modules support Digital Optical Monitoring (DOM) to track optical power, temperature, and voltage in real time .Practical ConsiderationsDistance: Single-mode fiber modules are suitable for long-distance links, typically ranging from 2 km to 10 km or more, depending on the module and fiber type (OS2) .Installation: Modules are hot-swappable, allowing easy replacement without shutting down the system .Cabling: Use 9/125 µm OS2 fiber for single-mode connections. Duplex LC patch cables are standard, but single-strand solutions exist for specific BX modules .NIC Integration: Fiber NICs with single-mode SFP/SFP+ slots can also support DAC (Direct Attach Copper) or AOC (Active Optical Cable) for short-range connections, providing flexibility in network design .Example Products10G SFP+ Single-Mode Module: Supports 10 Gb/s, 1310 nm wavelength, up to 10 km over OS2 fiber, compatible with Intel 82599EN NICs .Gigabit Single SFP Port NIC: Uses Intel I210 chip, supports single-mode and multimode SFP modules, PCIe x1/x4/x8 slots, and multiple operating systems .SummaryA single-mode optical module enables high-speed, long-distance fiber connectivity when installed in a compatible NIC. It is ideal for enterprise and data center environments where low latency, high bandwidth, and long reach are required. When selecting a module, consider speed, wavelength, distance, NIC compatibility, and monitoring features to ensure optimal network performance .