SX SFP Module Guide: SX vs LX vs SR Differences Explained
Confused by fiber acronyms? Learn the wavelength, distance, and fiber type differences for SX SFP modules. Get factory-direct 1G transceivers from Wolontek.
Sx optical module
The SX Optical Module is a 1 Gigabit short-wavelength SFP transceiver designed for short-range multimode fiber connections using an 850nm VCSEL laser.OverviewThe SX Optical Module (Short Wavelength Small Form-factor Pluggable, 1000BASE-SX) is a hot-swappable device that converts electrical signals into optical signals for high-speed data transmission over multimode fiber (MMF) networks. It is primarily used for short-distance connections within buildings, server rooms, or adjacent racks, supporting distances up to 550 meters depending on fiber type and quality .Key SpecificationsWavelength: 850 nm (infrared light)Data Rate: 1 Gbps (1000BASE)Fiber Type: Multimode fiber (OM1, OM2, OM3, OM4, OM5)Maximum Distance:OM1/OM2 (50–62.5 µm core): 220–275 metersOM3/OM4 (laser-optimized): up to 550 metersLaser Technology: VCSEL (Vertical-Cavity Surface-Emitting Laser), which emits light perpendicular to the chip surface, allowing efficient coupling into multimode fibers and lower manufacturing costs .Form Factor: SFP (Small Form-factor Pluggable), compatible with most enterprise switches and routers .AdvantagesHot-swappable: Can be installed or replaced without shutting down the network.Cost-effective: Uses VCSEL technology, reducing production costs compared to long-range DFB or FP lasers.Low latency: Suitable for high-frequency trading, real-time data replication, and enterprise LANs.Standards Compliance: Fully compliant with IEEE 802.3z and SFP MSA protocols .Use CasesConnecting switches within the same building or data center.Short-range interconnects between racks or server clusters.Industrial automation networks requiring reliable, low-latency fiber links.CompatibilitySX modules are strictly multimode and will not function over single-mode fiber. They are compatible with a wide range of networking brands, including Cisco, HPE, Juniper, Arista, and others . For optimal performance, modern OM3/OM4 multimode fibers (aqua-colored) are recommended. In summary, the SX Optical Module is the standard choice for short-range, high-speed fiber connections in enterprise and data center environments, offering reliable performance, ease of installation, and cost efficiency.
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