1km and 300m optical modules

Optical modules for 300 m typically use multimode fiber (MMF) at 850 nm, while 1 km modules use single-mode fiber (SMF) at 1310 nm or 1550 nm, supporting high-speed Ethernet connections.300 m Optical ModulesShort-range (300 m) optical modules are designed for multimode fiber (MMF) networks, commonly used in data centers, server rooms, and switch-to-switch interconnects. Key features include:Data rates: 1G, 10G, or higher (SFP/SFP+ modules)Wavelength: 850 nm (VCSEL-based)Fiber type: OM3 or OM4 multimode fiberStandards compliance: IEEE 802.3ae 10GBASE-SR, SFP+ MSAApplications: Short-distance interconnects, rack-to-rack connections, and intra-data center linksExamples: STC-10G-SR 10G SFP+ SR module supports up to 300 m over OM3 fiber, hot-pluggable, low power consumption, and full DDM functionality .1 km Optical ModulesMedium-range (1 km) optical modules are typically single-mode fiber (SMF) transceivers, suitable for campus networks, metro links, or longer intra-building connections. Key features include:Data rates: 1G, 10G, or higherWavelength: 1310 nm or 1550 nmFiber type: Duplex single-mode fiberStandards compliance: IEEE 802.3z 1000BASE-LX or 10GBASE-LRApplications: Inter-building connections, longer reach within enterprise networksExamples: 10GBASE-LR SFP+ modules can reach up to 1 km over duplex SMF, providing reliable high-speed Ethernet connectivity .Key DifferencesFeature300 m Module1 km ModuleFiber typeMultimode (OM3/OM4)Single-mode (SMF)Wavelength850 nm1310 nm or 1550 nmTypical useData center, short linksCampus, metro, inter-buildingCostLowerHigherPower consumptionLowModerateSummary300 m modules are optimized for short-range multimode fiber connections, ideal for high-density data center environments.1 km modules use single-mode fiber for longer reach, suitable for enterprise or campus networks.Both types support hot-pluggable SFP/SFP+ form factors and comply with relevant IEEE standards, ensuring interoperability with switches, routers, and optical Ethernet equipment . Choosing between 300 m and 1 km modules depends on fiber type, distance requirements, and network architecture.