10GBASE-ER SFP Module Explained: Distance, Specs & Use Cases
Learn what a 10GBASE-ER SFP module is, how it works, key specifications, transmission distance, and when to use it in enterprise networks
10 Gigabit Optical Module Transmission Distance Standard
10G optical modules have standardized transmission distances ranging from 300 meters to 80 kilometers, depending on module type, wavelength, and fiber type.Common 10G SFP+ Module Types and Distances10GBASE-SR (Short Reach): Designed for multimode fiber (MMF), typically OM3 or OM4, with a maximum reach of up to 300 meters. Ideal for data center and high-density applications where short distances are sufficient .10GBASE-LRM (Long Reach Multimode): Supports up to 220 meters over standard multimode fiber (OM1/OM2/FDDI-grade) and requires a mode conditioning patch cord for older fiber types .10GBASE-LR (Long Reach): Operates over single-mode fiber (SMF) at 1310 nm, with a maximum distance of 10 km, suitable for campus networks or metro-area connections .10GBASE-ER (Extended Reach): Uses SMF at 1550 nm and supports distances up to 40 km, designed for metro-scale or inter-building links where signal attenuation and reliability are critical .10G BiDi (Bidirectional): Transmits 10 Gb/s over a single strand of SMF using wavelength-division multiplexing (WDM), effectively halving fiber usage. Distances vary depending on the module, typically up to 10 km .Wavelength and Fiber Considerations850 nm: Common for SR modules over MMF.1310 nm: Used for LR modules over SMF.1550 nm: Used for ER modules over SMF for extended distances .Summary TableModule TypeFiber TypeWavelengthMax Distance10GBASE-SRMMF (OM3/OM4)850 nm300 m10GBASE-LRMMMF (OM1/OM2/FDDI)1310 nm220 m10GBASE-LRSMF1310 nm10 km10GBASE-ERSMF1550 nm40 km10G BiDiSMF (single strand)1270/1330 nm~10 kmPractical Deployment NotesShort-reach modules (SR/LRM) are cost-effective for intra-data center connections.Long-reach modules (LR/ER) are preferred for campus or metro-area networks where fiber runs exceed 1 km.BiDi modules reduce fiber count and simplify cabling, useful for retrofitting existing single-strand fiber infrastructure . By selecting the appropriate 10G module type based on fiber type, wavelength, and required distance, network designers can ensure reliable high-speed transmission while optimizing cost and infrastructure.
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10 Gbit/s SFP+ Optical Modules
10 Gbit/s SFP+ optical modules apply to 10 GE optical ports. The wavelength can be 850 nm, 1310 nm, or 1550 nm, and the transmission distance ranges from 0.5 km (0.31 mi) to 80 km (49.71 mi).
10 Gigabit Ethernet
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Ethernet
Fiber optic variants of Ethernet (that commonly use SFP modules) are also very popular in larger networks, offering high performance, better electrical isolation and longer distance (tens of kilometers
SFP+, XFP, QSFP+, DAC Twinax Cable 10Gtek Transceivers Co., Ltd
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SFP-10G-SR vs LRM vs LR: Which 10G Module Should
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10 Gigabit Ethernet
10 Gigabit Ethernet (10GE, 10GbE, or 10 GigE) is a group of computer networking technologies for transmitting Ethernet frames at a rate of 10 gigabits per second. It was first defined by the IEEE
Standards for 10Gb Ethernet: A Comprehensive Overview
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SFP Distance Explained: Real-World Range, Limits, and Optics
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What is the longest transmission distance of a 10G
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10 Gigabit Ethernet Fiber Design Considerations
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10GBASE-ER SFP Module Explained: Distance, Specs & Use Cases
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10GBASE-ER Application Overview
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Multimode Fiber and 10GE
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KD — High-Speed Optical Connectivity Semiconductors
KD designs semiconductor ICs for multi-gigabit optical networking over fiber optics. Solutions for automotive, industrial, and consumer connectivity.
10G Optical Modules: Short-Range vs. Long-Range
Understand short-range and long-range 10G optical modules in terms of distance, budget, energy use, and scalability to make the right choice.