{"id":2700,"date":"2026-05-12T03:08:57","date_gmt":"2026-05-12T03:08:57","guid":{"rendered":"https:\/\/lp.szlogic.cn\/products\/sfp-40km-10gbase-er-extended-reach-optical-module\/"},"modified":"2026-05-26T08:14:18","modified_gmt":"2026-05-26T08:14:18","slug":"sfp-40km-10gbase-er-extended-reach-optical-module","status":"publish","type":"post","link":"https:\/\/lp.szlogic.cn\/ru\/products\/sfp-40km-10gbase-er-extended-reach-optical-module","title":{"rendered":"SFP+ 40km (10GBASE-ER): Extended-Reach Optical Module Guide"},"content":{"rendered":"
\"SFP+<\/figure>\n\n\n\n

SFP+ 40km<\/a> (10GBASE-ER<\/a>) refers to a 10 Gigabit optical transceiver designed for extended-reach transmission up to 40 kilometers over single-mode fiber (SMF). These modules typically operate at a 1550 nm wavelength, use LC duplex connectors<\/a>, and support Digital Optical Monitoring (DOM\/DDM) for real-time performance visibility. In modern networks, SFP+ 40km optics are widely deployed in enterprise backbones, metro networks, data center interconnects, and storage area networks, where stable long-distance connectivity is critical.<\/p>\n\n\n\n

In this guide, you\u2019ll learn what SFP+ 40km really means, how 10GBASE-ER compares to alternatives like BX40<\/a>, and how to choose the right module based on distance, compatibility, and deployment environment\u2014helping you make an informed, engineering-level decision.<\/p>\n\n\n\n

\ud83d\udea9 <\/strong>What Is SFP+ 40km?<\/h2>\n\n\n\n

SFP+ 40km is a type of 10 Gigabit optical transceiver designed for long-distance data transmission up to 40 kilometers over single-mode fiber<\/a> (SMF). In most cases, this term specifically refers to the 10GBASE-ER (Extended-Reach) standard defined by the IEEE for 10G Ethernet networks.<\/p>\n\n\n\n

At a technical level, an SFP+ 40km module works by transmitting optical signals at a 1550 nm wavelength through low-loss single-mode fiber (typically OS2). It uses a duplex LC connector, meaning one fiber strand is used for transmission (TX) and another for reception (RX). With a typical optical link budget of around 15 dB, it can reliably support long-haul connections between network devices such as switches<\/a>, routers<\/a>, and storage systems.<\/p>\n\n\n\n

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SFP+ 40km = a 10GBASE-ER optical module used for 10 Gbps transmission over up to 40 km of single-mode fiber.<\/p>\n<\/blockquote>\n\n\n\n

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How SFP+ 40km Relates to 10GBASE-ER<\/h3>\n\n\n\n