1000BASE-SX SFP Compatible Transceiver: 1.25G-SFP-550D

The EDGEOPTIC 1.25G-SFP-550D is a multi-vendor compatible 1000BASE-SX SFP dual-fiber optical module built for Gigabit Ethernet over multimode fiber. It transmits and receives at 850nm and runs at data rates from 1.063 to 1.25 Gbps, covering Gigabit Ethernet and 1G Fibre Channel short-wave. Transmission uses a VCSEL (Vertical-Cavity Surface-Emitting Laser) paired with a PIN photodiode receiver for short-reach enterprise and data center links.

The module holds a 7.5 dB optical link budget, derived from a -9.5 dBm minimum transmit power and -17 dBm receiver sensitivity. Maximum reach depends on the multimode fiber grade: 275 m over 62.5/125um OM1 (200 MHz-km) and the full 550 m over 50/125um OM2 (500 MHz-km) or better. Distance figures are calculated from the minimum optical budget and industry-standard fiber attenuation values, so actual reach varies with fiber quality and installation conditions.

The 1.25G-SFP-550D uses a hot-pluggable SFP form factor with duplex LC/UPC connectors. The electrical interface conforms to the INF-8074i MSA, ensuring compatibility with standard SFP host systems, and the module can be encoded for a wide range of vendor platforms. DDM/DOM (Digital Diagnostic Monitoring) reports transmitted and received optical power, module temperature, laser bias current, and supply voltage in real time. This diagnostic data is available through the MSA-compatible EEPROM interface for proactive monitoring and maintenance.

The module operates across a standard 0 to 70°C range in controlled data center and enterprise environments. It draws power from a single +3.3V supply, within SFP MSA limits for Class 1 power dissipation. Standards compliance covers IEEE 802.3z for Gigabit Ethernet and FC-PI for 1G Fibre Channel short-wave. Multi-vendor interoperability comes from strict adherence to MSA standards, though hosts that use vendor-specific module authentication may require custom EEPROM programming. The transceiver carries CE/RoHS certification and meets Class 1 FDA and IEC60825-1 laser safety standards. Common deployments include enterprise campus networks, data center rack-to-rack links, and storage area networks (1G Fibre Channel).

Backed by 15+ years of EdgeOptic compatibility engineering across vendor optical platforms. The 1.25G-SFP-550D ships next business day from EU stock with a lifetime warranty.