1.25G SFP 120km SMF Transceiver: 1.25G-SFP-120D

Our EDGEOPTIC 1.25G-SFP-120D is a multi-vendor compatible ultra-long-reach SFP dual-fiber optical module designed for Gigabit Ethernet applications operating over single-mode fiber cabling. The 1.25G-SFP-120D module operates at 1550nm wavelength for transmission and reception, with data rates from 1.063 to 1.25 Gbps and supports multiple protocol standards and applications. Our 1.25G SFP transceiver utilizes DFB (Distributed Feedback) laser for transmission and APD (Avalanche Photodiode) for receiving. Transceiver ensures a 32 dB guaranteed optical link budget, which determines the maximum transmission distance. Over single-mode fiber, the transceiver can reach distances up to 120 kilometers, providing ultra-long-reach connectivity for regional and backbone network deployments. However, distance is just an indicative parameter calculated for comfort of identification – eventually we calculate distance taking into account minimal optical budget and average attenuation of optical cabling in industry.

1.25G-SFP-120D compatible ultra-long-reach module is hot-pluggable SFP with duplex LC/UPC connectors as an optical interface. The electrical interface conforms to INF-8074i MSA (Multi-Source Agreement) specifications, ensuring compatibility with standard SFP host systems supporting multiple vendor equipment platforms. Our 1.25G SFP transceiver can be encoded to be compatible and successfully operate in different 80+ brands of equipment. The module incorporates DDM/DOM (Digital Diagnostic Monitoring) functionality providing real-time information including transmitted and received optical power levels, module temperature, bias current, and supply voltage. This diagnostic data is available via MSA-compatible EEPROM interface and enables monitoring of transceiver operational parameters. The module operates within a 0 to 70°C temperature range, with appropriate thermal considerations for sustained operation in controlled network environments.

Standards compliance includes IEEE 802.3z for Gigabit Ethernet, along with support for 1G Fiber Channel applications at 1.0625 Gbps. The transceiver achieves multi-vendor interoperability through adherence to industry MSA standards, though equipment with vendor-specific module validation may require custom EEPROM programming for compatibility. Our 1.25G SFP transceiver is CE/RoHS certified, and it is compliant with Class 1 FDA and IEC60825-1 laser safety standards.

Typical applications are regional backbone networks, service provider core infrastructure, inter-city connections, and submarine cable landing stations. The 120km reach capability represents near-maximum distance achievable in standard SFP form factor, with APD receiver technology providing exceptional -32 dBm sensitivity essential for ultra-long-haul transmission. The combination of high transmit power (0 to 5 dBm) and APD receiver creates robust link margins for reliable operation across extended distances. The DFB laser ensures superior wavelength stability critical for long-haul applications with high chromatic dispersion tolerance. The module's wavelength bandwidth of 37nm (1528-1565nm) maintains stable operation across environmental variations. Because our focus is providing top quality service, we are performing serious quality checks before delivery of our products. As a result, we do optical parameter measurements, connector cleanness tests and SFP transceiver EEPROM memory data validation tests.