25G BiDi SFP28 40km Industrial Transceiver (Side B): BIDI-25G-SFP28-40BI

Our EDGEOPTIC BIDI-25G-SFP28-40BI is a multi-vendor compatible industrial-grade 25G BiDi SFP28 single-fiber optical module designed for long-haul 25 Gigabit Ethernet applications in harsh environmental conditions. The BIDI-25G-SFP28-40BI module transmits at 1310nm wavelength and receives at 1270nm wavelength, with data rates from 8.5 to 28.1 Gbps supporting multiple protocol standards and applications. Our industrial 25G BiDi SFP28 40km transceiver utilizes DML (Directly Modulated Laser) technology for transmission and APD (Avalanche Photodiode) for receiving, serving as the complementary unit for bidirectional communication when paired with the BIDI-25G-SFP28-40AI module in extreme temperature environments.

The transceiver ensures a 19 dB guaranteed optical link budget with host-based Forward Error Correction (FEC) support, which determines the maximum transmission distance capabilities. Over standard single-mode fiber (SMF), the module achieves reliable bidirectional transmission up to 40 kilometers, making it ideal for outdoor metropolitan deployments, industrial backbone networks, and critical infrastructure where both fiber optimization and long reach are essential in harsh conditions. However, distance is just an indicative parameter calculated for convenience of identification – eventually we calculate distance taking into account minimal optical budget and average attenuation of optical cabling in industry standards. The robust BiDi architecture with APD receiver technology maintains exceptional 40km reach across extreme temperature variations, requiring proper pairing with the BIDI-25G-SFP28-40AI module to establish bidirectional communication.

BIDI-25G-SFP28-40BI compatible industrial long-haul BiDi module is hot-pluggable SFP28 with single LC/UPC connector as an optical interface, reducing fiber infrastructure requirements by 50% while meeting stringent industrial reliability standards. The electrical interface conforms to SFF-8431, SFF-8432, and SFF-8472 MSA (Multi-Source Agreement) specifications, ensuring compatibility with standard SFP28 host systems supporting multiple vendor equipment platforms. Our industrial 25G BiDi SFP28 40km transceiver can be encoded to be compatible and successfully operate in different 80+ brands of equipment. The module incorporates comprehensive 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, enabling continuous monitoring of both wavelength channels across extended distances in extreme conditions.

The module operates within an extended industrial temperature range of -45°C to +85°C, with maximum power consumption of 1.5W, specifically designed for deployment in uncontrolled environments including outdoor cabinets, remote cell sites, utility infrastructure, and transportation networks. The enhanced thermal design ensures stable DML laser operation at 1310nm with output power from 0 to 6 dBm and maintains the 3.5 dB minimum extinction ratio across the entire temperature spectrum while preserving 40km reach capability. The APD photodiode receiver delivers enhanced sensitivity of -19 dBm at 1270nm even at temperature extremes, providing superior performance compared to PIN-based alternatives. The 20nm receiver wavelength bandwidth ensures proper channel isolation between transmit and receive paths. Standards compliance includes CPRI Option 10/eCPRI specifications for wireless fronthaul applications, supporting both 10G Ethernet (10.31 Gbps) and 25G Ethernet (25.78 Gbps) applications.

Our industrial 25G BiDi SFP28 40km transceiver is CE/RoHS certified and compliant with Class 1 FDA and IEC60825-1 laser safety standards. Typical applications include outdoor 5G xHaul deployments utilizing CPRI/eCPRI capabilities, smart grid backbone communications, railway signaling systems, mining operations, and oil and gas facilities where fiber scarcity, extended reach requirements, and harsh environmental conditions converge. The combination of BiDi technology, APD receiver, and industrial hardening makes it ideal for metropolitan-scale deployments in extreme conditions with limited fiber availability. The multi-rate capability accommodates legacy 10 Gigabit Ethernet operation alongside native 25 Gigabit rates, providing operational flexibility for mixed-speed network deployments. Because our focus is providing top quality service, we perform extensive environmental testing including thermal cycling, vibration resistance, humidity exposure tests, APD bias stability verification, wavelength isolation testing, in addition to optical parameter measurements, connector cleanliness tests, and SFP28 transceiver EEPROM memory data validation tests, ensuring reliable 40km bidirectional operation in matched pairs.