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

Our EDGEOPTIC BIDI-25G-SFP28-40B is a multi-vendor compatible 25G BiDi SFP28 single-fiber optical module designed for long-haul 25 Gigabit Ethernet applications requiring fiber conservation. The BIDI-25G-SFP28-40B 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 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-SFP28-40A module.

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 metropolitan core networks, regional interconnects, and applications where both fiber optimization and long-haul reach are essential. 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 BiDi architecture with APD receiver technology maximizes fiber utilization while maintaining exceptional 40km reach, requiring proper pairing with the BIDI-25G-SFP28-40A module to establish bidirectional communication.

BIDI-25G-SFP28-40B compatible long-haul BiDi module is hot-pluggable SFP28 with single LC/UPC connector as an optical interface, reducing fiber infrastructure requirements by 50% while supporting metropolitan-scale distances. The electrical interface conforms to SFF-8431 and SFF-8432 MSA (Multi-Source Agreement) specifications, ensuring compatibility with standard SFP28 host systems supporting multiple vendor equipment platforms. Our 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 per SFF-8472 specifications, enabling continuous monitoring of both wavelength channels on extended single-fiber links.

The module operates within a 0 to 70°C temperature range with maximum power consumption of 1.5W, optimized for deployment in controlled environment data centers and telecom facilities. 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. The DML laser technology provides robust output power from 0 to 6 dBm at 1310nm with minimum extinction ratio of 3.5 dB, while the APD photodiode delivers exceptional receiver sensitivity of -19 dBm at 1270nm wavelength, crucial for maintaining signal integrity over 40km distances. The 20nm receiver wavelength bandwidth ensures proper signal reception while maintaining channel isolation between transmit and receive paths. The transceiver achieves multi-vendor interoperability through adherence to SFP28 MSA standards, though equipment with vendor-specific module validation may require custom EEPROM programming for compatibility.

Our 25G BiDi SFP28 40km transceiver is CE/RoHS certified and compliant with Class 1 FDA and IEC60825-1 laser safety standards. Typical applications include metro core deployments, 5G xHaul networks leveraging CPRI/eCPRI capabilities, regional backbone connections with fiber constraints, and service provider networks where fiber infrastructure costs are prohibitive. The combination of BiDi technology and APD receiver provides optimal performance for scenarios requiring both maximum fiber efficiency and exceptional reach. 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 rigorous quality checks before delivery including optical parameter measurements at both wavelengths, APD bias optimization tests, wavelength isolation testing, connector cleanliness tests, and SFP28 transceiver EEPROM memory data validation tests, ensuring reliable 40km bidirectional operation in matched transceiver pairs.