1.25G BiDi SFP 120km Transceiver (Side B): BIDI-1.25G-SFP-120-BD

Our EDGEOPTIC BIDI-1.25G-SFP-120-BD is a multi-vendor compatible 1.25G bidirectional SFP optical module designed for ultra-long-reach Gigabit Ethernet applications operating over single-mode fiber infrastructure. This BiDi transceiver enables cost-effective fiber utilization by transmitting and receiving on a single fiber strand, making it an exceptional solution for regional backbone deployments, long-haul carrier access, and scenarios where extreme reach combined with fiber conservation delivers substantial infrastructure cost savings.

The BIDI-1.25G-SFP-120-BD module operates at 1550nm wavelength for transmission and 1490nm for reception, supporting data rates from 1.063 to 1.25 Gbps. This Side B transceiver must be deployed in matched pairs with its complementary Side A unit (transmitting at 1490nm, receiving at 1550nm) to establish bidirectional communication over a single fiber strand. The 1550/1490nm wavelength combination is specifically engineered for ultra-long distance applications, operating within the lowest attenuation window of single-mode fiber. Our 1.25G BiDi SFP transceiver utilizes DFB (Distributed Feedback) laser technology for transmission, providing superior wavelength stability, narrow spectral width, and high output power essential for reliable extended-reach operation. The receiver incorporates APD (Avalanche Photodiode) technology, delivering significantly enhanced sensitivity compared to standard PIN photodiodes – a critical requirement for achieving the optical performance necessary at 120km distances. The module ensures a 31 dB guaranteed optical link budget, supporting transmission distances up to 120 kilometers over standard single-mode fiber. However, distance remains an indicative parameter calculated for ease of identification – actual reach depends on minimal optical budget requirements and real-world attenuation characteristics of the installed fiber plant.

The BIDI-1.25G-SFP-120-BD is a hot-pluggable SFP module featuring a single LC/UPC connector as the optical interface. The electrical interface conforms to INF-8074i and SFP MSA (Multi-Source Agreement) specifications, ensuring compatibility with standard SFP host systems across multiple vendor equipment platforms. Our 1.25G BiDi SFP transceiver can be encoded for compatibility with 80+ equipment brands, enabling seamless integration into existing network infrastructure. The module incorporates DDM/DOM (Digital Diagnostic Monitoring) functionality, providing real-time operational parameters including transmitted and received optical power levels, module temperature, laser bias current, and supply voltage. This diagnostic data is accessible via MSA-compatible EEPROM interface, enabling comprehensive monitoring of transceiver health and performance – essential for ultra-long-distance links where proactive maintenance prevents costly service disruptions.

The SFP form factor, while considered a legacy standard, remains widely deployed across enterprise, carrier, and industrial networks due to its proven reliability, broad equipment support, and cost-effectiveness for Gigabit applications. The module operates within a standard 0°C to 70°C commercial temperature range, with appropriate thermal considerations for sustained operation in controlled equipment room environments. Power requirements are met by a single +3.3V supply.

Standards compliance includes Gigabit Ethernet along with 1G Fiber Channel support 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 full compatibility. Our 1.25G BiDi SFP transceiver is CE and RoHS certified, meeting Class 1 FDA and IEC60825-1 laser safety requirements.

Typical applications include regional carrier backbone networks, inter-city connectivity, utility grid communication systems, oil and gas pipeline monitoring, and long-distance infrastructure requiring maximum reach over single-fiber paths. Because our focus is providing top quality service, we perform rigorous quality checks before delivery. This includes optical parameter measurements, connector cleanliness inspection, and SFP transceiver EEPROM memory data validation tests.