OC-3 BiDi SFP 120km Transceiver (Side A): BIDI-155M-SFP-120-AD

Our EDGEOPTIC BIDI-155M-SFP-120-AD is a multi-vendor compatible OC-3/STM-1 bidirectional SFP optical module designed for ultra-long-reach Fast Ethernet and SDH/SONET 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 while supporting established 100M and 155M protocol standards.

The BIDI-155M-SFP-120-AD module operates at 1490nm wavelength for transmission and 1550nm for reception, supporting data rates from 100 to 155 Mbps. This Side A transceiver must be deployed in matched pairs with its complementary Side B unit (transmitting at 1550nm, receiving at 1490nm) to establish bidirectional communication over a single fiber strand. The 1490/1550nm wavelength combination is specifically engineered for ultra-long distance applications, operating within the lowest attenuation window of single-mode fiber. Our OC-3 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, paired with PIN photodiode for signal reception. The lower data rate requirements at 155 Mbps enable achieving exceptional receiver sensitivity with PIN technology, eliminating the need for more complex APD receivers. The module ensures a 34 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-155M-SFP-120-AD 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 OC-3 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 sub-Gigabit applications. The OC-3/STM-1 data rate continues to serve critical roles in telecommunications infrastructure, particularly in SDH/SONET transport networks, utility grid communication systems, and legacy carrier backbone applications where higher bandwidth is not required but maximum reach is essential. 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 IEEE 802.3ah for 100BASE-BX Fast Ethernet along with SDH/SONET OC-3/STM-1 (155Mbps) support. 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 OC-3 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.