1.25G Dual-Port BiDi cSFP 20km Industrial TX1550/RX1310: 1.25G-cSFP-20-BDI

Our EDGEOPTIC 1.25G-cSFP-20-BDI is a multi-vendor compatible industrial-grade dual-port compact SFP optical module designed for reliable operation in extreme environmental conditions. This cSFP transceiver houses two independent BiDi (Bidirectional) channels within a single standard SFP form factor, enabling network engineers to maximize port density in outdoor and industrial Gigabit Ethernet installations.

The 1.25G-cSFP-20-BDI operates with both channels transmitting at 1550nm wavelength and receiving at 1310nm, supporting data rates from 1.063 to 1.25 Gbps per channel. Each channel utilizes BiDi technology through WDM (Wavelength Division Multiplexing) for full-duplex communication over a single fiber strand per port. This module serves as the complementary pair to the 1.25G-cSFP-20-ADI (TX1310/RX1550), and both units are required to establish functional bidirectional optical links.

The industrial temperature rating of -45 to +85°C distinguishes this transceiver from commercial variants, enabling deployment in environments with significant thermal stress. Whether installed in unheated outdoor cabinets experiencing winter extremes or in industrial enclosures subject to heat accumulation from adjacent equipment, this module maintains specified optical performance throughout its operational temperature range.

The transceiver utilizes DFB (Distributed Feedback) laser transmitters combined with PIN photodiode receivers for each channel. DFB laser technology provides superior wavelength stability across temperature variations, which is essential for maintaining reliable BiDi operation in fluctuating thermal conditions. With transmit power ranging from -9 to +3 dBm and receiver sensitivity of -23 dBm, the module delivers a guaranteed 14 dB optical link budget. This enables transmission distances up to 20 kilometers over standard single-mode fiber, suitable for extended reach industrial and outdoor network segments. Actual transmission distance is influenced by fiber plant quality, connector losses, and splice attenuation.

The 1.25G-cSFP-20-BDI features a Double LC/UPC connector interface accommodating two independent optical ports in the compact housing. The electrical interface adheres to CSFP MSA Option 2 specifications, ensuring seamless integration with industrial networking platforms from various equipment manufacturers.

Full Digital Diagnostic Monitoring (DDM/DOM) functionality enables real-time monitoring of transmitted and received optical power for both channels, module temperature, laser bias current, and supply voltage. In industrial applications, continuous temperature monitoring proves invaluable for predictive maintenance and ensuring transceivers operate within safe thermal boundaries.

Standards compliance encompasses IEEE 802.3z for Gigabit Ethernet, IEEE 802.3ah for 1000Base-BX20, and 1G Fiber Channel at 1.0625 Gbps. The module holds CE and RoHS certifications with Class 1 laser safety compliance per FDA and IEC 60825-1 requirements.

Typical applications include smart grid communications, transportation network infrastructure, outdoor distributed antenna systems, industrial process control networks, and remote site connectivity where environmental conditions exceed commercial equipment specifications. The dual-channel architecture combined with industrial-grade construction delivers both density and reliability in challenging deployments.

Because our focus is providing top quality service, we conduct thorough quality verification including temperature stress testing, dual-channel optical parameter measurements, connector cleanliness inspection, and EEPROM memory validation before delivery.