1.25G Dual-Port BiDi cSFP 20km Industrial TX1490/RX1310: 1.25G-cSFP-21-BDI

Our EDGEOPTIC 1.25G-cSFP-21-BDI is a multi-vendor compatible industrial-grade dual-port compact SFP optical module designed for reliable Gigabit Ethernet operation in extreme environmental conditions using the 1490/1310nm wavelength scheme. This cSFP transceiver houses two independent BiDi (Bidirectional) channels within a single standard SFP form factor, enabling network engineers to achieve maximum port density in outdoor and industrial installations.

The 1.25G-cSFP-21-BDI operates with both channels transmitting at 1490nm wavelength and receiving at 1310nm, supporting data rates from 1.063 to 1.25 Gbps per channel. Each channel employs BiDi technology through WDM (Wavelength Division Multiplexing) to deliver full-duplex communication over a single fiber strand per port. This module functions as the complementary pair to the 1.25G-cSFP-21-ADI (TX1310/RX1490), with both units required to establish complete bidirectional optical links. The 1490/1310nm wavelength combination provides compatibility with network designs incorporating PON wavelength planning or specific spectral allocation requirements.

The extended operating temperature range of -45 to +85°C distinguishes this industrial variant from commercial transceivers, enabling deployment in thermally challenging environments. Whether installed in unheated outdoor cabinets during harsh winters or enclosed industrial spaces with elevated ambient temperatures, this module maintains specified optical performance across the entire temperature envelope.

The transceiver utilizes DFB (Distributed Feedback) laser transmitters combined with PIN photodiode receivers for each channel. DFB laser technology delivers superior wavelength stability across wide temperature variations, critical for maintaining reliable 1490nm BiDi operation in fluctuating industrial conditions. With transmit power ranging from -9 to +3 dBm and receiver sensitivity of -23 dBm, the module provides a guaranteed 14 dB optical link budget supporting transmission distances up to 20 kilometers over standard single-mode fiber. The receiver accommodates a wide 100nm bandwidth window (1260-1360nm), ensuring robust 1310nm signal reception. Actual achievable distance depends on fiber plant quality, connector losses, and splice attenuation in each specific installation.

The 1.25G-cSFP-21-BDI features a Double LC/UPC connector interface with two independent optical ports integrated into the compact housing. The electrical interface adheres to CSFP MSA Option 2 specifications, ensuring compatibility with industrial networking platforms from various equipment manufacturers supporting this form factor.

Full Digital Diagnostic Monitoring (DDM/DOM) functionality provides real-time access to operational parameters including transmitted and received optical power for both channels, module temperature, laser bias current, and supply voltage. Continuous temperature monitoring proves essential in industrial deployments for predictive maintenance and validating operation within thermal specifications.

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 utility grid communications, intelligent transportation systems, railway trackside networks, industrial automation connectivity, and remote infrastructure where the 1490/1310nm wavelength plan combined with industrial temperature resilience is required.

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