1.25G Dual-Port BiDi cSFP 40km Industrial TX1310/RX1550: 1.25G-cSFP-40-ADI

Our EDGEOPTIC 1.25G-cSFP-40-ADI is a multi-vendor compatible industrial-grade dual-port compact SFP optical module engineered for extended-reach Gigabit Ethernet deployments in demanding environmental conditions. This cSFP transceiver integrates two independent BiDi (Bidirectional) channels within a single standard SFP footprint, delivering both doubled port density and 40km reach capability for networks operating in harsh outdoor and industrial environments.

The 1.25G-cSFP-40-ADI operates with both channels transmitting at 1310nm wavelength and receiving at 1550nm, supporting data rates from 1.063 to 1.25 Gbps per channel. Each channel employs BiDi technology with WDM (Wavelength Division Multiplexing) to achieve full-duplex communication over individual fiber strands. This module must be paired with its complementary counterpart, the 1.25G-cSFP-40-BDI (TX1550/RX1310), to establish proper bidirectional links.

The combination of extended 40km reach and industrial temperature rating of -45 to +85°C addresses the most challenging deployment scenarios. Metropolitan utility networks spanning substations across wide geographic areas, transportation corridor communications linking remote trackside equipment, and oil and gas infrastructure connecting distributed facilities all benefit from this unique combination of distance and environmental resilience. Where commercial-grade 40km modules would fail in uncontrolled thermal environments, this industrial variant maintains full optical performance.

The transceiver employs DFB (Distributed Feedback) laser transmitters combined with PIN photodiode receivers for each channel, with all components selected and qualified for consistent operation across the entire industrial temperature range. DFB technology provides the narrow spectral width essential for extended-reach transmission while maintaining wavelength stability despite temperature fluctuations. With transmit power ranging from -5 to 0 dBm and receiver sensitivity of -24 dBm, the module delivers a guaranteed 19 dB optical link budget. Operating at 1310nm where chromatic dispersion is minimal, the module tolerates 300-400 ps/nm dispersion, appropriate for 40km single-mode fiber spans. Actual achievable distance depends on fiber plant conditions, connector quality, and accumulated splice losses.

The 1.25G-cSFP-40-ADI features a Double LC/UPC connector interface providing two separate optical ports within the compact enclosure. The electrical interface conforms to CSFP MSA Option 2 specifications, ensuring compatibility with industrial networking equipment from multiple vendors supporting this form factor.

Digital Diagnostic Monitoring (DDM/DOM) functionality provides comprehensive real-time visibility into operational parameters including transmitted and received optical power for both channels, module temperature, laser bias current, and supply voltage. In extended-reach industrial deployments, temperature monitoring combined with optical power trending enables predictive maintenance and validates environmental conditions remain within specification across remote installations.

Standards compliance includes IEEE 802.3z for Gigabit Ethernet, IEEE 802.3ah for 1000Base-BX applications, and 1G Fiber Channel at 1.0625 Gbps. Certifications encompass CE marking, RoHS compliance, and Class 1 laser safety per FDA and IEC 60825-1 standards.

Typical deployment scenarios include regional utility grid communications, railway signaling and communications networks spanning extended corridors, highway intelligent transportation systems, and industrial campus connectivity where both distance requirements and environmental exposure demand industrial-grade extended-reach optics.

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