1.25G Dual-Port BiDi cSFP 40km Industrial TX1310/RX1490: 1.25G-cSFP-41-ADI

Our EDGEOPTIC 1.25G-cSFP-41-ADI is a multi-vendor compatible industrial-grade dual-port compact SFP optical module engineered for extended-reach Gigabit Ethernet deployments in harsh environmental conditions using the 1310/1490nm wavelength scheme. This cSFP transceiver integrates two independent BiDi (Bidirectional) channels within a single standard SFP footprint, delivering the unique combination of 40km reach, doubled port density, wavelength flexibility, and industrial temperature resilience.

The 1.25G-cSFP-41-ADI operates with both channels transmitting at 1310nm wavelength and receiving at 1490nm, 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-41-BDI (TX1490/RX1310), to establish proper bidirectional links. The 1310/1490nm wavelength combination enables compatibility with network architectures incorporating PON coexistence requirements or specific wavelength planning strategies in industrial environments.

The extended operating temperature range of -45 to +85°C combined with 40km transmission distance addresses the most demanding deployment scenarios where both environmental exposure and geographic distribution present challenges. Regional utility networks spanning remote substations, extensive transportation corridor communications, and industrial campus connectivity across harsh outdoor environments all benefit from this comprehensive specification set.

The transceiver employs DFB (Distributed Feedback) laser transmitters combined with PIN photodiode receivers for each channel, with all components selected and validated for consistent operation across the entire industrial temperature range. DFB technology provides the wavelength stability and narrow spectral characteristics essential for reliable extended-reach 1310nm transmission 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. The receiver operates within a focused 20nm bandwidth window (1480-1500nm), optimized for 1490nm wavelength reception. Actual achievable distance depends on fiber plant conditions, connector quality, and accumulated splice losses.

The 1.25G-cSFP-41-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 spanning remote locations, temperature monitoring combined with optical power trending enables predictive maintenance and validates environmental conditions across distributed infrastructure.

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 smart grid communications across distributed substations, railway and highway infrastructure networks, mining and resource extraction facilities, and any industrial installation requiring 40km reach with the 1310/1490nm wavelength plan and proven environmental resilience.

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.