1.25G Dual-Port BiDi cSFP 40km Transceiver TX1490/RX1310: 1.25G-cSFP-41-BD

Our EDGEOPTIC 1.25G-cSFP-41-BD is a multi-vendor compatible dual-port compact SFP optical module engineered for extended-reach Gigabit Ethernet networks operating on 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 maximize port density while achieving 40km transmission capability with specific wavelength allocation flexibility.

The 1.25G-cSFP-41-BD 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-41-AD (TX1310/RX1490), with both units required to establish complete bidirectional optical links. The 1490/1310nm wavelength combination provides an alternative to the standard 1550/1310nm scheme, enabling compatibility with network designs incorporating PON wavelength planning or specific spectral allocation requirements.

The 40km reach capability addresses metropolitan and regional network architectures where extended transmission distance combined with wavelength flexibility is essential. Service provider access aggregation, carrier backbone interconnects, and enterprise WAN deployments benefit from this unique combination of distance, dual-channel density, and wavelength scheme compatibility. The extended reach is achieved through enhanced optical specifications, with transmit power ranging from -5 to 0 dBm and receiver sensitivity of -24 dBm, delivering a guaranteed 19 dB optical link budget.

The transceiver utilizes DFB (Distributed Feedback) laser transmitters combined with PIN photodiode receivers for each channel. DFB technology ensures excellent wavelength stability and narrow spectral characteristics essential for reliable 1490nm extended-reach transmission. With dispersion tolerance of 800-1000 ps/nm, the module accommodates the accumulated chromatic dispersion typical of 40km single-mode fiber spans. The receiver operates within a wide 100nm bandwidth window (1260-1360nm), ensuring robust 1310nm signal reception across varying source characteristics. As with all extended-reach deployments, actual achievable distance depends on fiber plant quality, connector losses, and cumulative splice attenuation.

The 1.25G-cSFP-41-BD features a Double LC/UPC connector interface accommodating two independent optical ports within the compact housing. The electrical interface adheres to CSFP MSA Option 2 specifications, ensuring seamless integration with compatible host equipment from multiple vendors 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. Comprehensive diagnostics enable efficient troubleshooting and proactive maintenance across extended network segments.

The module operates within standard commercial temperature range of 0 to 70°C, appropriate for controlled environments including central offices, telecommunications facilities, and data centers. Power is supplied via a single +3.3V rail.

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 metropolitan ring networks, extended campus interconnects, service provider aggregation, and installations where the 1490/1310nm wavelength plan facilitates network overlay designs or coexistence with existing PON infrastructure.

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