1G CWDM SFP 40km Transceiver: CWDM-1.25G-SFP-40

Our EDGEOPTIC CWDM-1.25G-SFP-40 is a multi-vendor compatible 1G CWDM SFP optical module designed for wavelength division multiplexing applications operating over single-mode fiber infrastructure. This CWDM transceiver enables high-density bandwidth scaling by allowing multiple wavelength channels to operate simultaneously over a single fiber pair, making it an essential building block for metropolitan networks, carrier access systems, and enterprise deployments requiring efficient spectral utilization without the complexity of DWDM solutions.

The CWDM-1.25G-SFP-40 module is available across 18 CWDM wavelength channels spanning 1270nm to 1610nm according to ITU-T G.694.2 grid specifications, with 20nm channel spacing. Each module supports data rates from 1.063 to 1.25 Gbps, enabling Gigabit Ethernet and 1G Fiber Channel applications. When combined with passive CWDM multiplexers, operators can aggregate up to 18 independent wavelength channels over a single fiber pair, dramatically increasing link capacity without deploying additional fiber infrastructure. Our 1G CWDM SFP transceiver utilizes DFB (Distributed Feedback) laser technology for transmission, providing the precise wavelength stability essential for reliable CWDM operation, paired with PIN photodiode for signal reception. The module ensures a 19 dB guaranteed optical link budget, supporting transmission distances up to 40 kilometers over standard single-mode fiber. However, distance remains an indicative parameter calculated for ease of identification – actual reach depends on minimal optical budget requirements, CWDM multiplexer insertion losses, and real-world attenuation characteristics of the installed fiber plant.

The CWDM-1.25G-SFP-40 is a hot-pluggable SFP module featuring duplex LC/UPC connectors as the optical interface. The electrical interface conforms to INF-8074i and SFP MSA (Multi-Source Agreement) specifications, ensuring compatibility with standard SFP host systems across multiple vendor equipment platforms. Our 1G CWDM SFP transceiver can be encoded for compatibility with 80+ equipment brands, enabling seamless integration into existing network infrastructure. The module incorporates DDM/DOM (Digital Diagnostic Monitoring) functionality, providing real-time operational parameters including transmitted and received optical power levels, module temperature, laser bias current, and supply voltage. This diagnostic data is accessible via MSA-compatible EEPROM interface, enabling comprehensive monitoring of transceiver health and performance – particularly valuable in multi-wavelength environments where per-channel diagnostics facilitate rapid troubleshooting.

The SFP form factor, while considered a legacy standard, remains widely deployed across enterprise, carrier, and industrial networks due to its proven reliability, broad equipment support, and cost-effectiveness for Gigabit applications. The module operates within a standard 0°C to 70°C commercial temperature range, with appropriate thermal considerations for sustained operation in controlled equipment room environments. Power requirements are met by a single +3.3V supply.

Standards compliance includes Gigabit Ethernet along with 1G Fiber Channel support at 1.0625 Gbps, and ITU-T G.694.2 CWDM wavelength grid conformance. The transceiver achieves multi-vendor interoperability through adherence to industry MSA standards, though equipment with vendor-specific module validation may require custom EEPROM programming for full compatibility. Our 1G CWDM SFP transceiver is CE and RoHS certified, meeting Class 1 FDA and IEC60825-1 laser safety requirements.

Typical applications include metropolitan area network wavelength overlays, carrier access aggregation, enterprise campus backbone expansion, and any deployment requiring cost-effective bandwidth scaling over existing fiber infrastructure. Because our focus is providing top quality service, we perform rigorous quality checks before delivery. This includes optical parameter measurements, wavelength verification, connector cleanliness inspection, and SFP transceiver EEPROM memory data validation tests.