1G DWDM SFP 120km Transceiver: DWDM-1.25G-SFP-120

Our EDGEOPTIC DWDM-1.25G-SFP-120 is a multi-vendor compatible 1G DWDM SFP optical module designed for ultra-long-reach high-density wavelength division multiplexing applications operating over single-mode fiber infrastructure. This DWDM transceiver enables maximum spectral efficiency by utilizing tightly spaced wavelength channels according to ITU-T G.694.1 grid specifications, making it an essential building block for carrier-class regional networks, long-haul data center interconnects, and enterprise deployments requiring the highest possible channel density over extended fiber infrastructure.

The DWDM-1.25G-SFP-120 module is available across 45 DWDM wavelength channels (ITU channels 17-61) within the C-band spectrum, utilizing 100GHz channel spacing for precise wavelength allocation. Each module supports data rates from 1.063 to 1.25 Gbps, enabling Gigabit Ethernet and 1G Fiber Channel applications. When combined with passive or active DWDM multiplexers, operators can aggregate up to 45 independent wavelength channels over a single fiber pair – more than double the capacity of CWDM systems – dramatically increasing link capacity for bandwidth-intensive applications across extended distances. Our 1G DWDM SFP transceiver utilizes temperature-stabilized DFB (Distributed Feedback) laser technology for transmission, providing the extremely precise wavelength stability required for reliable DWDM operation with 100GHz channel spacing. The receiver incorporates APD (Avalanche Photodiode) technology, delivering significantly enhanced sensitivity compared to standard PIN photodiodes – a critical requirement for achieving the optical performance necessary at 120km distances. The module ensures a 32 dB guaranteed optical link budget, supporting transmission distances up to 120 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, DWDM multiplexer insertion losses, and real-world attenuation characteristics of the installed fiber plant.

The DWDM-1.25G-SFP-120 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 DWDM 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 – essential for ultra-long-distance high-density DWDM environments where proactive maintenance prevents costly service disruptions.

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.694.1 DWDM 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 DWDM SFP transceiver is CE and RoHS certified, meeting Class 1 FDA and IEC60825-1 laser safety requirements.

Typical applications include carrier-class regional backbone networks, inter-city data center interconnects, financial services low-latency links, and any deployment requiring maximum channel density over ultra-long-reach fiber infrastructure. Because our focus is providing top quality service, we perform rigorous quality checks before delivery. This includes optical parameter measurements, precise wavelength verification, connector cleanliness inspection, and SFP transceiver EEPROM memory data validation tests.