40GBASE-LR4 QSFP+ Transceiver: 40G-QSFP-10

The 40GBASE-LR4 QSFP+ is a multi-vendor 40 Gigabit Ethernet transceiver for long-reach links over single-mode fiber. It uses four-channel CWDM at 1271 nm, 1291 nm, 1311 nm, and 1331 nm for both transmit and receive, with a supported data rate up to 44.8 Gbps across several network protocols. A DFB laser drives each transmit lane and a PIN photodiode handles reception, a combination suited to metropolitan and regional connectivity.

The module carries a 6.6 dB link budget, which sets the practical reach. Over standard single-mode fiber it covers up to 10 km, enough for campus backbones and metropolitan area networks. Per-lane transmit power runs from −6 dBm to +3 dBm, and receiver sensitivity is −12.6 dBm per lane with a +3 dBm overload point, so both ends keep margin on typical G.652 spans.

The hot-pluggable QSFP+ form factor terminates in duplex LC/UPC connectors, which keeps fiber management simpler than parallel-optics alternatives. The electrical interface conforms to the INF-8438i and SFF-8436 QSFP+ MSA specifications for compatibility with standard QSFP+ host ports. The transceiver can be encoded to operate in equipment from multiple vendor platforms, and hosts with proprietary module checks may require vendor-specific EEPROM coding.

DOM monitoring reports per-channel transmit and receive optical power, module temperature, laser bias current, and supply voltage through the MSA-compatible EEPROM interface, which supports proactive maintenance. The module operates across the 0 to 70 °C commercial temperature range on a single 3.3 V supply, holding consistent performance in controlled telecom and data center environments. It is CE and RoHS certified and meets Class 1 laser safety under FDA and IEC 60825-1.

Standards coverage starts with IEEE 802.3ba Clause 87 for 40 Gigabit Ethernet at 41.25 Gbps. The same module also carries OTU3 (43.01 Gbps) and OTU3e2 (44.58 Gbps) for Optical Transport Networks, plus STM-256 (39.81 Gbps) for SDH/SONET. That multirate envelope makes it a single part for transport and service provider aggregation as well as enterprise Ethernet, with the CWDM grid keeping the module compatible with standard single-mode fiber plant.

Typical deployments include data center interconnects, metropolitan area networks, enterprise campus backbones, and service provider aggregation. Backed by 15+ years of EdgeOptic compatibility engineering across vendor optical platforms, the module ships next business day from EU stock with a lifetime warranty. For coding to a specific host platform, contact our sales team.