40G QSFP+ LR4 10km Duplex LC/UPC 1271~1331nm Optical Transceiver Module
The 40G QSFP+ LR4 SMF optical transceiver delivers industry-leading performance for high-speed, long-reach data center and campus interconnects. Engineered to support 40GBASE-LR4 links over single-mode fiber up to 10 km, this QSFP+ module integrates Digital Diagnostic Monitoring (DDM) and is fully compliant with QSFP+ MSA and IEEE 802.3ba standards.In addition, the modules are hot-swappable, support an operating temperature range of 0°C to 70°C, and are RoHS6 compliant.
| Part Number | GL40-SM31LR10C | Tx Power (dBm) | -4~2.4 |
| Product | 40G QSFP+ LR4 | Sensitivity (dbm) | ≤-14.4 |
| Max Data Rate | 40Gbps | Distance | 10km |
| Wavelength | 1271~1331nm | Connector | Duplex LC/UPC |
| Laser Type (TX/RX) | DFB/PIN | Temp | 0~70 ℃ |
Data center server-to-switch uplinks
Spine-leaf and leaf-spine architectures
High-performance computing (HPC) clusters
Metro-area network (MAN) interconnects
Storage area network (SAN) links
- Up to 11.2Gbps per channel bandwidth
- Up to10km transmission
- 4 CWDM lanes MUX/DEMUX design
- Duplex LC connector
- QSFP MSA compliant
- Single +3.3V power supply operating
- Built-in digital diagnostic functions
- Temperature range 0°C to 70°C
- RoHS Compliant
Compliance & Compatibility
Standards: IEEE 802.3ba (40GBASE-LR4), QSFP+ MSA, CWDM ITU-T G.694.2
Connector Type: Duplex LC
Supply Voltage: 3.3 V DC
OEM Compatibility: Validated across major platforms including Cisco, Arista, Juniper, Dell, HP, Brocade, and more.
FAQ About 40G QSFP+ LR4 Optical Transceiver
A 40GBASE-LR4 10 km single-mode fiber transceiver provides high-speed, long-reach connectivity ideal for inter-rack and inter-building links. With 4× CWDM lanes (1271–1331 nm) and integrated DDM, you get robust performance, simplified diagnostics, and reduced need for external amplifiers.
Yes. The Fibrecross 40G QSFP+ LR4 SMF transceiver is fully validated on Cisco Nexus and Catalyst platforms, ensuring “plug-and-play” interoperability. We also test against Arista, Juniper, Dell EMC, and HP switches for broad cross-vendor compatibility.
First, use your switch’s CLI or management GUI to view DDM parameters—optical power, temperature, and voltage. Compare readings against the datasheet’s normal operating ranges. Common fixes include verifying fiber cleanliness, checking LC-duplex connections, and ensuring ambient temperature stays within 0 °C to +70 °C. If alarms persist, contact Fibrecross support for advanced diagnostics.
Simply visit the Fibrecross product page for the 40G QSFP+ LR4 SMF module and click the “Datasheet PDF” link. The document provides detailed electrical, optical, and mechanical specifications, plus recommended operating conditions and compliance certifications.
You can purchase our Fibrecross 40G QSFP+ LR4 SMF optical transceiver (1271–1331 nm, 10 km, DDM) directly from our website . We offer volume discounts, rapid lead times, and full compatibility guarantees with major OEM switches and routers.
