Product Overview
The QSFP 40G LR4 is a high-performance optical transceiver module designed for long-reach 40 Gigabit Ethernet applications over single mode fiber. It operates using four 10 Gbps wavelengths multiplexed over a single fiber strand in the 1310 nm range, supporting distances up to 10 kilometers. Compliant with IEEE 802.3ba 40GBASE-LR4 and equipped with an LC duplex interface, the QSFP 40G LR4 is ideal for enterprise backbone, telecom networks, and data center interconnects.
Product Details
| Attribute | Description |
| Product Name | QSFP 40G LR4 |
| Form Factor | QSFP+ |
| Data Rate | 40 Gbps (4 x 10 Gbps) |
| Wavelength | 4 x 1270–1330 nm CWDM |
| Interface Type | LC duplex connector |
| Fiber Type | Single Mode Fiber (SMF) |
| Max Distance | Up to 10 kilometers |
| Operating Temperature | 0C to 70C |
| Digital Diagnostics | Yes |
| Compatibility | IEEE 802.3ba 40GBASE-LR4 |
| Application | Long-reach Ethernet, campus backbone, telecom links |
Key Features
Supports 40G Ethernet over single mode fiber
4-channel CWDM multiplexed signal (1270–1330 nm)
Transmission distance up to 10 km
Standard LC duplex optical interface
Hot pluggable QSFP+ form factor
Digital diagnostics monitoring (DDM)
Ideal for high-speed, long-distance links
Low power consumption and high reliability
Technical Specifications
| Specification | Value |
| Form Factor | QSFP+ |
| Data Rate | 40 Gbps |
| Transmission Distance | 10 km |
| Wavelength | 1270 nm to 1330 nm (CWDM) |
| Connector Type | LC duplex |
| Fiber Type | Single Mode Fiber (SMF) |
| Transmit Power Range | –2.7 dBm to +4.5 dBm |
| Receive Sensitivity | –11.5 dBm |
| Operating Temperature | 0C to 70C |
| Voltage Supply | 3.3V |
Similar Models Comparison
| Model Name | Data Rate | Wavelength | Fiber Type | Max Distance | Interface |
| QSFP 40G LR4 | 40 Gbps | 1270–1330 nm | SMF | 10 km | LC |
| QSFP 40G SR4 | 40 Gbps | 850 nm | MMF | 150 m | MPO |
| QSFP 40G iSR4 | 40 Gbps | 850 nm | MMF | 150 m | MPO |
| QSFP 40G ER4 | 40 Gbps | 1270–1330 nm | SMF | 40 km | LC |
| QSFP 40G PSM4 | 40 Gbps | 1310 nm | SMF | 500 m | MPO |
