Choosing the Right 40G QSFP+ Transceiver: Maximize Network Performance
Updated at Jan 15th 20251 min read
In today's fast digital world, businesses are always looking for ways to improve their network performance. They need to meet the growing demands for faster data transmission and reliable service. One crucial component in achieving this goal is the 40G QSFP+ transceiver.
Choosing the right 40G QSFP+ transceiver is critical to optimising network performance. In this article, we’ll explore what 40G modules are, their benefits, key factors to consider when choosing one.
What Is a 40G QSFP+ Transceiver?
The 40G QSFP+ transceiver is a powerful networking tool. It is made for quick data transfer in data centers and high-performance computing areas. It uses a compact QSFP+ package with four transmit and four receive channels, achieving data transfer rates of up to 40 Gbps.
Key advantages of the 40G QSFP+ transceiver include:
High Density: The compact QSFP+ packaging design enables higher port density within limited rack space, maximizing network capacity.
Low Power Consumption: While providing high-speed transmission, it has low power consumption, helping to reduce corporate energy usage and operational costs.
Hot-Swappable Functionality: Supports hot swapping, allowing modules to be replaced and maintained without interrupting network services, enhancing network flexibility.
Wide Compatibility: Supports multiple interface standards, such as 40GBASE-SR4, LR4, ER4, etc., providing flexible network configuration options and simplifying network management.
Key Tips on Choosing 40G QSFP+ Transceiver
When choosing a 40G QSFP+ optical module, you should think about several factors. This will help ensure the network is efficient, reliable, and sustainable.
Transmission Distance
Transmission distance is a critical consideration when selecting a 40G QSFP+ transceiver. Depending on your network structure, you may need a module capable of efficiently transmitting data over short or long distances.
For short-range applications, the 40G SR4 module is suitable, reaching up to 150 meters over OM4 MMF (or 100 meters over OM3). For long distances, the 40G LR4 module can achieve 40G Ethernet throughput up to 10 kilometers. If you require even greater distances, the 40G ER4 module supports up to 40 kilometers over single-mode fiber.
Like other transceivers, 40G QSFP+ modules come in various transmission ranges, such as 100m, 150m, 300m, 1km, and 2km. Choose the appropriate QSFP+ model based on your network's distance requirements.
Wavelength
When selecting a 40G QSFP+ transceiver, wavelength is a crucial factor that directly impacts signal transmission distance and fiber compatibility.
Two common wavelengths are 850nm and 1310nm. Use 850nm with multimode fiber for short hops, like linking devices in a data center. For longer runs, 1310nm with single-mode fiber is the pick, good for connecting data centers and spanning metro networks, reaching 10 kilometers or beyond.
Choosing the right wavelength ensures the best compatibility between the transceiver and the optical fiber. This enables efficient and reliable data transmission to meet the needs of different network environments.
Interface Type
When selecting a 40G QSFP+ transceiver, it's also important to consider the type of connector used by the module. The two commonly used connector types are MTP/MPO and duplex LC.
MTP/MPO: Often used for multimode fiber transmission. It enables efficient data transfer over short distances by parallelizing multiple fiber channels, making it ideal for high-density interconnections within data centers.
Duplex LC: Widely used for single-mode fiber transmission. It separates transmit and receive signals with two LC connectors. This setup is good for long-distance transmission where signal accuracy matters.
If you are concerned about high-density applications and need short distance connections, MTP/MPO connectors are a better choice. And for long distance transmission and higher flexibility, LC connectors are a good choice.
Compatibility and Future Upgrades
Choose QSFP+ transceiver that comply with international standards such as IEEE and MSA to ensure compatibility with various devices. This can effectively prevent connection issues and limited transmission speeds, thereby ensuring the stable operation of the network.

At the same time, it is wise to choose transceivers that can be upgraded in the future. Many 40G QSFP+ transceivers are designed to be compatible with both lower-speed connections and higher-speed standards. For example, 40G QSFP+ transceivers can support 10G connections over breakout cables. This not only provides greater flexibility, but also leaves plenty of room for future network upgrades.
FS 40G QSFP+ Transceiver
The Introduction of FS 40G QSFP+ Transceiver
As a global leading provider of network solutions, FS offers a wide range of 40G QSFP+ transceivers to meet various network demands. FS modules are known for their exceptional quality, rigorous testing, and industry-leading compatibility. Below is an overview of the FS 40G QSFP+ transceiver series:
Model | Cable Type | Wavelength | Connector | Max Cable Distance | Power Consumption |
MMF | 850nm | MTP/MPO-12 Male | 150m@OM4 100m@OM3 | <1.5W | |
MMF/SMF | 1310nm | Duplex LC | 150m@OM3 2km@SMF | ≤3.5W | |
MMF | 850/880/910/940nm | Duplex LC | 300m@OM3 400m@OM4 500m@OM5 | ≤3.5W | |
MMF | 850nm | MTP/MPO-12 Male | 400m@OM4 | ≤1.2W | |
SMF | 1310nm | Duplex LC | 2km | ≤3.5W | |
SMF | 1310nm | MTP/MPO-12 Male | 2km | ≤2.5W | |
SMF | 1310nm | MTP/MPO-12 Male | 10km | ≤2.5W | |
SMF | 1310nm | Duplex LC | 10km | ≤3.5W | |
SMF | 1310nm | Duplex LC | 20km | ≤3.5W | |
SMF | 1310nm | Duplex LC | 40km | ≤3.5W | |
SMF | 1310nm | Duplex LC | 80km | ≤4.5W |
Why Choose FS 40G QSFP+ Transceiver?
When it comes to network infrastructure, choosing the right transceiver is crucial for ensuring reliable and high-speed data transmission. FS 40G QSFP+ transceivers stand out in the market due to several compelling reasons. Let's explore these advantages from various important perspectives:
Professional Team and Customized Services
FS has more than 1,000 professional engineers with in-depth industry knowledge and technical expertise. Whether you need guidance in selecting the right optical transceivers or help with network design, the FS team can provide tailored solutions.
Global Presence and Rapid Response
FS operates globally with seven local warehouses, covering more than 200 countries and regions, enabling fast response to regional customer demands and ensuring a stable product supply. Partnerships with leading logistics providers such as DHL, FedEx and UPS result in more efficient and accurate deliveries.
Diverse Products and Wide Compatibility
FS offers a wide range of 40G QSFP+ transceiver, including SR4, LR4, and ER4, to suit various network connection requirements for different scales and scenarios. Whether for data centers, enterprise networks, or inter-region fiber connections, FS provides the right solution to meet your needs. Furthermore, FS keeps its product line updated with industry standards and technology advancements, offering transceivers that meet current market demands and future-proof your infrastructure.
Rigorous Testing and Quality Assurance
FS has a well-equipped laboratory and a stable reliability testing platform, offering professional reliability test reports. Each FS 40G QSFP+ transceiver undergoes comprehensive compatibility and performance testing to ensure seamless integration with leading network brands such as Cisco, Juniper, and Arista. To learn more about our quality testing program and gain deeper insight and confidence, please visit the relevant page.

Conclusion
Choosing the right 40G QSFP+ transceiver maximizes network performance. By considering factors such as transmission distance and interface type, you can make an informed decision based on your needs.
FS 40G QSFP+ transceiver stands out for their exceptional quality, extensive compatibility, and customer-centric service. Whether you are upgrading your network or planning a new one, FS provides reliable solutions. These solutions help you achieve the best performance for the future. Explore FS 40G QSFP+ transceiver series now and experience dual improvement in performance and reliability!