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The Difference Between SFP-10G-SR and SFP-10G-LR

What is SFP-10G-SR?

SFP-10G-SR (Short Range) is a type of SFP+ transceiver designed for short-distance data transmission over multi-mode fiber (MMF). The "SR" denotes its suitability for short-range communication, typically within a range of up to 300 meters on OM3 multi-mode fiber and up to 400 meters on OM4 multi-mode fiber. SFP-10G-SR transceivers operate at a wavelength of 850 nm, utilizing Vertical-Cavity Surface-Emitting Laser (VCSEL) technology.

Key Characteristics of SFP-10G-SR:

Wavelength: 850 nm

Fiber Type: Multi-mode fiber (MMF)

Transmission Distance: Up to 300 meters (OM3) and up to 400 meters (OM4)

Connector Type: Usually LC duplex

Applications: Ideal for data centers, LANs, and high-performance computing networks where short-distance connections are predominant.

What is SFP-10G-LR?

SFP-10G-LR (Long Range) is a type of SFP+ transceiver designed for long-distance data transmission over single-mode fiber (SMF). The "LR" signifies its capability for long-range communication, with a typical reach of up to 10 kilometers on standard single-mode fiber. SFP-10G-LR transceivers operate at a wavelength of 1310 nm, utilizing distributed feedback (DFB) lasers.

Key Characteristics of SFP-10G-LR:

Wavelength: 1310 nm

Fiber Type: Single-mode fiber (SMF)

Transmission Distance: Up to 10 kilometers

Connector Type: Usually LC duplex

Applications: Suitable for metropolitan area networks (MANs), long-distance communication within cities, and connecting data centers across significant distances.

Comparison of Technical Specifications

To better understand the differences between SFP-10G-SR and SFP-10G-LR, let's compare their key technical specifications:





850 nm

1310 nm

Fiber Type

Multi-mode fiber (MMF)

Single-mode fiber (SMF)

Transmission Distance

Up to 300 meters (OM3)

Up to 400 meters (OM4)

Up to 10 kilometers

Laser Type


DFB Laser

Connector Type

LC duplex

LC duplex

Power Consumption

Generally lower

Generally higher




Performance Differences

1.Transmission Distance:

SFP-10G-SR: Optimized for short distances, making it ideal for environments where devices are within a few hundred meters of each other. It is commonly used within data centers to connect servers, switches, and storage devices.

SFP-10G-LR: Designed for long-distance communication, capable of transmitting data up to 10 kilometers. This makes it suitable for connecting different buildings within a campus or for use in metropolitan area networks.

2. Fiber Type:

SFP-10G-SR: Uses multi-mode fiber, which is less expensive and easier to install but limited in transmission distance and bandwidth.

SFP-10G-LR: Uses single-mode fiber, which supports longer distances and higher bandwidth but is more expensive and requires more precise alignment during installation.

3. Cost:

SFP-10G-SR: Typically less expensive due to the use of multi-mode fiber and VCSEL technology, which are cheaper to produce.

SFP-10G-LR: More expensive due to the use of single-mode fiber and DFB lasers, which are costlier but provide superior performance over longer distances.

4. Power Consumption:

SFP-10G-SR: Generally consumes less power, making it more efficient for densely populated data center environments.

SFP-10G-LR: Consumes more power, which can be a consideration in environments where power efficiency is critical.

Choosing SFP-10G-SR or SFP-10G-LR Based on Specific Application Requirements and Network Environment

The decision to use SFP-10G-SR or SFP-10G-LR should be based on a thorough analysis of your network’s specific needs and the environment in which it will operate. Here are some guidelines to help you choose the right transceiver:

1. Consider the Distance:

If your network connections are within a single building or a confined area, SFP-10G-SR is the appropriate choice. Its cost-effectiveness and ease of installation make it ideal for short-range applications.

For connections that span multiple buildings, across campuses, or within metropolitan areas, SFP-10G-LR is necessary. Its ability to handle long distances without significant signal loss ensures reliable communication over extended ranges.

2. Assess the Network Environment:

Data Centers: SFP-10G-SR is often preferred in data centers due to its lower cost and power consumption. The typical distance requirements within data centers align well with the capabilities of multi-mode fiber.

Campus and Metro Networks: SFP-10G-LR is suited for campus networks and metropolitan area networks where long-distance links are required. Its compatibility with single-mode fiber allows for fewer repeaters and amplifiers, reducing overall infrastructure costs.

3. Evaluate Budget Constraints:

For organizations with tight budgets, SFP-10G-SR offers a more economical solution for high-speed connections, as multi-mode fiber and VCSEL technology are cheaper.

While more expensive, SFP-10G-LR provides better performance for long-distance applications, justifying the investment for networks where long-haul connectivity is crucial.

4. Power Efficiency:

In environments where power efficiency is a priority, such as green data centers, the lower power consumption of SFP-10G-SR modules can be a significant advantage.

If power consumption is less of a concern and the focus is on distance and performance, SFP-10G-LR modules are the better choice.


Understanding the differences between SFP-10G-SR and SFP-10G-LR transceivers is essential for designing efficient and cost-effective fiber optic networks. SFP-10G-SR modules are ideal for short-distance applications within data centers and LANs, offering a cost-effective and power-efficient solution. On the other hand, SFP-10G-LR modules excel in long-distance communication, suitable for metropolitan and campus networks.

By carefully considering factors such as transmission distance, network environment, budget constraints, and power efficiency, network designers can make informed decisions on which type of SFP+ transceiver to deploy. This ensures that the network not only meets current demands but is also scalable and robust enough to accommodate future growth and technological advancements.


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