SFP-10G-SR vs SFP-10G-LR: How to choose?

Optical fiber communication technology is crucial for efficient information transmission, significantly enhancing data transmission speeds. Optical modules, a vital component of this technology, play a key role. Among the parameters associated with optical modules, common ones include SFP-10G-SR and SFP-10G-LR. When making a purchase decision, it’s pivotal for you to understand the difference between SFP-10G-SR and SFP-10G-LR before choosing products.

What are the SFP-10G-SR and SFP-10G-LR

SFP refers to hot-pluggable small form factor modules. 10G represents its maximum transmission rate of 10.3 Gbps, which is suitable for 10 Gigabit Ethernet. SR and LR represent the transmission distance of the SFP 10g module.


SFP-10G-SR is designed for short-distance transmission, typically up to 300 meters over multimode fiber. Using 850 nm wavelength laser and LC bidirectional connector, it is easy to plug and install. The module supports hot-swappable function, which can be safely replaced while the device is running, with stable performance and reliability. In data center networks, SFP-10G-SR is often used for connections between servers to support high-speed data transmission. It is also suitable for enterprise network environments, especially in scenarios with high network performance requirements.


The SFP-10G-LR is specifically engineered for medium to long-distance transmissions, typically spanning 10 to 40 kilometers over single-mode fiber. Boasting a 1310nm wavelength laser and an LC bidirectional connector, it facilitates effortless and smooth installation. The compatibility of SFP-10G-LR with single-mode optical fiber makes it an ideal solution for fulfilling communication needs in medium to long-distance scenarios, including establishing connections between remote offices. Furthermore, it proves well-suited for constructing network backbones, enabling high-speed data transmission among diverse network devices.

Differences Between SFP-10G-SR and SFP-10G-LR

Transmission Distance: The primary distinction lies in their coverage range, with SFP-10G-SR for short distances and SFP-10G-LR for longer ones.

Fiber Compatibility: SFP-10G-SR works with multimode fiber, while SFP-10G-LR requires single-mode fiber.

Use Cases: SFP-10G-SR is optimal for intra-building connections, while SFP-10G-LR is suitable for inter-building or even metropolitan-area connections.

Wavelength: The SFP-10G-SR uses a laser with a wavelength of 850 nanometers, while the SFP-10G-LR uses a laser with a wavelength of 1310 nanometers.

How to Choose the Right Module

After understanding the difference between SFP-10G-SR and SFP-10G-LR, we will start from typical application scenarios, combining them with your network requirements, to provide guidance on selecting the appropriate SFP 10G optical module for you.

Data Center

When linking servers, storage devices, or network components within the data center, opt for SFP-10G-SR for short-distance connections like in-rack setups. For cross-rack connectivity, SFP-10G-LR is the best choice.

Intra-Enterprise Network

Establishing high-speed connections within the enterprise, such as inter-floor or inter-department links, demands tailored choices. For shorter intra-floor connections, select SFP-10G-SR. Opt for SFP-10G-LR when spanning different floors.

Remote Office/Branch Office

For network connections linking remote or branch offices with the headquarters, SFP-10G-LR is the preferred module due to its suitability for longer distances, ensuring coverage for remote locations.

Inter-City Data Transmission

When establishing high-speed data connections between cities, the preferred choice is SFP-10G-LR, thanks to its compatibility with longer fiber distances, addressing the needs of inter-city connections.

Budget Constraints

If facing budget limitations and the connection distance permits, SFP-10G-SR is generally the more economical option.

Unlocking the Potential of the SFP 10g module with FS Products

The burgeoning era of digitization has spurred a growing demand for optical modules across various sectors, including enterprise networks, data centers, campus networks, and metropolitan area networks. Building on the diverse applications of optical modules, as a premier network solutions provider, FS.COM offers a diverse range of hot-swappable SFP 10G modules designed to maximize uptime and streamline serviceability. Equipped with Digital Optical Monitoring (DDM) capabilities, each unit is meticulously customized and coded for full-function compatibility. FS products undergo rigorous testing and verification to ensure the seamless and reliable operation of your network.

The following table sorts out the products of these two models (SFP-10G-SR and SFP-10G-LR) on the FS. You can choose the most suitable one according to your needs.

Data Rate (Max)10.3125Gbps10.3125Gbps
Cable Distance (Max)300m@OM3400m@OM410km
ConnectorDuplex LCDuplex LC
Transmitter TypeVCSELDFB
Cable TypeMMFSMF
TX Power-7.3~-1dBm-8.2~0.5dBm
Receiver Sensitivity< -11.1dBm<-14.4dBm
Power Consumption<1W≤1W
Operating Temperature0 to 70°C (32 to 158°F)0 to 70°C (32 to 158°F)
Application RangeOnly used for short distance connectionsOnly used for long distance connections


In short, which product to choose ultimately depends on your network layout and connectivity needs. The above considerations can help you quickly select the right product to achieve the best performance in your specific network environment. If you would like to learn about other types of SFP 10g modules, you can visit the following resources for more information.

Related resource: Other models of SFP 10g modules

Considerations About Optical Transceiver Designing

The rapid expansion of fiber optic networks, including data services measured by data volume or bandwidth, shows that fiber optic transmission technology is and will continue to be a significant part of future networking systems. Network designers are becoming increasingly comfortable with fiber solutions, since the use of which allows for more flexible network architecture and other advantages, such as EMI (Electromagnetic Interference) resilience and data security. Optical transceiver plays an really important role in these fiber connections. And while designing fiber optic transceivers, three aspects need to be considered: environmental situation, electrical condition and optical performance.

What Is a Optical Transceiver?

The optical transceiver is a self-contained component that transmits and receives signals. Usually, it is inserted in devices such as routers or network interface cards which provide one or more transceiver module slot. The transmitter takes an electrical input and converts it to an optical output from a laser diode or LED. The light from the transmitter is coupled into the fiber with a connector and is transmitted through the fiber optic cable plant. Then the light from the end of the fiber is coupled to a receiver where a detector converts the light into an electrical signal which is then conditioned properly for use by the receiving equipment. There are a full range of optical transceivers available in telecommunication market, like SFP transceiver, SFP+ transceiver (eg. SFP-10G-SR shown below), 40G QSFP+, 100G CFP, etc.SFP-10G-SR optical transceiver

Optical Transceiver Designing Considerations

It’s true that fiber links can handle higher data rates over longer distances than copper solutions, which drive the even wider use of optical transceivers. While designing fiber optic transceivers, the following aspects should be taken into consideration.

  • Environmental Situation

One challenge comes to the outside weather—especially severe weather at elevated or exposed heights. The components must operate over extreme environmental conditions, over a wider temperature range. The second environmental issue related to the optical transceiver design is the host board environment which contains the system power dissipation and thermal dissipation characteristics.

A major advantage of the fiber optic transceiver is the relatively low electrical power requirements. However, this low power does not exactly mean that the thermal design can be ignored when assembling a host configuration. Sufficient ventilation or airflow should be included to help dissipate thermal energy that is drawn off the module. Part of this requirement is addressed by the standardized SFP cage which is mounted on the host board and also serves as a conduit for thermal energy. Case temperature reported by the Digital Monitor Interface (DMI), when the host operates at its maximum design temperature, is the ultimate test of the effectiveness of the overall system thermal design.

  • Electrical Condition

Essentially, the fiber transceiver is an electrical device. In order to maintain error free performance for the data passing through the module, the power supply to the module must be stable and noise-free. What’s more, the power supply driving the transceiver must be appropriately filtered. The typical filters have been specified in the Multisource Agreements (MSAs) which have guided the original designs for these transceivers. One such design in the SFF-8431 specification is shown below.


  • Optical Performance

Optical performance is measured as Bit Error Rate, or BER. The problem facing designing optical transceiver lie in the case that the optical parameters for the transmitter and receiver have to be controlled, so that any possible degradation of the optical signal while traveling along the fibers will not cause poor BER performance. The primary parameter of relevance is the BER of the complete link. That is, the start of the link is the source of the electrical signals which drive the transmitter, and at the end, the electrical signal is received and interpreted by the circuitry in the host by the receiver. For those communication links which use optical transceivers, the primary goal is to guarantee BER performance at different link distances, and to ensure broad interoperability with third party transceivers from different vendors.


Fiber technology is becoming maturer, leading to the wider use of optical transceivers. With the three aspects mentioned above in mind, designing fiber optic transceivers should be easier. FS.COM supplies many transceivers which are fully compatible with major brands, including HP compatible transceivers (eg. J4858C).

Consider Two Things Before Deploying 10 Gigabit Ethernet

Over the years, Ethernet technologies have evolved rapidly and amazingly to meet the never-ceasing requirements of higher bandwidth and faster data transmission speeds for high quality network applications, such as live video and video download with high resolution. Through this great evolution, Ethernet technology standards have been designed, like 10 Gigabit Ethernet (GbE).

After IEEE Standard 802.3ae- 2002 for 10GbE was ratified several years ago, some enterprises have begun to deploy 10GbE in their data centers to support bandwidth-needing applications. Before deploying 10GbE, as matter of fact, there are many things that should attract your attention. Here this article lists two important things you need to consider for a reliable 10GbE deployment: 10GbE cabling choices, and 10GbE transceiver types.

10GbE Cabling Choices

Along with the technological revolution, cables used for transmission also experienced progressive development. There are two physical media available for 10GbE transmission: fiber and copper.

10GbE Fiber Cabling Choices

Fiber cables fall on two classifications: single-mode fiber (SMF) and multi-mode fiber (MMF). In SMF, there is only one path for light, while in MMF light flow through multiple paths. SMF is intended for long distance communication and MMF is used for distances of less than 300 m. Commonly used 10GbE ports designed for SMF are 10GBASE-LR, 10GBASE-ER and 10GBASE-ZR, and the ports specified for MMF are 10GBASE-SR and 10GBASE-LRM. It’s of great importance to choose these ports 10GbE transmission when link lengths matter. For example, you can choose a J9150A transceiver when the required distance is less than 300m. In a word, the form factor options depend on your link lengths.

10GbE Copper Cabling Choices

As the structured cabling techniques become mature, copper cabling technology also grasps the chance to develop itself. And more and more people start to choose copper cables as the medium for 10GbE transmission. 10GBASE-T and SFP+ direct attach cables (DAC) standards symbolize copper applications.

10GBASE-T, or IEEE 802.3an-2006, is a standard released in 2006 to provide 10Gbit/s connections over unshielded or shielded twisted pair cables, over distances up to 100 metres (330 ft). It requires the Cat 7 or Cat 6A to reach 100 meters, but can still work on Cat 6, Cat 5E, or even Cat 5 cable when reduced distances are required.

SFP+ DAC is the latest standard for optical transceivers, and it connects directly into an SFP+ housing. In SFP+ DAC cabling assembly, no optical transceiver is used at each end. A cable was invented with each end physically resembling a SFP+ transceiver, but with none of the expensive electronic components. This creation is known as DAC. Actually, besides 10GbE applications, DAC is also considered as a cost-effective solution to replace fiber patch cables sometimes in 40GbE systems. Like QSFP-H40G-ACU10M, this Cisco 40G cabling product is the QSFP to QSFP direct attach passive copper cable assembly designed for 40G links.

QSFP-H40G-ACU10M ,QSFP to QSFP direct attach passive copper cable assembly

10GbE Transceiver Types

After choosing cables, you need to select devices that connect these cables to your networks. These devices are transceivers. 10GbE has four transceiver types: XENPAK (and related X2 and XPAK), GBIC, SFP and SFP+.

XENPAK is a Multisource Agreement (MSA) that defines a fiber-optic or wired transceiver module which conforms to the 10 Gigabit Ethernet (10GbE) standard of the Institute of Electrical and Electronics Engineers (IEEE) 802.3 working group.

X2 defines a smaller form-factor 10 Gb/s pluggable fiber optic transceiver optimized for 802.3ae Ethernet,ANSI/ITUT OC192/STM- 64 SONET/SDH interfaces,ITUT G.709,OIF OC192 VSR,INCITS/ANSI 10GFC (10 Gigabit Fibre Channel) and other 10 Gigabit applications.X2 is initially centered on optical links to 10 kilometers and is ideally suited for Ethernet,Fibre Channel and telecom switches and standard PCI (peripheral component interconnect) based server and storage connections. X2 is physically smaller than XENPAK but maintains the mature electrical I/O specification based on the XENPAK MSA and continues to provide robust thermal performance and electromagnetic shielding. The 10GB X2 fiber optic transceivers series include X2-10GB-SR, X2-10GB-LR, X2-10GB-ER and X2-10GB-ZR, they are designed based on the X2 MSA and IEEE802.3ae. They’re created for the integrated systems solution provide, fiber optics distributor along with other IT distributors.

SFP+, also called SFP Plus, is short for enhanced small form-factor pluggable, an enhanced version of the SFP that supports data rates up to 16Gbit/s. SFP+ 10GbE transceiver series include SFP+ 10GBASE-SR, SFP+ 10GBASE-LR, SFP+ 10GBASE-ER, and so on. Among these types, 10GBASE-SR is widely used when the required distance is less than 500m. Say SFP-10G-SR, this Cisco 10GBASE-SR SFP+ transceiver listed in Fiberstore is designed to support 10GbE applications with the maximum distance reach of 300m.


After discussion, maybe you have obtained a better understanding of 10GbE cables and transceivers, which helps you to better choose the right devices for your 10GbE applications. Fiberstore supplies various numbers of 10GbE cables and transceivers which are quality assured. For more information about 10GbE solutions, you can visit Fiberstore directly.