Optical fiber communication technology occupies a pivotal position in information transmission. It greatly improves the data transmission speed and becomes the main communication transmission technology in China. The optical module is a very important part of the optical fiber communication technology. In the parameters of the optical module, we often see such parameters as the SFP-10G-SR and the SFP-10G-LR. If you contact the optical module as long as enough, you will be clearer to understand what it means, but some friends who are new to the industry may not understand the parameters. Let sopto help you comprehend what these parameters mean and what difference and connection they have.
What are the SFP-10G-SR and SFP-10G-LR?
In simple terms, the SFP-10G-SR/LR is a very common type of optical module. Cisco, Huawei and other large manufacturers have this kind of production, mainly used in switches and routers, we can analyze it from the three aspects.
SFP (Small Form-factor Pluggable) refers to a small module that can be hot-pluggable. It can be regarded as an upgraded version of GBIC. It only sizes as the thumb and can greatly increase the port density. The SFP complies with the IEEE802.3, SFF-8472 protocol and can use digital diagnostics through I2C.
10G stands for its maximum transmission rate of 10.3 Gbps. It is suitable for 10 Gigabit Ethernet. 10G optical networks have become popular in telecommunication networks. 10G switches are also being used by more and more people.
SR and LR represent the transmission distance of the optical module. SR, LR, LRM, ER and ZR are more common in the 10G IEEE standard. The transmission distance they represent is from short to long. You can check it by the following table.
10G IEEE standard | Transmission Distance |
10GBASE-SR | 300m or 400m |
10GBASE-LR | 10km |
10GBASE-LRM | 200m |
10GBASE-ER | 40km |
10GBASE-ZR | 80km |
Comparison of appearance
Let us first look at the appearance of the SFP-10G-LR-S optical module and the SFP-10G-SR-S optical module. They are packaged in the form of SFP+ and can be plugged into the SFP+ port of the switch and are also hot-pluggable. The overall size is also the same. Because of different manufacturers, there are differences in the label position and interface design of the two optical modules, but the components are the same and there is no difference between them.
Name | SFP-10G-SR | SFP-10G-LR |
Package type | SFP+ | SFP+ |
Rate | 10 Gbps | 10 Gbps |
Wavelength | 850nm | 1310nm |
Distance（max） | 300m | 10km |
Interface | LC duplex | LC duplex |
Laser type | VCSEL 850nm | DFB 1310nm |
Fiber optic type | MMF | SMF |
DOM | YES | YES |
Transmitted light power | -6～-1dBm | -8.2～0.5dBm |
Received sensibility | < -11.1dBm | < -14.4dBm |
Commercial temperature | 0～ 70°C (32 ～ 158°F) | 0～ 70°C (32 ～ 158°F) |
Features | Maximum transmission rate 10.3Gbps 850 nm VCESL Laser Typical transmission distance 300 meters (OM3 multimode fiber) 3.3V single voltage, TTL logic interface Dual LC interface, hot-pluggable | Maximum transmission rate 10.3Gbps 1310 nm DFB-LD Laser Typical transmission distance 10 kilometers 3.3V single voltage, TTL logic interface Dual LC interface, hot-pluggable |
Application range | Only used for short distance connections | Only used for long distance connections |
1、 The Same Points
The SFP-10G-LR-S optical module and the SFP-10G-SR-S optical module both have a rate of 10.3125 Gbps. Both of them can be applied to 10 Gigabit Ethernet, SDH and SONET networks, and their interface types are LC Duplex.
Both the SFP-10G-LR-S and SFP-10G-SR-S optical modules support the DOM function, which is digital diagnostics. It helps network administrators monitor and report the operating status of the optical module in real time, including the temperature of the optical module. , laser bias current, etc.
2、The Different Points
The wavelength of the SFP-10G-LR-S optical module is 1310nm, and the transmission distance can reach 10km when it is used with a single-mode optical fiber. And the wavelength of an SFP-10G-SR-S optical module is 850nm when it is used with an OM3 multi-mode optical fiber. The transmission distance up to 300m. Therefore, SFP-10G-LR-S optical module is mainly used for long-distance transmission, and the SFP-10G-SR-S optical module is only used for short-distance transmission. But they do not support FCoE link, it is recommended that everyone in accordance with the actual needs of the transmission distance could choose the right light module.
The laser type of SFP-10G-LR-S optical module is DFB 1310nm, whose transmitted optical power is -8.2 ~ 0.5dBm and the receiving sensitivity is <-14.4dBm. The laser type of SFP-10G-SR-S optical module is VCSEL 850nm whose transmitted optical power is -6 to -1dBm, and the receiving sensitivity is <-11.1dBm. The lasers of these two optical modules are different. The application range of DFB lasers is wider than that of VCSEL lasers. At present, the most commonly used lasers in the field of optical communications are FP lasers and DFB lasers. However, VCSEL lasers have not been widely used due to the disadvantages of complicated manufacturing processes and insufficient output power.
There are many manufacturers of SFP-10G-SR/LR, of which the representative is Cisco, and Cisco's switches also occupy a relatively large market share. But in the actual selection process, in addition to the IEEE standard and transmission distance, we also need to consider some other factors, such as compatibility and cost.
There are many Cisco SFP-10G-SR/LR optical modules manufactured by third-party manufacturers on the market, but they are not all compatible and may not be used in the SFP connector of the switch. When purchasing optical modules, It must be guaranteed that it is compatible with the switch.
The second factor is the cost problem. Many users will choose the original optical module. Of course, it is best if the funds are sufficient. The SFP-10G-SR/LR optical module offered by SOPTO has become a more and more popular choice due to its high cost-efficiency and good quality.
The above is simply to answer the question of what the next SFP-10G-SR/LR is. If you want to learn more about optical communications, welcome to Sopto Technology.
Tags : SFP SR/LR ,fiber optic module ,fiber optic transceiver ,SFP-10G-SR/LR
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