Single Mode Fiber Sfp

The SFP optical module is a hot-swappable small package module in SFP package. The current high speed can reach 10.3G and the interface is LC. SFP optical modules are mainly composed of lasers. In addition, the SFP optical module is composed of: laser: including emitter TOSA and receiver ROSA; circuit board IC; external accessories include: shell, base, PCBA, pull ring, buckle, unlocking piece, and rubber plug. Moreover, SFP optical modules can be classified according to speed, wavelength, and mode.

Rate classification

According to the speed, there are 155M/622M/1.25G/2.125G/4.25G/8G/10G. 155M and 1.25G are mostly used in the market. The technology of 10G is gradually maturing, and the demand is developing in an upward trend.

Wavelength classification

According to the wavelength, there are 850nm/1310nm/1550nm/1490nm/1530nm/1610nm. The wavelength of 850nm is SFP multi-mode, and the transmission distance is less than 2KM. The wavelength of 1310/1550nm is single-mode, and the transmission distance is more than 2KM. Relatively speaking, this The prices of the three wavelengths are cheaper than the other three.

It is easy to confuse bare modules if they are not marked. Generally, manufacturers will distinguish them by the color of the pull tabs. For example, black pull tabs are multi-mode and the wavelength is 850nm; blue is a module with a wavelength of 1310nm; purple is a module with a wavelength of 1490nm, etc. .

Comparison between single mode fiber sfp and multi mode fiber sfp

There are classifications of multimode and single mode in optical fibers, as well as in SFP optical modules. This article will compare various parameters around these two types of SFP optical modules for easy selection before use.

From the table, we can see that multimode SFP provides an optimal and cheaper solution for shorter distances. The most common multimode SFP is at a wavelength of 850nm, with a maximum length of 550 meters. If you need to extend the multimode transmission distance, you can also choose a wavelength of 1310nm, with a maximum transmission distance of 2km.

In addition to the differences between single mode fiber sfp and multi mode fiber sfp, there are also significant differences between conventional single mode optical modules and multimode single modules. For example, the wavelengths mentioned above have different application ranges, and the cost of a single mode light module is higher than that of a multimode light module. The light source of a multimode light module is a light-emitting diode or laser, while the light source of a single mode light module is LD or LED with narrow spectral lines. Before determining the use of optical modules, these comparisons need to be understood in advance.

Q: What is the difference between SFP and SFP+ optical modules?

1. Different parameters

1) Optical module SFP: It is a hot-swappable small package module in SFP package. The current maximum speed can reach 10.3G and the interface is LC.

2) Optical module SFP+: It is a hot-swappable optical transceiver that is independent of communication protocols. The wavelength of transmitted light is usually 850nm, 1310nm or 1550nm. It is used for 10Gbps SONET/SDH, fiber channel, gigabitEthernet, and 10 gigabit Ethernet. and other applications, including DWDM links.

2. Different communication standards

1) Optical module SFP: IEEE802.3, SFF-8472;

2) Optical module SFP+: supports SONET, GigabitEthernet, Fiber Channel (FiberChannel) and some other communication standards.

3. Different wavelengths

1) Optical module SFP: According to the wavelength, it is divided into 850nm/ 1310nm/ 1550nm/ 1490nm/ 1530nm/ 1610nm. The wavelength of 850nm is SFP multi-mode.

2) Optical module SFP+: 850 nm wavelength/550 meter distance MMF (SX), 1310 nm wavelength/10 km distance SMF (LX), 1550 nm wavelength/40 km distance XD, 80 km distance ZX, 120 km EX or EZX for distance, and DWDM.

Q: What are the functions of SFP optical modules?

The specific functions of SFP optical modules include:

1. Used as an optical interface to receive and receive optical signals, and connect to optical fibers and pigtails.

2. Introduce the optical signal into the light plate and process it in the light plate.

3. The reason why optical modules are used on the optical board instead of directly fixing the optical interface on the optical board is because using optical modules can ensure that the optical board can adapt to various optical interfaces when using SC, FC⌄LC pigtail connections, can be solved by replacing the corresponding optical module.

4. The optical module is easy to replace when it breaks.

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