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Views: 399 Author: Anna Publish Time: 2024-12-26 Origin: Site
Classification by package type
Factors to consider when purchasing optical modules
Fiber optic communication cannot do without the support of optical modules. There are a large number of optical modules on the market, which also causes many people to have a limited understanding of optical modules and not know how to choose the optical modules that suit them. In this article, YXFiber will introduce the information of optical modules. After reading it, you will know how to choose the right optical module.
The optical module consists of optoelectronic devices, functional circuits and optical interfaces. The optoelectronic devices include two parts: transmitting and receiving.
The transmitting part is: the electrical signal with a certain bit rate is processed by the internal driver chip to drive the semiconductor laser (LD) or light-emitting diode (LED) to emit a modulated optical signal of the corresponding rate. It has an automatic optical power control circuit inside to keep the output optical signal power stable.
The receiving part is: the optical signal with a certain bit rate is input into the module and converted into an electrical signal by the optical detection diode. After passing through the preamplifier, the electrical signal of the corresponding bit rate is output.
Optical modules can be classified into 155M, 1.25G, 2.5G, 4.25G, 10G, 40G, 100G, 400G, 800G, etc.
It can be divided into conventional wavelength 850nm band, 1310nm band and 1550nm band, CWDM, DWDM, etc.
It can be divided into single-mode fiber and multi-mode fiber.
It can be divided into hot-pluggable and non-hot-pluggable.
It can be divided into SFP, SFP+, XFP, SFP28, QSFP+, CXP, CFP, QSFP28, QSFP-DD, etc.
Generally, the central wavelengths of optical modules are 850nm, 1310nm and 1550nm. The central wavelength is relatively single. We call this type of light "black and white light" or "gray light".
Color optical modules carry lights of several different central wavelengths, so the intersection is colorful. We call this type of light "color light". Color optical modules are divided into two types: coarse wavelength division multiplexing (CWDM) and dense wavelength division multiplexing (DWDM). In the same band, there are more types of dense wavelength division multiplexing modules, so dense wavelength division multiplexing modules make more full use of the band resources.
Lights with different central wavelengths can be transmitted in the same optical fiber without interfering with each other. Therefore, the light with different central wavelengths from multiple color optical modules is combined into one channel for transmission through a passive combiner, and the remote end uses a splitter to split the light into multiple channels according to different central wavelengths, effectively saving optical fiber lines. Color optical modules are mainly used in long-distance transmission lines.
When purchasing optical modules, the following five points are the key factors to consider:
Different optical modules support different transmission distances. Generally speaking, the transmission distance of multimode optical modules is much shorter than that of single-mode optical modules, and the price is also cheaper. For example, the transmission distance of a 10GBASE-SR SFP+ optical module can only reach 400m at most, while the transmission distance of a 10GBASE-LR SFP+ optical module can reach 10km. Therefore, it is very important to figure out the transmission distance you want to achieve.
Optical modules have three main data transmission modes: simplex, half-duplex and full-duplex. Simplex transmission only supports data transmission in one direction; half-duplex transmission allows data transmission in two directions, but only allows data transmission in one direction at a time; full-duplex transmission allows data in two directions to be transmitted simultaneously. It is best to choose an optical module that supports full-duplex transmission.
Copper cable and optical cable are the two most widely used transmission media at present. Therefore, some optical modules are designed with electrical ports, and some optical modules are designed with optical ports. Generally speaking, optical modules are often used in 10G and 40G Ethernet transmission applications, while electrical modules are used in 100M and 1G Ethernet applications. In addition, the transmission distance of optical modules is generally longer than that of electrical modules.
The working environment temperature of the optical module should not be too high. If it exceeds the temperature that the optical module can withstand, link failure is likely to occur. Therefore, optical modules with good heat resistance should be selected.
Through the above introduction, we can clearly know the meaning, classification, and purchase considerations of optical modules. So, do you know how to choose a suitable optical module?
