Optical module transmission distance and related classification

As a photoelectric conversion device, in the optical communication network, the optical module is the most common product. Among the characteristics of optical modules, transmission capacity is the most core and most concerned parameter.

In addition, the transmission distance of the optical module is another core parameter that cannot be ignored. In different fields and links of optical communication network transmission, the characteristics of optical modules are also different.

According to the different transmission distances of optical modules, they can be divided into three types: short-distance optical modules, medium-distance optical modules, and long-distance optical modules. Among them, long-distance optical modules refer to optical modules with a transmission distance of more than 30km. The need for long-distance transmission of network data.

In the actual use of long-distance optical modules, in many cases, the maximum transmission distance of the module cannot be achieved. This is because the optical signal will have a certain degree of dispersion during the transmission of the optical fiber. In order to solve this problem, the long-distance optical module adopts Only one dominant wavelength is my DFB laser as the light source, thus avoiding the problem of chromatic dispersion.

There are long-distance optical modules in the types of SFP optical modules, SFP+ optical modules, XFP optical modules, 25G optical modules, 40G optical modules and 100G optical modules.

Among them, the long-distance SFP+ optical module adopts EML laser components and photodetector components, which reduces the power consumption of the optical module and improves the accuracy; the long-distance 40G optical module adopts the driver and modulation unit in the transmitting link, and in the receiving The link uses optical amplifiers and photoelectric conversion units to achieve a maximum transmission distance of 80km.

However, the transmission distance of the optical module is not as far as possible, and appropriate solutions should be adopted in due course. The long-distance applications are mainly in the fields of server ports, switch ports, network card ports, security monitoring, telecommunications, Ethernet, and synchronous fiber optic networks.