Views:0 Author:Site Editor Publish Time: 2021-05-25 Origin:Site
EDFA refers to the erbium-doped fiber amplifier, which is an optical signal amplifier doped with Er3 + in the fiber core through which the signal passes. It is one of the greatest inventions in optical fiber communication. The main function of the EDFA optical amplifier in an optical fiber communication system is to extend the relay distance. When it is combined with wavelength division multiplexing technology and optical soliton technology, it can achieve ultra-large capacity and extra-long distance transmission.
Here is the content list:
What is the working principle of the EDFA optical amplifier?
How to use EDFA optical amplifiers?
What are the application fields of the EDFA optical amplifier?
The working principle of the semiconductor laser is that under the action of the pump light source, the working substance is in the state of particle number inversion distribution, so it has the function of light amplification. For EDFA optical amplifier, its basic principle is the same. The reason why it can amplify the optical signal is that under the action of the pump light source, the particle number inversion distribution is formed in the erbium-doped fiber, and then the stimulated radiation is produced under the action of the signal light, so as to emit the same photons as the signal light to form the optical amplification.
EDFA optical amplifier is the most widely used optical amplifier in an optical fiber communication. In optical fiber communication system, an EDFA optical amplifier can be used in the following forms.
1. Used as a preamplifier
For the preamplifier of optical receivers, it is generally required to have the characteristics of low noise and high gain. Due to the low noise characteristic of EDFA optical amplifiers, when it is used as a preamplifier of the optical receiver, the sensitivity of the optical receiver can be greatly improved.
2. Used as transmitter power amplifier
The erbium-doped fiber amplifier connected to the output end of the optical transmitter can be used to increase the output power and the input optical power, so as to extend the transmission distance.
3. Used as an optical repeater
The optical repeater is an important application of EDFA in optical fiber communication systems. EDFA is used to replace the traditional optical/electrical/optical repeater to amplify the optical signal in the optical fiber line directly. This not only realizes all-optical communication, but also solves the electronic bottleneck problem of photoelectric exchange, which lays the foundation for the development of an all-optical network.
4. Used as node amplifier in the optical access network
In the optical access network, due to the excessive number of distribution nodes, the distribution optical power signal will be reduced. Connecting EDFA in front of the distribution node can improve the optical power of the distribution node, so as to improve the optical signal power of each branch, and finally achieve the purpose of improving the transmission quality of the access network.
EDFA optical amplifier is widely used in the field of optical fiber communication. First of all, in high-speed optical communication system with a large capacity, EDFA can make up for the defect that the receiver sensitivity of a high-speed system is not high enough and the transmission distance without relay is not far enough. In the long distance optical communication system injected into the land trunk optical transmission system and submarine optical cable transmission system, EDFA can increase the relay distance, reduce the number of regenerative repeaters, and greatly reduce the construction cost. Secondly, in the optical user access network system, the optical amplifier can be used to compensate for the optical loss caused by power distribution. In a WDM system, WDM plus fiber amplifier can not only solve the problem of insertion loss, but also reduce the influence of dispersion. Finally, in an optical fiber CATV system, the insertion loss of the optical power divider can be compensated by an optical amplifier before distribution, which greatly improves the scale of the distribution network and the number of users. In all optical communication systems, WDM and fiber amplifier can realize all-optical communication network with no up and down the optical path, which makes the network scale expand.
EDFA optical amplifier has many excellent features such as high gain, low noise, wide operating frequency bandwidth, high output efficiency and high pump efficiency. It also has the advantages of low insertion loss and insensitivity to polarization state in the system application, which makes WDM technology with ultra-high speed, ultra-large capacity and ultra-long distance possible. Hengchi Electronic Equipment Co., Ltd. has been committed to producing products that can stably serve optical fiber communication projects for 15 years since its establishment, and has been highly praised. If you are engaged in EDFA optical amplifier industry, you can consider our high-quality products.