Views:0 Author:Site Editor Publish Time: 2021-08-05 Origin:Site
EDFA is a kind of special optical fiber which is formed by implanting trivalent ions of the rare earth element erbium into the fiber core. It can directly amplify the optical signal of a certain wavelength under the action of pump light, so it is called an erbium-doped fiber amplifier. The birth of the EDFA fiber amplifier is a revolutionary breakthrough in the field of optical fiber communication. It makes long-distance, high-capacity, high-speed optical communication possible, and is an indispensable important device for DWDM system, high-speed system and all-optical network in the future. Its research and application are of great significance to the development of optical fiber communication.
Here is the content list:
How does EDFA optical amplifier work?
What are the advantages of EDFA optical amplifier?
What is the Function of the EDFA Optical Amplifier？
The reason why EDFA optical amplifier can amplify the optical signal is that under the action of the pump light source, the particle number inversion distribution appears in the erbium-doped fiber, resulting in stimulated radiation, so that the optical signal is amplified.
When the fiber is continuously excited by the pump source laser, the ground state particles of the erbium ions gain energy and transfer to the high energy level. Due to the instability of the particle at the high energy level in the excited state, it will rapidly descend to a metastable state through the nonradiative transition process. At this point, the number of particles in the metastable state level is increasing due to the continuous excitation of the pump source, while the number of particles in the ground state level is decreasing. In this way, the inversion of particle number distribution in erbium-doped fiber is realized, which provides conditions for optical amplification. When the photon energy of the input optical signal is equal to the energy difference between the metastable state and the ground state, the metastable particles will jump to the ground state in the form of stimulated radiation and emit the same photons as the photons in the input optical signal. In this way, the number of photons in erbium-doped fiber is greatly increased, the input optical signal becomes a strong output optical signal, and the optical signal is amplified.
Compared with the traditional amplification method, the fiber amplifier does not need simultaneous interpreting processes, such as photoelectric conversion, electro-optical conversion and signal regeneration. It can directly amplify optical signals and has good conversion performance. Among them, EDFA optical amplifier is particularly attractive. Because it not only has the advantages of fiber amplifier, but also has the advantages of high gain, low noise, wide working band, high output power and high pump efficiency. In system applications, it also has the advantages of low insertion loss, insensitivity to polarization, small inter-channel crosstalk, transparent transmission rate and format, and system upgrade.
1. Amplification power
EDFA optical amplifier is used as a power amplifier, behind the combiner. It is used to enhance the power of multi wavelength signal after combining, increase the power of fiber before entering, and then transmit, so as to extend the communication transmission distance.
2. Compensation line transmission loss
EDFA optical amplifier is used as the line amplifier, behind the power amplifier. The sensitivity of the optical receiver can be improved by periodically compensating the transmission loss of the line.
3. Amplify the signal
EDFA optical amplifier can be used for signal amplification, which can improve the sensitivity of the receiver when the optical signal-to-noise ratio meets the requirements.
4. Improve transmission quality
EDFA optical amplifier can be used as a node amplifier in optical access network. It can improve the optical power of the distribution node before 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.
Due to the advantages and functions of the EDFA optical amplifier, its application is more and more extensive with the further improvement of its performance, and its development is more and more concerned. All the products produced by Hengchi Electronic Equipment Co., Ltd. can stably serve optical fiber communication engineering and obtain a high evaluation. If you are engaged in EDFA optical amplifier industry or have purchase demand, you can consider our high quality products.