Views:0 Author:Site Editor Publish Time: 2021-08-10 Origin:Site
EDFA optical amplifier, also known as erbium-doped fiber amplifier, is named because the core component of the amplifier is quartz fiber core doped with trivalent ions of rare earth element erbium. Many excellent characteristics of erbium-doped fiber amplifier make the ultra-high-speed, ultra-large capacity, extra-long distance dense wavelength division multiplexing (WDM) technology become a reality. At present, the EDFA optical amplifier has become an ideal amplifier in modern optical fiber communication systems, and it is also the most widely used optical amplifier in optical fiber communication systems.
Here is the content list:
What are the structures of the EDFA optical amplifiers?
How does EDFA optical amplifier work?
What are the Types of EDFA Optical Amplifiers?
EDFA optical amplifier is mainly composed of erbium-doped fiber (EDF), pump light source, optical coupler (or WDM multiplexer), optical isolator and optical filter. The output power is about 10 ~ 100MW. The function of an optical coupler (WDM multiplexer) is to combine signal light with pump light. The function of an optical isolator is to suppress reflection to ensure the stability of optical amplifiers. The optical isolator at the input eliminates the possible interference caused by the back propagation of amplified spontaneous radiation at the input, and the optical isolator at the output protects the device from the possible reverse reflection from the lower section. The optical filter can eliminate the noise of the optical amplifier, reduce the influence of the noise on the system, and provide the signal-to-noise ratio of the system.
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.
The core components of the EDFA optical amplifier are erbium-doped fiber and pump light source, so the type of EDFA depends on the pump mode of the pump light source. EDFA optical amplifiers can be divided into three types according to different pumping modes.
The first one is forward pumping, which means that the pump source and the output signal are injected into the erbium-doped fiber from the same direction. The EDFA with this pumping mode has good noise performance.
The second type is backward pumped, which means that the pump source and the input signal are injected into the erbium-doped fiber from two opposite directions. Its advantage is that the output signal power is high.
The third type is the bidirectional pump type. It is easy to know that it has both the same direction pump and the reverse pump. The output signal power of EDFA pumped by this way is 3 dB higher than that of a single pump source, and the amplification characteristics are independent of the signal transmission direction.
Since the late 1980s, great breakthroughs have been made in the research of EDFA. With the development of science and technology, we have reasons to believe that EDFA optical amplifiers will have a bright future. Hengchi Electronic Equipment Co., Ltd. is committed to the production of stable performance products through the design of optical fiber and electronic circuits, and has been highly appraised for a long time. If you are also optimistic about the development prospect of the EDFA optical amplifier and want to have a deeper understanding and exchange, you can consider our cost-effective products.