Views:0 Author:Site Editor Publish Time: 2021-08-17 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 are the advantages of EDFA optical amplifiers?
What are the application forms of EDFA optical amplifier?
What are the working systems of EDFA optical amplifier?
EDFA optical amplifier has many excellent benefits and many advantages in the system application.
Firstly, the working wavelength of EDFA is just in the best band (1500-1600nm) of optical fiber communication. The coupling loss with the transmitted light is very small, up to 0.1dB. Secondly, EDFA has high gain, low noise and high output power. Its power gain can reach 40dB, the noise figure can be as low as 3-4db, and output power can reach 14-20dbm. It is worth mentioning that the gain characteristic of EDFA is independent of the polarization state. Thirdly, for multi-channel transmission, EDFA has high isolation and no crosstalk, which is suitable for WDM system. The pump power of erbium-doped fiber is low, only several milliwatts, while Raman amplifier needs 0.5 ~ 1W pump source. The bandwidth of EDFA is wide. In 1550nm window, the bandwidth is 20 ~ 40nm, which can be used for multi-channel transmission and is conducive to improving the transmission capacity. Finally, EDFA also has the characteristics of low connection loss. Because its main body is a section of erbium-doped fiber, which belongs to the fiber amplifier, it is easier to connect with the fiber, and the connection loss can be as low as 0.1dB.
EDFA optical amplifier has four main applications, which are transmitter power amplifier, preamplifier, optical repeater and optical access network node amplifier.
At first, using EDFA as the power amplifier of transmitter is to connect EDFA to the output of transmitter to increase the output optical power so as to extend the communication transmission distance. Secondly, for the preamplifier of the optical receiver, it is generally required to have low noise and high gain characteristics. EDFA optical amplifier is just characterized by low noise. It can be used as the pre-amplifier of the receiver to greatly improve the sensitivity of the optical receiver. In addition, 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 all-optical network. Finally, due to the excessive number of distributed nodes in the optical access network, the distributed optical power signal will be reduced. Connecting EDFA before the distribution node can improve the optical power of the distribution node, so as to improve the optical signal power of each branch, and ultimately improve the transmission quality of the access network.
EDFA can be used in large capacity and high-speed optical communication system to make up for the defects of low sensitivity of high-speed system receiver and short transmission distance without relay. It can also be used in long-distance optical communication system, which can increase the relay distance, reduce the number of regenerative repeaters, and greatly reduce the construction cost. It can also be used to compensate the optical loss caused by power distribution in the optical fiber user access network system and play the role of relay. In addition, adding EDFA to WDM system can solve the problem of insertion loss and reduce the influence of dispersion. EDFA used in optical fiber CATV system can compensate the insertion loss of optical power distributor before distribution, and greatly improve the scale of distribution network and the number of users. In the all-optical communication system, the combination of wavelength division multiplexing and fiber amplifier can realize the all-optical communication network without upper and lower optical path, and expand the network scale.
The unique advantages of EDFA optical amplifier have been recognized by the world, and more and more widely used. 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 interested in EDFA optical amplifier industry or have purchase demand, you can consider our cost-effective products.