Description: Erbium-doped fiber Amplifier EDFA Optical Amplifier
Erbium-doped optical fiber amplifier (EDFA, that is, the optical signal amplifier with Er3 + doped in the fiber core through the signal) is the first optical amplifier developed by the University of Southampton in 1985, and it is one of the greatest inventions in optical fiber communication. Erbium-doped fiber is a kind of fiber with a small amount of rare earth element erbium (Er) ions in quartz fiber, which is the core of Erbium-doped fiber amplifier. Since the late 1980s, major breakthroughs have been made in the research of erbium-doped fiber amplifiers. WDM technology has greatly increased the capacity of optical fiber communication. It is the most widely used optical amplifier in optical fiber communication.
Application: Optical fiber amplifier is a optical amplifier device that directly amplifies the optical signal in optical fiber communication system. In the communication system using optical fiber, it is a technology that directly amplifies the optical signal without converting the optical signal into an electrical signal. Erbium-doped fiber amplifier (EDFA Optical Amplifier, that is, the optical signal amplifier with erbium ion Er3 + in the fiber core through the signal) is the first optical amplifier developed by the University of Southampton in the United Kingdom and Japan’s Tohoku University, it is one of the greatest inventions in optical fiber communication. Erbium-doped fiber is a kind of fiber with a small amount of rare earth element erbium (Er) ions in quartz fiber, which is the core of Erbium-doped fiber amplifier. Since the late 1980s, major breakthroughs have been made in the research of erbium-doped fiber amplifiers. WDM technology has greatly increased the capacity of optical fiber communication. It is the most widely used optical amplifier in optical fiber communication.
Basic parameter
Word name: Erbium-doped fiber amplifier
Related term: Optical Amplifier
Quartz fiber doped with rare earth elements (such as Nd, Er, Pr, Tm, etc.) can form a multi-level laser system, and directly amplify the input signal light under the action of pump light. After providing the appropriate feedback, the fiber laser is formed. The operating wavelength of ND-doped fiber amplifier is 1060nm and 1330nm, but its development and application are limited due to deviation from the optimal port of fiber communication and some other reasons. The operating wavelengths of EDFA and PDFA are in the lowest loss (1550nm) and zero dispersion wavelength (1300nm) window of optical fiber communication respectively, and TDFA works in the S-band, which is very suitable for optical fiber communication system applications. Especially EDFA, the most rapid development, has been practical.
On the basis of the development of erbium-doped fiber, many new fiber amplifiers continue to appear. For example, the dual-band fiber amplifier (DBFA) based on erbium-doped fiber is a broadband optical amplifier, and the broadband can cover almost the entire wavelength division multiplexing (WDM) bandwidth. A similar product is the ultra-wideband optical amplifier (UWOA), which has the coverage bandwidth to amplify up to 100 wavelength channels in a single fiber.
Practical application
The application of Erbium-doped fiber amplifier(EDFA Amplifier) in conventional optical fiber digital communication system can save a lot of optical Repeaters, and the relay distance is greatly increased, which is of great significance for long-distance cable trunk system.
Its main applications include:
1, can be used as light distance amplifier. Traditional electronic fiber optic Repeaters have many limitations. For example, when the digital signal and the analog signal are converted to each other, the repeater should be changed accordingly; When the equipment changes from low speed to high speed, the repeater should be replaced accordingly. Only transmit the same wavelength of light signal, and the structure is complex, expensive, and so on. Erbium-doped fiber amplifiers overcome these shortcomings, not only do they not have to change with the change of signal mode, but also do not need to be replaced when the equipment is expanded or used for optical wavelength division multiplexing.
2, can be used as optical transmitter post amplifier and optical receiver preamplifier. As the post amplifier of the optical transmitter, the transmission power of the laser can be increased from 0db to +10db. When used as a preamplifier of optical receiver, its sensitivity can also be greatly improved. Therefore, only 1-2 erbium-doped amplifiers are set on the line, and the signal transmission distance can be increased by 100-200km.
In addition, erbium-doped fiber amplifier(EDFA Amplifier) to solve the problem. The unique advantages of Erbium-doped fiber amplifiers have been recognized by the world, and have been more and more widely used. However, Erbium-doped fiber amplifiers also have some limitations. For example, in long-distance communication can not be up and down, the station business contact is more difficult, not easy to find faults, pump light source life is not long, with the continuous progress of optical fiber communication technology, these problems will be satisfactorily solved.
Post time: Mar-14-2025