Fiber Optic Amplifiers for High Quality and Ultra Long Distance Transmission

With the development of technology, optical fiber amplifier has also been introduced into the application of optical fiber communication, which can amplify data signals and achieve ultra-long distance transmission. There are many kinds of optical fiber amplifiers, and EDFA is mainly used. Optical Fiber Amplifier (OFA) is a new type of all-optical amplifier, which is used to amplify data signals in optical fiber communication. Fiber amplifier technology is to mix rare elements that can form lasers in the fiber core, and according to the direct current excitation of the laser, the passing optical signal is amplified. An optical-electrical-optical reconstruction wireless amplify is used as a traditional optical fib transmission system, and that regenerative repeater is harmful to the reliability and the stability of the system, so that an all-optical transmission type repeater can be used for replace the regenerative repeater, and the data signal is directly amplified and transmitted on an optical path, so that the safety, the reliability and the stability of the system are realized. Machines and devices that may be used include erbium doped fiber amplifiers (EDFA), praseodymium doped fiber amplifiers (PDFA), niobium doped fiber amplifiers (NDFA). At present, the erbium-doped fiber amplifier is the main choice. Erbium-Doped Fiber Amplifier (EDFA) Erbium-Doped Fiber Amplifier (EDFA) is also known as fiber amplifier, amplifier and optical amplifier. Its main function is to amplify the optical power of C-band, so as to realize long-distance transmission. It is the most widely used fiber amplifier at present. According to the location and main parameters of EDFA application, it is usually divided into the following categories: 1. Power fiber amplifier, commonly known as BA. Optical power amplification at the radioactive end. 2. line fib amplifier, commonly refer to as LA. Optical power amplification in the middle of cable. 3. Preamplifier, commonly known as PA. Optical power amplification at receiving end. The main parameters of the three different EDFA models are different. EDFA — 1U rack-mounted EDFA — main control board 100G SOA amplifier The semiconductor optical amplifier is generally called SOA. The SOA can realize the optical signal amplification of 1310nm at the rate of 100G and 40G. Normally, the amplification band is 1230 to 1360 nm, including 1310 nm optical wavelength. The product key is divided into 2 * 2/4 * 4/6 * 6/8 * 8, each of which can complete 2.4.6.8 channels of 1310nm 100 G optical signal amplification. SOA-master control panel Raman fiber amplifier (Raman Fiber Amplifier, RFA), is the use of strong laser transmission in the fiber when the third-order discrete system effect, namely stimulated Raman scattering effect (SRS: Stimulated Raman Scattering) to work. Advantages: RFA is an ultra-wideband optical fiber amplifier: the lossless section of ordinary optical fiber is 1270nm ~ 1670nm, EDFA only works in the range of 1525 nm ~ 1625nm, and RFA can amplify all-optical wavelength. Low noise figure values: When used in conjunction with the EDFA, the system noise figure can be reduced, and the wireless relay spacing can be increased. Can complete distributed amplification: complete long-distance transmission and remote control of pump spectrum, especially suitable for deep sea, desert optical cable and other places where it is not convenient to set repeaters. Due to a series of advantages of Raman amplifier, it is possible to become the next generation of popular optical transmission amplifier.

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