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  DWDM is a transmission technology in optical fiber communication. It uses one optical fiber to transmit multiple optical carrier signals of different wavelengths at the same time, and divides the wavelength range used by the optical fiber into several channels. The channel transmits optical signals. Therefore, DWDM has greatly improved the transmission capacity of the optical communication system. The appearance of Erbium-doped fiber amplifier ( EDFA ) makes DWDM optical signal transmission farther.   1. Introduction to the principle of EDFA Erbium (Er) is a rare earth element. When making an optical fiber, a certain proportion of erbium element is added to form an erbium-doped optical fiber, which has the effect of amplification. Erbium ions have three working energy levels: E1, E2 and E3. Among them, E1 has the lowest energy level and is called the ground state; E2 is the metastable state; E3 has the highest energy level and becomes the excited state. In the case of not be...

  DWDM is a transmission technology in optical fiber communication. It uses one optical fiber to transmit multiple optical carrier signals of different wavelengths at the same time, and divides the wavelength range used by the optical fiber into several channels. The channel transmits optical signals. Therefore, DWDM has greatly improved the transmission capacity of the optical communication system. The appearance of Erbium-doped fiber amplifier ( EDFA ) makes DWDM optical signal transmission farther. 1. Introduction to the principle of EDFA Erbium (Er) is a rare earth element. When making an optical fiber, a certain proportion of erbium element is added to form an erbium-doped optical fiber, which has the effect of amplification. Erbium ions have three working energy levels: E1, E2 and E3. Among them, E1 has the lowest energy level and is called the ground state; E2 is the metastable state; E3 has the highest energy level and becomes the excited state. In the case of not being exc...

  Dense Wavelength Division Multiplexing ( DWDM ) is the ability to multiplex optical signals of different wavelengths into the same optical fiber for transmission. This is a technology used to increase bandwidth on existing fiber optic backbone networks. DWDM optical transmission system usually has the following optical devices: wavelength conversion unit (OTU), Wavelength division multiplexer (OMU/ODU, also called Mux/demux), Optical amplifier (BA/LA/PA), Dispersion compensation unit (DCM) The customer-side optical module passes through the OTU, and the wavelength is converted into DWDM light near 1550nm, and then enters the DWDM wavelength division multiplexer, where multiple lights of different wavelengths are combined on one optical fiber for transmission. , the optical power will drop, and it is necessary to increase the amplifier (BA/LA/PA) to make up the optical power. In the process of transmission, light is not always transmitted in a straight line. The farther the trans...

Optical fibre amplifier (OFA) is a new type of all-optical amplifier used in fibre-optic communication lines to amplify signals. According to its position and role in the fiber optic line, it is generally divided into three kinds of relay amplification, pre-amplifier , line amplifier and boost amplifier. Compared with the traditional semiconductor laser amplifier (SOA), OFA does not need to go through the complex process of photoelectric conversion, electro-optical conversion and signal regeneration, and can directly amplify the signal all-optical, with good “transparency”, especially for long-distance optical communication relay amplification. It can be said that OFA has laid a technical foundation for the realisation of all-optical communication. Optical fibre amplifier technology involves doping the fibre core of an optical fibre with rare-earth elements that produce laser light, and amplifying the passing optical signal by means of a direct current optical excitation provided by a ...

Dense Wavelength Division Multiplexing (DWDM) is the ability to combine a set of optical wavelengths for transmission over a single fibre. DWDM technology is an extension of optical networks and the main advantage of DWDM is that it is protocol and transmission rate independent, allowing DWDM-based networks to transmit data over IP, ATM, SONET, SDH and Ethernet. DWDM systems typically have the following optical components: DWDM optical modules, DWDM MUX/DEMUX, DWDM OADM and optical amplifiers. Today we talk about EDFA . The EDFA optical amplifier is an optical fibre amplifier that uses erbium ions as a gain medium. Optical amplifiers amplify optical signals over a wide range of wavelengths, which is important for DWDM system applications. In contrast to EDFAs used in CATV or SDH systems, EDFAs used in DWDM systems are sometimes referred to as DWDM EDFAs. To extend the transmission distance of DWDM systems, one can choose from different types of optical amplifiers, including DWDM EDFAs...