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  In the field of optical fiber communication, Dispersion Compensation Module ( DCM ) (also called Dispersion Compensation Unit, DCU) is used to compensate dispersion, for example, to compensate dispersion in a very long transmission fiber. Usually, this module provides a certain dispersion (eg, normal dispersion in the 1600nm spectral region), although now there are also modules with tunable dispersion. Inserting the module into a fiber optic link is very simple as there are optical connectors at the input and output. A fiber amplifier can be used to compensate the insertion loss, for example, an erbium-doped fiber amplifier can be used in a 1500nm communication system. A dispersion compensation module is usually placed between two amplifiers.   The dispersion compensation module can be obtained by using the following techniques: 1. A common and simple method is to take a long piece of optical fiber, for example, dispersion-shifted optical fiber, and wind it on a bobbin with a diamete

  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 excited