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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 ...

  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...