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WDM (Wavelength Division Multiplexing) combines two or more optical carrier signals of different wavelengths (carrying various information) at the transmitting end through a multiplexer (also known as a multiplexer), and The technology of transmitting in the same optical fiber coupled to the optical line; at the receiving end, the optical carrier of various wavelengths is separated by a demultiplexer (also called a demultiplexer or demultiplexer), and then the optical carrier is The receiver performs further processing to restore the original signal. This technology of simultaneously transmitting two or more optical signals of different wavelengths in the same optical fiber is called wavelength division multiplexing.
Wavelength division multiplexing is a technology that uses multiple lasers to simultaneously send multiple lasers of different wavelengths on a single fiber. Each signal is transmitted in its unique color band after being modulated by data (text, voice, video, etc.). WDM can greatly increase the capacity of the existing fiber optic infrastructure of telephone companies and other operators. Manufacturers have introduced WDM systems, also called DWDM (Dense Wavelength Division Multiplexing) systems. DWDM can support the simultaneous transmission of more than 150 light waves of different wavelengths, and each light wave can reach a data transmission rate of up to 10Gb/s. This system can provide a data transmission rate of more than 1Tb/s on an optical cable that is thinner than a hair.
Optical communication is a way in which light carries signals for transmission. In the field of optical communications, people are accustomed to naming them by wavelength instead of frequency. Therefore, the so-called Wavelength Division Multiplexing (WDM) is essentially frequency division multiplexing. WDM is a system that carries multiple wavelengths (channels) on one optical fiber, and converts one optical fiber into multiple "virtual" fibers. Of course, each virtual fiber works independently on a different wavelength, which greatly improves the transmission capacity of the optical fiber. . Because of the economy and effectiveness of the WDM system technology, it has become the main means of expanding the capacity of the current optical fiber communication network. As a system concept, wavelength division multiplexing technology usually has three multiplexing methods, namely, wavelength division multiplexing with wavelengths of 1 310 nm and 1 550 nm, sparse wavelength division multiplexing (CWDM, Coarse Wavelength Division Multiplexing) and dense wave Division Multiplexing (DWDM, Dense Wavelength Division Multiplexing).
CWDM, DWDM, FWDM,AAWG WDM
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