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There are CWDM/DWDM/LWDM always in optical communication industry, Wavelength Division Multiplexing ( WDM ) is a fiber-optic transmission technique that enables the use of multiple light wavelengths (or colors) to send data over the same medium. Two or more wavelengths can travel on one fiber, and several signals can be transmitted in an optical waveguide at differing wavelengths or frequencies on the optical spectrum. Advances in optoelectronic components allowed the design of systems that simultaneously transmitted multiple wavelengths of light over a single fiber, significantly increasing fiber capacity. Then, WDM transmission was applied. Multiple high rate data streams of 10 Gb/s, 40 Gb/s, 100 Gb/s, 200 Gb/s and more recently, 400 Gb/s and 800 Gb/s, each carrying distinct throughputs, can be multiplexed over a single fiber. There are three types of WDM defined by ITU-T: Coarse WDM (CWDM): CWDM is defined by WDM systems with fewer than 18 active wavelengths per fiber, from 1270nm t...

Wavelength division multiplexing (WDM), including CWDM (coarse wavelength division multiplexing) and DWDM (dense wavelength division multiplexing), etc. It refers to the coupling of multiple signals of different wavelengths on a single fiber for simultaneous transmission. It has multiplexer and de-multiplexer. The multiplexer (MUX) combines multiple signal wavelengths in a single fiber for transmission at the transmitter side; the de-multiplexer (DEMUX) separates multiple wavelength signals transmitted in a single fiber at the receiver side. The main purpose of WDM is to increase the available bandwidth of the fiber, which can be expanded by WDM without the need to lay more fibers. What is the difference between CWDM and DWDM? 1.  Different wavelength intervals CWDM: wavelength interval ≥20nm, total 18 bands  of 1 2 70 nm ~1610nm with 20nm interval, DWDM: wavelength interval <10nm, usually using 1528nm~1565nm band with wavelength interval of 200GHz (1.6nm), 100GHz (0.8nm) ...