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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...

  With the rapid development of 5G networks, the demand for network data transmission is increasing exponentially. As the underlying bearer network, the transmission capacity of optical networks is crucial to the development of 5G networks. One of the magic weapons to expand the transmission capacity of optical networks is to continuously dig deep into the available band resources of optical fibers, that is, to continuously expand the transmission path width of optical networks. The wider the transmission road, the transmission capacity of the optical network will naturally increase. Next, I will talk to you about these bands of optical fiber.   T raditional band As the name implies, optical fiber communication is the communication in which light is used as an information carrier and optical fiber is used as a transmission medium. However, not all light is suitable for fiber optic communication. Different wavelengths of light (which can be simply understood as light with diffe...