DWDM wavelength division multiplexing principle
DWDM , that is, dense wavelength division multiplexing. "Dense" means that the wavelength channels are very narrow and very close to each other. Taking 100 GHZ dense WDM as an example, the spacing between adjacent channels is only 100 GHZ (or 0.8NM). That is, adjacent channels could be 1530.33NM, 1531.12NM, and 1531.90NM. The working principle of DWDM is to combine and simultaneously transmit multiple signals of different wavelengths on the same optical fiber. In other words, one optical fiber becomes multiple virtual optical fibers. Therefore, if you multiplex 8 OC-48 signals into a fiber, you will increase the transmission capacity of the fiber from 2.5 GB/S to 20 GB/S. Currently, through DWDM technology, the data transmission rate can reach 400GB/S. DWDM is designed for long-distance transmission, and the wavelengths are closely combined during the transmission process to avoid the occurrence of dispersion and attenuation. And with the Erbium-Doped Fiber Amplifier (EDFA)...