(With the rapid development of science/science and technology, the amount of information transmission in the communication field is expanding in an acceleration/speed mode. The information age requires increasingly large-capacity transmission networks. In recent years, the world's operating enterprises and equipment manufacturers have turned their attention to WDM technology. WDM wavelength division multiplexing uses the huge bandwidth of the low-loss region of single-mode fiber to mix light of different rates (wavelengths) for transmission. The digital signals carried by these optical signals of different wavelengths can be of the same rate and the same data format. , or different rates and different data formats.)
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