CWDM stands for Coarse Wavelength Division Multiplexing. As the name states, it is a form of multiplexed fiber optics, so CWDM networks can send simultaneous, two-way communication. The term “coarse” refers to the wavelength spacing between channels. CWDM utilizes laser signals that differ in increments of 20 nm. A total of 18 different channels are available — with a wavelength range from 1610 nm to 1270 nm — and 8 can be utilized in a single system. Since each channel is capable of data rates of 3.125 Gbps, the aggregate ability is 10 Gbps for any CWDM cable.
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