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CWDM (Coarse Wavelength Division Multiplexing) is used to combine or separate up to 18 optical signals over one single fiber optic link. Each signal carried can be at a different rate and in a different format. CWDM systems use uncooled distributed feedback lasers and wideband optical filters that provide lower power consumption and reduced capital and operating costs. Due to ITU-T G.694.2 specification the CDWM uses operating wavelength grid between 1271 nm and 1611 nm devided into 20 nm wide chanels, including wavelengts within the „waterpeak“ region. In this system signal can be transmitted to the distance of up to 100 km without amplifiers.