Conventional ITU-T G.652 single-mode fibers show the significant attenuation around 1400nm caused by the water absorption peak, thus the 1390 and 1410 wavelengths are not used due to the higher attenuation.
Combined with FS CWDM optical transceivers, optical fiber cables, EDFA, OADM and transponders, etc., it can realize high-density multiplexing, flexible management and expansion of different wavelength optical signals.