Optical Wavelength Bands BandWavelength RangeS (short wavelength) band1460-1530 nmC (conventional) band1530-1565 nmL (long wavelength) band1565-1625 nmU (ultra-long wavelength) band1625-1675 nmWhat Is L Band and Other Optical Wavelength Bands? – Carritech www.carritech.com › news › what-is-l-band