Low versus no water peak in optical fiber

摘要

Several telecommunication transmission bands have been defined and standardized-from the origi-nal O-band to the U/ XL bands (see table). The U/XL-bands and E-band have typically been avoided because they are associated with high transmission-loss regions. The U/XL band, residing at the very end of the transmission window for silica glass, has inherently high transmission losses. The E-band represents the water peak region where a standard fiber is most affected by attenuation caused by hy-droxyl ions present within the glass core structure. Today, however, optical fiber manufacturers have dramatically reduced the losses in the E-band.