The 'water peak' in optical fiber refers to the increased absorption of light at specific wavelengths due to the presence of hydroxyl (OH-) ions within the glass material of the fiber. These OH- ions are impurities that are introduced during the manufacturing process. The water peak is most prominent around the 1383 nm wavelength, but also exists to a lesser extent around 950 nm and 1240 nm. These peaks represent wavelengths where the OH- ions strongly absorb light energy. The impact of the water peak on transmission is that it causes a significant ....
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