TIA's Glossary of Telecommunication Terms
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minimum-loss window
Of an optical fiber, the transmission window at which the attenuation coefficient is at or near the theoretical (quantum-limited) minimum. Note 1: If the losses from various mechanisms are plotted on a single graph as a function of wavelength, the minimum-loss window occurs in the vicinity of the wavelength at which the Rayleigh-scattering attenuation curve and the infrared-phonon-absorption curve intersect. Note 2: For silica-based fibers, the minimum-loss window occurs at approximately 1.55 
m. [After FAA]