These devices can be fusion spliced together to maintain a low gap loss after generating a quality cleave in them using the scribe-and-tension method. These devices are produced from multi-story draw towers. (10[1])Erbium-doped amplifiers are used in conjunction with these devices to prevent degradation and allow them to leverage wavelength-division multiplexing. The acceptance angle of these devices corresponds to their numerical aperture. Dispersion limits the maximum length (-5[1])of the multi-mode types of these waveguides, which have a higher ratio of core to cladding diameter than their single-mode type. For 10 points, total internal reflection confines light (10[1])inside what long, thin (10[1])communication (10[1]-5[1])devices used (10[1])for high-speed Internet? (10[1])■END■ (10[4])