Why was the zero-dispersion point in single-mode fiber moved to a wavelength of 1,550 nm?

The decision to move the zero-dispersion point in single-mode fiber to a wavelength of 1,550 nm is primarily linked to the benefits of low intrinsic absorption and reduced attenuation at this wavelength. At 1,550 nm, optical fibers have significantly lower losses compared to other wavelengths, which allows for longer transmission distances without the need for repeaters or amplifiers. This characteristic is crucial for telecommunications, as it enhances the overall efficiency of the fiber optic systems.

Additionally, at this wavelength, the effects of scattering and material absorption in the fiber are minimized, ensuring that signals can travel more effectively over long distances. This choice not only maintains high transmission quality but also plays a vital role in supporting high data rates, making it ideal for modern communication systems. Thus, moving the zero-dispersion point to 1,550 nm directly contributes to the optimal performance of single-mode fibers in real-world applications.