The wavelength of an optical fiber communication system is zero

A wavelength of 0 is not physically meaningful; typical optical fiber communication systems operate at wavelengths of 850 nm, 1300 nm, or 1550 nm.

In optical fiber communication, the wavelength of light determines how efficiently signals propagate through the fiber. Light at 0 nm does not exist in the electromagnetic spectrum, so it cannot be used for transmission. Standard fiber optic systems use infrared wavelengths because they minimize attenuation and absorption in the glass fiber. The most common wavelengths are 850 nm for multimode fibers, and 1300 nm and 1550 nm for single-mode fibers, with 1550 nm offering the lowest loss and longest transmission distance . The choice of wavelength also affects dispersion and bandwidth. Single-mode fibers are optimized for 1310 nm and 1550 nm, while multimode fibers typically operate at 850 nm and 1300 nm. Wavelength-division multiplexing (WDM) systems use multiple closely spaced wavelengths between 1260 nm and 1670 nm to transmit multiple signals simultaneously over a single fiber . In summary, optical fiber systems cannot operate at a wavelength of 0. Practical systems use specific infrared wavelengths that balance low attenuation, minimal dispersion, and compatibility with available lasers and photodetectors .