Which statement about wavelength information is most accurate?

Which statement about wavelength information is most accurate?

• A. It is in the ultraviolet region and visible
• B. It is in the solar region and invisible
• C. It is in the infrared region and invisible
• D. It is in the microwave region and visible

Answer: (D)

Wavelength information in optical systems refers to where the carrier light sits on the spectrum. For fiber optics, the practical operating range is in the near-infrared, which lies just beyond the visible spectrum and is invisible to the human eye. This region is chosen because silica fiber has its lowest attenuation and favorable dispersion there, with typical data-carrying wavelengths around 1310 nm and 1550 nm. Ultraviolet would be absorbed more strongly by the fiber and can cause damage, the visible region is seen by the eye and isn’t ideal for long-distance communication due to higher losses and dispersion, and microwaves are not compatible with standard glass fiber waveguides. So the most accurate statement is that wavelength information is in the infrared region and invisible.

Wavelength information in optical systems refers to where the carrier light sits on the spectrum. For fiber optics, the practical operating range is in the near-infrared, which lies just beyond the visible spectrum and is invisible to the human eye. This region is chosen because silica fiber has its lowest attenuation and favorable dispersion there, with typical data-carrying wavelengths around 1310 nm and 1550 nm. Ultraviolet would be absorbed more strongly by the fiber and can cause damage, the visible region is seen by the eye and isn’t ideal for long-distance communication due to higher losses and dispersion, and microwaves are not compatible with standard glass fiber waveguides. So the most accurate statement is that wavelength information is in the infrared region and invisible.