Final answer:
Singlemode fiber has more bandwidth than multimode fiber because it uses a smaller core diameter and laser technology which results in less signal distortion over long distances.
Step-by-step explanation:
Singlemode fiber has more bandwidth than multimode fiber. This is because singlemode fibers have a much smaller core diameter, typically around 9 micrometers, and use laser technology to send a single ray of light (mode) straight down the fiber. This allows singlemode fibers to carry signals at a higher bandwidth over much longer distances than multimode fibers, whose larger core diameter leads to more signal distortion over long distances due to modal dispersion.
Multimode fibers, on the other hand, have larger core diameters, usually 50 to 62.5 micrometers, enabling them to carry multiple light modes but at lower bandwidths and for shorter distances. This is suitable for applications where data transmission distance is limited, like within a building or campus. The larger core size allows for the use of less expensive LED-based sources, but the bandwidth remains limited compared to singlemode fibers.