The outside coating diameters are expressed in which unit?

The outside coating diameters are expressed in which unit?

• A. Micrometers
• B. Millimeters
• C. Nanometers
• D. Centimeters

Answer: (A)

In fiber optics, dimensions of the fiber components are given in micrometers because the features are very small. The outside coating around the glass adds thickness so the coated fiber diameter is about 245–255 micrometers, which is 0.245–0.255 millimeters. Expressing these diameters in micrometers keeps the values precise and practical for manufacturing and specs. Using nanometers would describe a scale far too fine for a coating, while millimeters or centimeters would be too large to represent the actual coating thickness accurately. So micrometers is the appropriate unit.

In fiber optics, dimensions of the fiber components are given in micrometers because the features are very small. The outside coating around the glass adds thickness so the coated fiber diameter is about 245–255 micrometers, which is 0.245–0.255 millimeters. Expressing these diameters in micrometers keeps the values precise and practical for manufacturing and specs. Using nanometers would describe a scale far too fine for a coating, while millimeters or centimeters would be too large to represent the actual coating thickness accurately. So micrometers is the appropriate unit.