What unit denotes the size of a fiber's core, cladding, and coating?

What unit denotes the size of a fiber's core, cladding, and coating?

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

Answer: (A)

Fiber dimensions are measured in micrometers. The core, cladding, and coating of an optical fiber are extremely small cross-sections, on the order of a few to a couple hundred micrometers across. For example, the core of a typical single‑mode fiber is about 8–10 micrometers in diameter, while the cladding is around 125 micrometers, and the outer coating brings the total diameter up to roughly 250 micrometers. Nanometers are too small for these overall diameters, and meters or centimeters are far too large. That’s why micrometers are the natural unit for describing the size of a fiber’s core, cladding, and coating.

Fiber dimensions are measured in micrometers. The core, cladding, and coating of an optical fiber are extremely small cross-sections, on the order of a few to a couple hundred micrometers across. For example, the core of a typical single‑mode fiber is about 8–10 micrometers in diameter, while the cladding is around 125 micrometers, and the outer coating brings the total diameter up to roughly 250 micrometers. Nanometers are too small for these overall diameters, and meters or centimeters are far too large. That’s why micrometers are the natural unit for describing the size of a fiber’s core, cladding, and coating.