Which of the following is a listed pairing for a multi-mode fiber core diameter and cladding?

Which of the following is a listed pairing for a multi-mode fiber core diameter and cladding?

• A. 100 Microns with 140 Micron Cladding
• B. 50 Microns with 90 Micron Cladding
• C. 150 Microns with 180 Micron Cladding
• D. 300 Microns with 320 Micron Cladding

Answer: (A)

In multimode fiber, the core is the light-guiding region and the cladding surrounds it with a lower refractive index to keep light trapped by total internal reflection. The two diameters are listed together as a pairing because they define a specific fiber design that vendors actually manufacture and catalog. Not every combination exists in catalogs; only certain core/cladding pairs are standard or “listed.” A pairing with a 100 µm core and 140 µm cladding is a recognized combination you’ll see in manufacturer tables for some multimode fibers. It fits the pattern of a larger-core fiber with a cladding diameter that accommodates proper wrapping, mechanical strength, and compatibility with connectors and buffers used for that product line. The other options aren’t standard listed pairings in common catalogs, so they wouldn’t be expected to represent cataloged multimode fiber designs.

In multimode fiber, the core is the light-guiding region and the cladding surrounds it with a lower refractive index to keep light trapped by total internal reflection. The two diameters are listed together as a pairing because they define a specific fiber design that vendors actually manufacture and catalog. Not every combination exists in catalogs; only certain core/cladding pairs are standard or “listed.”

A pairing with a 100 µm core and 140 µm cladding is a recognized combination you’ll see in manufacturer tables for some multimode fibers. It fits the pattern of a larger-core fiber with a cladding diameter that accommodates proper wrapping, mechanical strength, and compatibility with connectors and buffers used for that product line. The other options aren’t standard listed pairings in common catalogs, so they wouldn’t be expected to represent cataloged multimode fiber designs.