Which statement correctly identifies a multi-mode fiber core diameter option?

Which statement correctly identifies a multi-mode fiber core diameter option?

• A. The core is 50 Microns with 125 Micron Cladding
• B. The core is 100 Microns with 140 Micron Cladding
• C. The core is 300 Microns with 350 Micron Cladding
• D. The core is 120 Microns with 150 Micron Cladding

Answer: (B)

Multimode fiber uses a larger core to support multiple light paths, so the core diameter is a key identifier of the type. A core of 100 microns paired with 140 microns of cladding is a recognized multimode diameter option, reflecting a design that accommodates many propagation modes at common wavelengths. This larger core is what enables multimode behavior, as opposed to single‑mode fiber which uses a very small core (around 9 microns). The other paired sizes shown are not standard multimode core/cladding combinations in typical practice, so the 100/140 option is the correct identification for a multimode core diameter.

Multimode fiber uses a larger core to support multiple light paths, so the core diameter is a key identifier of the type. A core of 100 microns paired with 140 microns of cladding is a recognized multimode diameter option, reflecting a design that accommodates many propagation modes at common wavelengths. This larger core is what enables multimode behavior, as opposed to single‑mode fiber which uses a very small core (around 9 microns). The other paired sizes shown are not standard multimode core/cladding combinations in typical practice, so the 100/140 option is the correct identification for a multimode core diameter.