Which fiber type is typically used for longer-distance communications due to its smaller core size?

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Study for the Network Security Instructional Terminology Test. Enhance your knowledge with multiple choice questions, each accompanied by hints and explanations. Ensure readiness for your exam!

Multiple Choice

Which fiber type is typically used for longer-distance communications due to its smaller core size?

Explanation:
Light travels through a fiber by following different paths, or modes. A larger core lets many modes propagate, and those modes travel at slightly different speeds, causing modal dispersion that broadens pulses as distance increases. A smaller core supports essentially a single mode, so there’s far less dispersion and the signal can stay crisp over longer distances. That’s why single-mode fiber, with its ~8–10 micron core, is used for long-distance links. Multi-mode fiber has a much larger core (roughly 50–62.5 microns), which increases dispersion and limits distance and bandwidth. The other options refer to connector types, not the fiber itself, so they don’t determine how far a signal can travel.

Light travels through a fiber by following different paths, or modes. A larger core lets many modes propagate, and those modes travel at slightly different speeds, causing modal dispersion that broadens pulses as distance increases. A smaller core supports essentially a single mode, so there’s far less dispersion and the signal can stay crisp over longer distances. That’s why single-mode fiber, with its ~8–10 micron core, is used for long-distance links. Multi-mode fiber has a much larger core (roughly 50–62.5 microns), which increases dispersion and limits distance and bandwidth. The other options refer to connector types, not the fiber itself, so they don’t determine how far a signal can travel.

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