A Comparison of Fiber-Optic Cables and Ethernet Cables

Comparison of Basic Characteristics
Differences in Materials and Signal Types
Fiber-optic cables use glass or plastic fibers to transmit data via light signals; network cables use copper wires to transmit information via electrical signals. Light signals are immune to electromagnetic interference, whereas electrical signals are prone to issues when exposed to strong electrical currents or lightning. When installing broadband, users often ask why their internet speed is unstable; in most cases, this is due to interference with the electrical signal.

Physical Structure Characteristics
Fiber optics are categorized as single-mode or multi-mode: single-mode offers longer transmission distances and higher speeds, making it suitable for inter-city connections; multi-mode is lower in cost and better suited for short-distance connections within residential communities. The mainstream Ethernet cable standards are currently Category 5e and Category 6, with Category 7 being a higher-end option. The tighter the wire strands are twisted and the better the shielding, the stronger the resistance to interference. When installing cabling for clients, I always recommend the appropriate model based on the actual distance.

Transmission Performance Comparison
Speed and Bandwidth Performance
Fiber optic bandwidth can reach tens of GHz; 100 Gbps is now common for single-mode fiber. Category 7 Ethernet cables max out at 10 Gbps, while Category 8 can reach 40 Gbps, though Gigabit remains the standard for home use. Many users subscribe to Gigabit broadband but use outdated cables, which naturally limits speeds; switching to Category 6 cables yields immediate results.

Transmission Distance Limits
Single-mode fiber can transmit over 100 kilometers, while multimode fiber can reach several kilometers; Ethernet cables are limited to 100 meters, beyond which the signal attenuates. I’ve encountered villa owners who wanted to run an Ethernet cable from the garage to the third floor; I directly recommended switching to fiber to avoid the need for additional switches.

Cost and Application Scenario Comparison
Production and Maintenance Costs
Fiber optic materials are inexpensive, but splicing equipment is costly and requires professional installation; copper Ethernet cables have higher material costs, but users can install them themselves, and routers and switches are also affordable. Ethernet cables are more cost-effective for ordinary households, while fiber optics are more suitable for enterprise-level projects.