High speed Ethernet works on optical fiber because of its inherent advantages in terms of speed, bandwidth, and distance.

Optical fiber is a thin, flexible, and transparent fiber made of glass or plastic that can transmit data as pulses of light. It is designed to carry large amounts of data over long distances at high speeds. Here are the reasons why high speed Ethernet works on optical fiber:

1. Bandwidth: Optical fiber provides a much higher bandwidth compared to other types of cables. It can support data rates up to several terabits per second, allowing for the transmission of large amounts of data simultaneously.

2. Speed: The speed of light in a vacuum is approximately 3 x 10^8 meters per second. In optical fiber, the speed of light is slightly slower, but still much faster than electrical signals transmitted through other cables. This high speed allows for fast data transfer and low latency, making it suitable for high-speed Ethernet connections.

3. Distance: Optical fiber can transmit data over long distances without significant loss of signal quality. Unlike coaxial and twisted pair cables, which suffer from signal degradation over longer distances, optical fiber can maintain high-speed data transmission over tens or even hundreds of kilometers.

4. Immunity to Interference: Optical fiber is immune to electromagnetic interference (EMI) and radio frequency interference (RFI), which can degrade the signal quality in other types of cables. This makes optical fiber ideal for environments with high levels of electromagnetic noise, such as industrial settings or areas with a lot of electrical equipment.

5. Security: Optical fiber offers better security compared to other types of cables. It is difficult to tap into or intercept the data being transmitted through optical fiber, making it more secure against unauthorized access.

In conclusion, high speed Ethernet works on optical fiber due to its high bandwidth, speed, long-distance capabilities, immunity to interference, and enhanced security. These advantages make optical fiber the preferred choice for high-speed data transmission in various applications, including telecommunications, networking, and data centers.