Can Fiber Optic Cables Be Used to Carry Sunlight over Long Distances?

Fiber optic cables are known for their ability to transmit digital data using light, but can they also be used to carry massive amounts of sunlight to a distant location?

In this post, we will explore this question in more detail and provide specific examples of why fiber optic cables are not suitable for this purpose.

Why Fiber Optic Cables Are Not Suitable for Sunlight Transmission?

Fiber optic cables are designed to transmit light in a specific way that is optimized for digital signals.

These cables are made of a thin strand of glass or plastic that can transmit light over long distances without losing too much signal strength.

However, the amount of light that fiber optic cables can carry is limited compared to the amount of sunlight required to provide significant illumination over a large area.

For instance, if we consider a clear day, the amount of solar energy that reaches the Earth's surface is approximately 1,000 watts per square meter, according to NASA.

If we assume that we need to illuminate an area of 1,000 square meters with sunlight, we would need to transmit 1,000,000 watts of solar energy to that location.

By comparison, a standard fiber optic cable can carry up to 10 watts of laser light over a distance of 10 kilometers. This example highlights the limited capacity of fiber optic cables for sunlight transmission.

Limitations of Fiber Optic Cable Technology for Sunlight Transmission

Moreover, the technology used in fiber optic cables is not designed to handle the specific requirements of sunlight transmission.

Sunlight is an analog signal that has different characteristics than digital signals.

For example, sunlight is spread out over a wide area, while digital signals are highly focused and can be transmitted over long distances with little loss of signal strength.

Additionally, sunlight requires high intensity to be effective in illuminating large areas, whereas fiber optic cables are optimized for low-intensity digital signals.

Sunlight also requires a high degree of homogeneity, which means that it needs to be evenly distributed across an area.

However, fiber optic cables are optimized for point-to-point transmission, which means that the light is focused on a small area at the receiving end. This discrepancy in the requirements makes it difficult to use fiber optic cables for sunlight transmission.

Inefficiencies of Transmitting Sunlight Using Fiber Optic Cables

Finally, even if fiber optic cables could carry sufficient sunlight, the process of collecting and transmitting sunlight using these cables would be highly inefficient.

Sunlight is subject to reflection, absorption, and scattering, which would cause a significant amount of light to be lost during transmission.

These losses can be reduced by using specialized mirrors, lenses, or concentrators to collect the sunlight and focus it on the fiber optic cable. However, these additional components increase the cost and complexity of the system.

Additionally, the cost of installing and maintaining a system of fiber optic cables for sunlight transmission would be prohibitively expensive compared to other methods of generating and distributing electricity.

For example, concentrated solar power (CSP) systems use mirrors or lenses to focus sunlight onto a receiver that converts the heat into electricity.

CSP systems have higher conversion efficiency and can generate electricity at a lower cost than fiber optic cables. Therefore, CSP systems are a more suitable alternative for generating and distributing solar energy over long distances.


In conclusion, while fiber optic cables are effective for transmitting digital data using light, they are not suitable for carrying massive amounts of sunlight over long distances.

Sunlight requires different transmission characteristics than digital signals, and the limitations of fiber optic cable technology make it difficult to use them for sunlight transmission. Furthermore, the process of collecting and