With reference to the “Visible Light Communication” technology, which of the following statements are correct?
- VLC uses electromagnetic spectrum wavelengths 375 to 780 nm.
- VLC is known as long-range optical wireless communication.
- VLC can transmit large amounts of data faster than Bluetooth.
- VLC has no electromagnetic interference.
Select the correct answer using the given code below:
- 1, 2 and 3 only
- 1, 2 and 4 only
- 1, 3 and 4 only
- 2, 3 and 4 only
Explanation
Statement 1 is correct
- Visible Light Communication (VLC) operates in the visible light portion of the electromagnetic spectrum, which ranges from approximately 375 nanometers (nm) to 780 nm.
- This range covers the wavelengths of light that are visible to the human eye. VLC technologies utilize this spectrum for transmitting data through light signals.
Statement 2 is incorrect
- VLC is typically categorized as a short-range optical wireless communication technology. The reason for this is that visible light, unlike radio waves, cannot penetrate walls which limits its effective range.
- In practical applications, this means VLC is best suited for environments where the communication range is within a few meters. For example, VLC is often used in indoor settings such as offices or homes, where devices are relatively close to each other.
Statement 3 is correct
- The VLC system depends on high-speed light waves to transmit data. The visible light spectrum offers a higher bandwidth when compared to other electromagnetic spectrums. As a result, it transmits larger volumes of data in a shorter time.
- The data rates achievable with VLC can reach gigabits per second (Gbps) due to the high frequency of visible light waves and advanced modulation techniques. In contrast, Bluetooth typically offers lower speed.
Statement 4 is correct
- One of the key advantages of VLC is its immunity to electromagnetic interference (EMI), which is a common issue in traditional radio frequency-based communication systems. Since VLC uses visible light instead of radio waves, it is not affected by the same types of interference.
