Question
With reference to Visible Light Communication (VL(c) technology, which of the following statements are correct?
1. VLC uses electromagnetic spectrum wavelengths 375 to 780 nm
2. VLC is known as long-range optical wireless communication.
3. VLC can transmit large amounts of data faster than Bluetooth.
4. VLC has no electromagnetic interference.
Select the correct answer using the code given below:
(a) 1, 2 and 3 only
(b) 1, 2 and 4 only
(c) 1, 3 and 4 only
(d) 2, 3 and 4 only
Answer:
C
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Explanation:
1. Statement 1 is correct. One of the key advantages of visible light communication (VLC) is its broad range, covering the entire visible light spectrum from 380 to 700 nanometers.
2. Statement 2 is incorrect. Unlike radio waves, which can penetrate opaque surfaces, light cannot pass through such surfaces. Therefore, VLC is indeed limited to short-range transmission.
3. Statement 3 is correct. VLC benefits from the high speed of light, which travels at approximately 186,000 miles per second. This speed surpasses the 344 meters per second traveled by radio waves in air, enabling VLC to transmit data at significantly faster rates compared to Bluetooth technology.
4. Statement 4 is correct. Unlike radio frequency (RF) communication, VLC is not susceptible to interference from electromagnetic sources. This is due to its utilization of visible light, which operates in a different frequency range, providing a high-bandwidth and interference-immune communication method.