Understanding LiFi frequency range and Wavelength Bands
LiFi (Light Fidelity) operates using visible light, ultraviolet (UV), and infrared light (IR) spectrums for data transmission, rather than the radio frequency spectrum like WiFi. The frequency range of LiFi is determined by the light sources it uses such as visible, UV and IR as mentioned below.
• Visible Light Spectrum: 430 THz to 770 THz (wavelengths between approximately 700 nm to 400 nm)
• Infrared Spectrum: 300 GHz to 430 THz (wavelengths longer than 700 nm)
• Ultraviolet Spectrum: Above 770 THz, though this is less commonly used in LiFi systems
The wavelength and frequency are related as per following equation.
➨ λ = c/frequency , where c = 3 x 10^8 meters/second
LiFi standard compliant device operates from 380 nm to 780 nm wavelength region. This devices operate on one or multiple visible light frequency bands. The LiFi wavelength bands with spectral with and possible code combinations used are mentioned in the table below.
| LiFi Wavelength Bands | Spectral Width (nm) | Code |
|---|---|---|
| 380 to 478 nm | 98 nm | 000 |
| 478 to 540 nm | 62 nm | 001 |
| 540 to 588 nm | 48 nm | 010 |
| 588 to 633 nm | 45 nm | 011 |
| 633 to 679 nm | 46 nm | 100 |
| 679 to 726 nm | 47 | 101 |
| 726 to 780 nm | 54 | 110 |
| Reserved | 111 | |
Table-1: LiFi Bands
Refer LiFi related links to know more about lifi technology and related products.
These frequencies are much higher than those used in WiFi, allowing for higher data transmission rates in LiFi systems.
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