LiFi

Light-fidelity (LiFi) is a technology used for free-space communication using visible and near-visible light. It is similar to Wireless Fidelity (WiFi), a technology for wireless local area network communication using microwaves. Microwaves can pass through walls while transmitting signals whereas visible and near-visible light cannot pass through walls. Thus it makes LiFi signal network more secure.

Scientists have recently added a new layer of security to LiFi. Light bounces off from walls and falls on the receiver. So wall boundaries can be used effectively for reflecting signals so that communication is maintained even without line-of-sight communication between the signal source and receiver. Receiving detectors can receive both direct and reflected signals.

Walls painted with fluorescent and phosphorescent paints absorb and then emit light with marginal loss. The paints continue to emit light even several hours after the original source of light has been switched off. This makes the communication signal more effective and secure.

Source: TH

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