>> Radio frequencies are also susceptible to hackers who can intercept signals, Islim notes, whereas visible light could be protected by opaque objects. So the

>> Radio frequencies are also susceptible to hackers who can intercept signals, Islim notes, whereas visible light could be protected by opaque objects. So the security hinges upon it being easier to block visible light than more conventional radio signals. Seems that a fibre optic is still more secure and likely to achieve greater range for the same transmission power.