Li-Fi has been widely talked about, largely due to its capability to deliver a high data rate wireless connectivity.
Li-FI has some very interesting security characteristics too.
Nexor have just released a briefing paper Air-Gaps, Firewalls and Data Diodes in Industrial Control Systems looking the issues around segregating industrial control system networks. What works best: Air Gaps, Firewalls or Data Diodes?
The Data Diode technical model to achieve a one way network connection is relatively simple. However when you start to consider trust and assurance, it gets more complex.
Due to recent security incidents, there is now a significant debate with regard to what is the best way to protect Industrial Control Systems (ICS).