Researchers working on a light-based “Li-Fi” wireless system capable of 100 Gbps speeds, requires direct line of sight to a receiver
Li-Fi-like System Would Bring 100-Gbps Speeds Straight to Your Computer — The light that zips data across the Internet's backbone used …
Context & Ripple Effects
This 2015 demo pushed wireless into territory normally reserved for glass: 100 Gbps over a light beam, roughly the class of throughput the Internet's own fiber backbone runs on. The catch — direct line of sight to a receiver — is the same physics that has dogged every high-frequency short-range scheme since, from Starry's millimeter-wave service, which long struggled with range and reliability, to the Wi-Fi Alliance's WiGig (802.11ad) certification at up to 8 Gbps.
The corpus shows where the idea actually landed commercially: four years later Signify shipped Truelifi Li-Fi lights topping out at 150 Mbps — three orders of magnitude below this lab result — meaning the line-of-sight ceiling held in product form even as the lab numbers climbed.
First-order effects
- The researchers' result proves fiber-class speeds are reachable without fiber, but only across a clean optical path — so the immediate use case is fixed point-to-point links, not mobile devices roaming a room.
Second-order effects
- Commercializers have to price around the constraint: Signify's Truelifi sells Li-Fi as a modest 150 Mbps feature inside ordinary office lighting rather than as a 100 Gbps replacement for wired Ethernet, and it competes for the same desk-adjacent niche against certified WiGig gear at 8 Gbps.
Third-order effects
- If beam-based links keep maturing while radio spectrum stays crowded, indoor networking could split structurally between omnidirectional RF handling mobility and optical or millimeter-wave beams delivering raw capacity to stationary receivers — with backbone research like the E-band experiment hitting 301 Tbps on fiber widening the gap between what the core moves and what the last meter can carry.
The trend: Short-range wireless is fracturing by physics rather than standards, as line-of-sight light and millimeter-wave systems chase capacity that congested radio bands cannot deliver.