IrDA vs. Li-Fi
Comparing 2 standards across 13 specifications. 13 key differences identified.
IrDA is a point-to-point, line-of-sight optical data transmission standard developed by the Infrared Data Association. Operating at 850–900 nm over distances up to 1 meter, it evolved from 115.2 kbps Serial Infrared (SIR) to 4 Mbps Fast Infrared (FIR) and 16 Mbps Very Fast Infrared (VFIR) for wireless printing, laptop file exchange, and mobile synchronization.
Light Fidelity (Li-Fi, standardized under IEEE 802.11bb in 2023) is a high-speed, bidirectional, fully networked optical wireless communication (OWC) technology. Utilizing invisible infrared (800–1000 nm) or visible LED light emitters, it transmits data at multi-gigabit speeds with zero radio frequency (RF) emissions, immune to electromagnetic interference.
Specification Comparison Table
13 Parameters| Parameter / Spec | ||
|---|---|---|
|
Optical Wavelength
|
850 to 900 nm | — |
|
Nominal Range
|
0 to 1.0 m (at ±15° cone angle) | — |
|
Standard Speed Tiers
|
SIR (up to 115.2 kbps), MIR (1.152 Mbps), FIR (4.0 Mbps), VFIR (16.0 Mbps), UFIR (96.0 Mbps) | — |
|
Pulse Encoding (SIR)
|
Return-to-Zero (RZ) with 3/16th bit duration pulse | — |
|
Pulse Encoding (FIR)
|
4PPM (4-Pulse Position Modulation) | — |
|
Software Protocol Stack
|
IrLAP (Link Access), IrLMP (Link Management), Tiny TP, IrOBEX (Object Exchange) | — |
|
IEEE Standard
|
— | IEEE 802.11bb-2023 |
|
Optical Wavelengths
|
— | 800 to 1000 nm (Near-Infrared) and 380 to 780 nm (Visible Light Spectrum) |
|
Peak PHY Data Rates
|
— | Commercial systems have demonstrated over 1 Gbps; lab demonstrations have reached far higher (a 2021 IEEE study cited up to 224 Gbps), though the 802.11bb standard itself does not fix a single peak rate |
|
Modulation Schemes
|
— | OFDM (Orthogonal Frequency-Division Multiplexing) with QAM/DCO-OFDM |
|
Electromagnetic Interference (EMI)
|
— | Zero (100% RF-free) |
|
Security Boundary
|
— | Physical room containment (Light cannot penetrate opaque walls) |
|
Primary Applications
|
— | Hospital surgical suites, defense/government SCIFs, commercial aviation cabin networking, industrial automation |