Intelligent Transportation Applications of Laser Optics Open Air Communication System

Chang, Sheldon · 1995 · ROSA P / United States. Federal Highway Administration

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Summary

This report presents a feasibility study for an Intelligent Transportation System (ITS) utilizing infrared laser optics for open-air communication and automated vehicle control. The research addresses the limitations of prevailing millimeter-wave (RF) technologies, which offer lower spatial and temporal resolution compared to infrared lightwaves. The primary motivation is to develop a cost-effective, high-resolution system that supports both vehicle-to-infrastructure communication and driverless automated highway systems (AHS), thereby advancing the deployment of ITS through private investment rather than heavy public infrastructure spending. The study proposes a system comprising Highway Terminals (HWT) mounted on overhead structures and Vehicle Terminals (VT) installed in cars. These terminals utilize inexpensive semiconductor lasers operating in the 1–2 micrometer infrared range. A key technological component is the Directed and Focusing Laser (DAFL), an electronically controlled phased array antenna for lightwaves integrated onto a single semiconductor chip. The research approach involves theoretical calculations and simulations to evaluate technical feasibility, including signal strength, eye safety, interference elimination, and steering algorithm stability. The design aims to combine communication and AHS functions into a single VT, with estimated mass-production costs between $1,000 and $2,000 per unit. The findings demonstrate that the proposed system can reliably exchange at least one megabyte of data per vehicle-infrastructure encounter under all weather and traffic conditions. For the AHS, simulations confirm that five guiding signals—derived from reflected infrared objects on lane dividers and frontal laser tracking—are sufficient to maintain lateral lane centering and longitudinal headway, even on twisting roads. The system supports various applications, including automatic toll collection, car-pool information exchange, and real-time traffic data dissemination, without requiring vehicles to stop or slow down. The infrastructure costs are projected to be minimal compared to the aggregate cost of vehicle terminals. The significance of this work lies in its potential to accelerate ITS adoption by leveraging private sector investment and existing semiconductor manufacturing capabilities. The authors conclude that while the scientific design is feasible, the production of DAFL devices requires further development and funding. They propose a Phase II research plan to realize the system using servo-controlled beam direction as an interim step and to investigate DAFL fabrication methods. The study positions this laser-based approach as a complementary technology to GPS and microwave systems, capable of enhancing highway capacity and safety within a decade.

Key finding

The proposed infrared communication system can safely and reliably exchange no less than one Megabyte of data each time a vehicle passes a highway terminal under all weather and traffic conditions.

Methodology

modeling

Provenance

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Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.

Topics

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• v2x connected vehicle