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A low-cost full-duplex 10Mbps optical transceiver for free-space optical data communication is presented. The transceiver consists three main parts namely interface circuit, transmitter and receiver. The transmitter - based on a simple inverter circuitry, drives a laser diode emitting 635nm visible red beam. The 10-cm-diameter lens was employed for light collimation. Optical-to-voltage signal conversion is performed using a photodiode SFH203 incorporated with a single resistive followed by a low-noise amplifier deploying a dual-gate MOSFET. 10Mbps Ethernet link between two personal computers situated 300 meters apart has been experimentally verified.
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