ETRI: Laser devices for data transmission

2023: Product Announcement

On May 17, 2023, specialists from the South Korean Institute of Electronics and Telecommunications (ETRI) announced the development of a laser device that allows data transmission over a distance of more than 30 km at a speed of 25 Gbps. The project was attended by Eldis, a manufacturer of semiconductor laser diodes. The project has already reached the commercial level.

Scientists say that direct modulation laser diodes (DML) are usually used to increase the bandwidth of communication networks. The technology provides for the use of a single-component chip, which reduces the occupied area and reduces power consumption. ETRI specialists used a different approach: they created an advanced laser diode with an electroabsorption modulator (EML). It modulates the intensity of the output beam much faster than the DML and instantly absorbs light (proportional to the applied voltage). As a result, it becomes possible to significantly increase the speed and length of the data transmission channel.

Data Laser Operation Diagram

The project participants note that only a few companies in the world supply EML products, since the process of their production is fraught with a number of difficulties. The ETRI team has already developed technology to commercialize its product and is counting on its market success.

The researchers also say that the created diode with an electroabsorption modulator received design improvements. Indium-aluminum-gallium arsenide with a high modulation rate, but insufficient reliability, was replaced by indium-gallium arsenide phosphide. As a result, it was possible to achieve a throughput of up to 25 Gbps at room temperature, as well as elevated temperatures (up to 55 degrees Celsius). The modulation rate reaches 100 Gbps, which is important when it comes to modern data centers.^[1]

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