Rohm Develops VCSEL Module Technology Integrating Light Source and Driving Elements
Published2020.09.02 13:31System accuracy↑ due to less impact on the light receiving sensor
Recently, vertical cavity surface emitting lasers (VCSELs) are being used as laser light sources in facial authentication systems for smartphones and spatial recognition systems for tablets.
As demand for VCSELs continues to grow in industrial inspection systems, etc., ROHM announced on the 1st that it has developed high-output VCSEL module technology that improves the precision of space recognition and distance measurement systems.
Laser Output Comparison [Image = Rohm]
In the case of laser light sources using existing VCSELs, the VCSEL element that serves as the light source and the MOSFET element that drives the light source had to be individually mounted on the substrate. At this time, even if unintentionally, the wiring length between products affected the driving time and output of the light source, making it difficult to realize a single pulse and high-output light source required for high-precision sensing.
ROHM has developed a technology to modularize VCSEL elements and MOSFET elements by integrating them into a single package. Rohm explained that with this technology, it has simultaneously achieved the following: △improved performance of each element, △operation of a single pulse light source of less than 10 ns that excludes the influence of external noise such as sunlight, and △increased output by approximately 30% compared to conventional configurations.
In addition, the VCSEL module (laser light source) manufactured with the technology reduces the reflected light impact on the ToF sensor (light-receiving sensor) installed in the space recognition and distance measurement system by 30% compared to existing products, which helps to improve the precision of the system, it added.
ROHM is promoting the commercialization of VCSEL modules that use this technology by March 2021 for facial authentication systems in mobile devices and industrial unmanned transport robots. In addition, it plans to promote the development of high-output laser technology to support vehicle lidar, etc.
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