ROHM VCSEL Module Technology Raises Output by 30%

by Carolyn Mathas

Rohm unveiled a VCSEL module that uses Time-of-Flight (TOF) systems to achieve greater accuracy in special recognition and distance measuring systems. Commonly used in tablets and smartphone facial recognition, VCSEL demand is increasing given automated guided vehicle (AGV) and industrial inspection systems dependent on gesture and shape recognition.

Applications that require automation, shorter pulse drive, and higher output for the light source also now require higher accuracy sensing, provided by VCSELs.

Currently, the VCSELs and MOSFET to drive the light source are separately mounted, which means that the wiring length (parasitic inductance) between products creates an unintentional effect on the light source output and drive time. This makes it difficult to achieve the high output and short pulses needed for high accuracy sensing.

The new ROHM VCSEL module, however, allows modularization of the VCSEL and MOSFET elements into a single package, minimizing the wiring length between elements. This maximizes the performance of each element resulting in a light source capable of short pulse drive (under 10ns), reducing susceptibility to external noise from sunlight, and enabling up to 30% higher output over conventional solutions.

Used in spatial recognition and ranging systems comprised of a control IC, TOF sensor, and VCSEL module, the amount of light reflected to the TOF sensor is increased by 30% over conventional configurations, improving accuracy in TOF systems.

The solution is expected in Q1 2021. ROHM will also continue the development of high-output lasers for LiDAR in vehicles and other applications.

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