Virtual reality glasses use a projector that includes a VCSEL chip in combination with other optical components. Monitoring the back reflected light is useful to monitor any damage to the projector components. This disclosure provides VCSEL chip designs with a dedicated, low current channel for damage monitoring. The proposed chip provides a dedicated channel for damage monitoring, and enables performing damage monitoring operation with a narrow pulse with a lower current supply.
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Anonymous, "VCSEL Chip With Dedicated Damage Monitoring Channel", Technical Disclosure Commons, (May 30, 2020)