Actlight DPD Converts Light Intensity into Delay Time

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EETimes' Junko Yoshida publishes an article about EPFL spinoff Actlight. The company offers its Dynamic Photodiode (DPD) technology for licensing by other companies. "Serguei Okhonin, Actlight's CEO, told EE Times that his company recently picked up “one of the top five semiconductor companies” as its first licensee.

Instead of using DC bias, the DPD operates at pulsed voltages: the applied voltage is switched from reverse to forward bias. This forward bias induces a large forward current after a time delay, so called triggering time, which depends on the light intensity. This way, we measure the delay time of the large forward current instead of the small photocurrent magnitude.

Because of the large output signal, ActLight claims that DPD needs no amplifier. It can be directly connected to digital circuits.

ActLight expects the first ASIC integrated with the company’s photodiode to emerge in 2019, indicating that there are two or three OEMs already taking a closer look.
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