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Laser diode driver on a programmable system on a chip.

Milena Micic, Petar Atanasijevic, Pedja Mihailovic

The Review of Scientific Instruments

|March 5, 2024

Summary

This summary is machine-generated.

A programmable system on a chip offers a versatile laser diode (LD) driver with precise temperature control. This solution provides stable performance and overshoot protection, serving as an alternative to dedicated devices.

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Area of Science:

Electronics
Photonics
Control Systems

Background:

Dedicated laser diode (LD) drivers often lack flexibility and advanced control features.
Integrating control and driver functions onto a single chip offers potential for miniaturization and cost reduction.

Purpose of the Study:

To propose and demonstrate a comprehensive laser diode driver with integrated temperature control using a programmable system on a chip (SoC).
To offer a flexible and high-performance alternative to conventional, dedicated LD driver devices.

Main Methods:

A digital proportional-integral-derivative (PID) controller was implemented on an SoC for precise LD temperature regulation.
Light-current characteristics and frequency response were measured using an external photodiode and an integrated transimpedance amplifier.
Digital implementation of laser diode overshoot protection with soft-start functionality was achieved.

Main Results:

Demonstrated temperature stability of 0.084% and a bandwidth of 2 kHz.
Achieved a full-scale current error of 0.11%.
Successfully implemented digital overshoot protection for enhanced device longevity.

Conclusions:

The proposed SoC-based LD driver provides a stable, accurate, and flexible solution for laser diode control.
The design is adaptable for various laser diode requirements, including the demonstrated 3W infrared LD.
This approach presents a viable alternative to specialized, single-function driver ICs.