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All-electronic frequency stabilization of a DFB laser diode
Optics Express
|August 10, 2017
Summary
This study introduces a novel method for stabilizing laser diode wavelength by controlling junction voltage via dynamic resistance measurement. This technique significantly improves wavelength stability compared to conventional methods.
Area of Science:
- Optoelectronics
- Laser Physics
- Thermal Management
Background:
- Laser diode junction voltage is a sensitive indicator of temperature.
- Temperature fluctuations affect laser diode stability, impacting performance.
- Existing thermal control methods have limitations in precision.
Purpose of the Study:
- To develop a precise method for stabilizing laser diode wavelength.
- To compensate for temperature-dependent internal resistance in laser diodes.
- To improve upon conventional thermal control techniques.
Main Methods:
- Measuring dynamic resistance (∂V/∂I) by modulating injection current.
- Implementing a feedback loop to control junction voltage.
- Comparing performance against thermistor control and uncompensated voltage control.
Main Results:
- Achieved a residual mean frequency shift of 60 MHz (0.5 pm) for a 1651 nm DFB laser diode over a 15°C to 35°C range.
- Demonstrated superior stability compared to conventional thermistor control (-8.4 GHz) and uncompensated voltage control (9.9 GHz).
- The achieved stability was within the laser's inherent center frequency uncertainty (80 MHz).
Conclusions:
- Controlling junction voltage via dynamic resistance measurement offers highly effective laser diode wavelength stabilization.
- This method significantly outperforms traditional thermal control approaches.
- The technique provides a robust solution for applications requiring precise laser wavelength control.
