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Low-frequency fluctuation induced by injection-current modulation in semiconductor lasers with optical feedback.

Y Takiguchi, Y Liu, J Ohtsubo

|December 20, 2007

Summary

High-frequency modulation of semiconductor laser injection current can synchronize output power with external cavity modes. Detuning this modulation induces low-frequency fluctuations, impacting laser stability.

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Area of Science:

Optics and Photonics
Semiconductor Physics

Background:

Semiconductor lasers are crucial in modern technology.
Optical feedback can destabilize laser output.
Understanding laser dynamics under modulation is essential for device applications.

Purpose of the Study:

To investigate low-frequency fluctuations (LFFs) in semiconductor lasers with optical feedback.
To analyze the effect of high-frequency current modulation on laser output power.
To determine the relationship between modulation frequency and LFFs.

Main Methods:

Applying high-frequency modulation to the injection current of a semiconductor laser with optical feedback.
Analyzing the laser output power for synchronization and fluctuations.
Varying the modulation frequency relative to the external cavity mode frequency.

Main Results:

Synchronization of laser output power observed within +/-3 MHz of the external cavity mode frequency.
Low-frequency fluctuations induced when modulation is detuned from the external cavity mode.
LFFs observed within a +/-100 MHz range around the external cavity mode frequency.

Conclusions:

High-frequency current modulation can control semiconductor laser output power dynamics.
Detuning modulation frequency from external cavity modes is a key factor in inducing LFFs.
The observed phenomena offer insights into laser stabilization and control strategies.