Wavelength drift suppression of a semiconductor laser with filtered optical feedback from a fiber-optic loop using...

Area of Science:

• Photonics and Optical Engineering
• Semiconductor Device Physics

Background:

• Semiconductor lasers are crucial for many applications but suffer from wavelength drift.
• Controlling laser wavelength stability is essential for high-precision optical systems.

Purpose of the Study:

• To present a novel method for suppressing wavelength drift in semiconductor lasers.
• To stabilize laser output to a specific filter peak using optical feedback.

Main Methods:

• Utilized filtered optical feedback from a long fiber-optic loop.
• Implemented active phase delay control of the feedback light.
• Performed steady-state analysis and experimental validation.

Main Results:

• Achieved a 75% reduction in wavelength drift compared to uncontrolled feedback.
• Demonstrated stable laser wavelength locking to the filter peak.
• Confirmed negligible impact on spectral line narrowing.

Conclusions:

• Active phase delay control is an effective strategy for stabilizing semiconductor laser wavelengths.
• The method enhances laser performance without compromising spectral quality.
• This technique offers a practical solution for applications requiring precise wavelength control.