Oscillation wavelength selection of semiconductor lasers using a multimode fiber Bragg grating

Area of Science:

• Optics and Photonics
• Semiconductor Laser Technology

Background:

• Semiconductor lasers are crucial light sources, but controlling their output wavelength precisely can be challenging.
• Existing wavelength control methods may suffer from limitations in output power or linewidth.
• Fiber Bragg gratings offer a promising approach for wavelength selectivity in optical systems.

Purpose of the Study:

• To demonstrate a novel method for selecting the oscillation wavelength of semiconductor lasers.
• To achieve high output power and narrow linewidth wavelength locking.
• To validate the effectiveness of the method in both static and dynamic laser operation.

Main Methods:

• Utilized a multimode fiber Bragg grating (FBG) as a wavelength-selective element.
• Adjusted the physical alignment between a semiconductor laser diode and the multimode FBG.
• Characterized the laser output for wavelength, power, and linewidth under varying alignment conditions.

Main Results:

• Successful selection of the semiconductor laser's oscillation wavelength by tuning the alignment.
• Achieved wavelength locking with high output power.
• Demonstrated a narrow spectral linewidth of the locked laser output.

Conclusions:

• Alignment-based wavelength selection using a multimode FBG is an effective technique for semiconductor lasers.
• The proposed method enables robust wavelength locking suitable for both static and dynamic applications.
• This approach offers a practical solution for achieving high-performance laser wavelength control.