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Switchable multiwavelength fiber laser based on parallel Sagnac loop interferometer.

Xiaotong Xu, Xuefang Zhou, Mingquan Lai

|August 12, 2025

Summary

This summary is machine-generated.

This study introduces a novel dual Sagnac loop filter capable of switching optical channel spacing for fiber lasers. This adaptable filter enables precise control over wavelength intervals, crucial for advanced optical communication systems.

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Area of Science:

Photonics
Optical Engineering
Fiber Optics

Background:

Fiber lasers are essential for optical communications.
Controlling channel spacing in fiber lasers is critical for system performance.
Existing filtering methods may lack tunability or efficiency.

Purpose of the Study:

To propose and validate a novel tunable filtering device for fiber lasers.
To demonstrate the device's ability to switch channel spacing.
To analyze the impact of filter parameters on wavelength intervals.

Main Methods:

A dual Sagnac loop filtering device was designed and theoretically simulated.
The device's channel spacing was adjusted by tuning a polarization controller.
Experiments were conducted to verify simulation results and construct a multiwavelength fiber laser.

Main Results:

The filtering device successfully switched channel spacing to 0.88 nm and 0.42 nm.
Parameter analysis revealed that polarization-maintaining fiber length and refractive index influence channel intervals.
A multiwavelength fiber laser utilizing the filter achieved stable outputs with the specified channel spacings.

Conclusions:

The proposed dual Sagnac loop filter offers tunable channel spacing for fiber lasers.
The filter's design is suitable for applications in high-speed optical communication systems.
Further optimization of filter parameters can lead to new channel interval combinations.