Fiber Bragg grating inscription assisted by a spatial light modulator

Area of Science:

• Photonics and Optical Engineering
• Materials Science

Background:

• Fiber Bragg gratings (FBGs) are crucial optical components for sensing and telecommunications.
• Current FBG fabrication methods often lack precision in controlling transverse dimensions and complex structures.

Purpose of the Study:

• To introduce a novel point-by-point FBG writing technique.
• To demonstrate precise control over FBG inscription within the fiber core.
• To showcase the fabrication of diverse FBG types and transverse structures.

Main Methods:

• Utilized a spatial light modulator (SLM) to precisely control the focal point position.
• Employed a point-by-point inscription method within a static optical fiber.
• Demonstrated the capability to tailor grating pitch in the transverse dimension.

Main Results:

• Successfully inscribed various short-length FBGs, including uniform, phase-shifted, and apodized gratings.
• Achieved precise control over the transverse dimensions of the grating pitch.
• Demonstrated the fabrication of complex transverse grating shapes, such as planes and rings.

Conclusions:

• The proposed SLM-based technique offers enhanced precision and flexibility for FBG fabrication.
• This method allows for the creation of novel FBG designs with tailored transverse structures.
• The technique holds potential for advanced optical sensing and communication applications.