Multi-wavelength filtering with a waveguide integrated phase-modulated Bragg grating

Area of Science:

• Photonics
• Materials Science
• Optical Engineering

Background:

• Integrated photonics requires precise control over light manipulation.
• Band-rejection filters are crucial components in optical systems.
• Existing filters often lack flexibility in customization.

Purpose of the Study:

• To present a novel multi-wavelength band-rejection filter design.
• To demonstrate precise customization of optical filter characteristics.
• To validate the design through experimental demonstration.

Main Methods:

• Utilizing a titanium dioxide-coated silicon-on-insulator platform.
• Employing a phase-modulated waveguide-based Bragg grating with varied periods.
• Applying an iterative Fourier transform algorithm to optimize phase functions.
• Dividing the grating into super-periods for tailored rejection bands.

Main Results:

• Achieved precise customization of integrated waveguide filters.
• Demonstrated control over the number and separation of rejection bands.
• Experimental validation confirmed the filter's performance.
• The phase-modulated Bragg grating enables flexible filter design.

Conclusions:

• The proposed phase-modulated Bragg grating offers a versatile platform for integrated optical filters.
• This technology allows for tailored optical filtering solutions.
• The method is experimentally validated, paving the way for practical applications.