Birefringent filter synthesis by use of a digital filter design algorithm

Area of Science:

• Optics and Photonics
• Optical Engineering
• Materials Science

Background:

• Birefringent filters are crucial optical components for spectral manipulation.
• Designing filters with specific spectral responses and low sidelobes is challenging.
• Existing methods may lack efficiency or precision in parameter determination.

Purpose of the Study:

• To present an efficient method for designing birefringent filters with specified spectral responses.
• To utilize digital filter design and layer-peeling algorithms for filter synthesis.
• To demonstrate the method's effectiveness for bandpass filters with low sidelobes.

Main Methods:

• Employs the Remez algorithm for optimal polynomial approximation of the desired finite impulse response.
• Utilizes a layer-peeling algorithm to compute the birefringent filter's structural parameters.
• Applies the design to a 14-section bandpass filter with a target of -40 dB sidelobes.

Main Results:

• Successfully designed a 14-section birefringent bandpass filter.
• Achieved sidelobes below -40 dB, demonstrating high performance.
• The method provides an efficient route to precise spectral control.

Conclusions:

• The presented method offers an efficient and accurate approach for designing complex birefringent filters.
• The combination of digital and layer-peeling algorithms enables precise control over spectral characteristics.
• The study highlights the potential for advanced optical filter design with minimal error impact.