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Tunable Narrowband Fiber Multiwavelength Filter Based on Polarization-Diversified Loop Structure.

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We developed a tunable fiber multiwavelength filter using a polarization-diversified loop structure. This novel filter allows for precise wavelength tuning of narrowband transmission spectra by adjusting waveplate angles.

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Area of Science:

  • Photonics and Optical Engineering
  • Fiber Optics
  • Waveguide Devices

Background:

  • Developing tunable optical filters is crucial for applications requiring precise wavelength control.
  • Existing multiwavelength filters often lack tunability or flexibility in spectral output.
  • Polarization-based optical components offer unique mechanisms for manipulating light properties.

Purpose of the Study:

  • To propose and theoretically analyze a novel wavelength-tunable narrowband fiber multiwavelength filter.
  • To investigate the filter's performance using a polarization-diversified loop structure.
  • To demonstrate experimental verification of the theoretical predictions for wavelength tunability.

Main Methods:

  • Design of a filter comprising a polarization beam splitter, five waveplates (three half-wave plates and two quarter-wave plates), and two polarization-maintaining fiber segments.
  • Theoretical analysis using Jones matrix calculations to determine the relationship between waveplate azimuthal angles and transmittance function phase shifts.
  • Numerical simulation of narrowband transmission spectra for various waveplate angle sets.
  • Experimental validation of the predicted wavelength tuning capability.

Main Results:

  • Theoretical calculations predicted that adjusting waveplate azimuthal angles can introduce phase shifts from 0 to 360 degrees.
  • Simulated multiwavelength spectra demonstrated a wavelength tunability of 0.1 nm by switching between eight selected waveplate angle sets.
  • Experimental results confirmed the theoretical prediction, showing successful wavelength tuning of the narrowband multiwavelength spectrum.

Conclusions:

  • The proposed polarization-diversified loop structure enables effective wavelength tunability in narrowband fiber multiwavelength filters.
  • The filter's spectral characteristics can be precisely controlled by adjusting the azimuthal angles of the integrated waveplates.
  • This work provides a viable method for creating reconfigurable optical filters for various photonic applications.