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Resolution improvement in speckle wavemeters via mechanically induced multimode fiber mode-mixing method.
Optics Express
|May 4, 2026
Summary
This study introduces a novel method to enhance wavelength resolution in speckle wavemeters using mechanically perturbed multimode fibers. The technique improves sensitivity for precise wavelength measurements, enabling compact, high-performance devices.
Area of Science:
- Photonics and Optical Engineering
- Fiber Optics Sensing
- Wavemeter Technology
Background:
- Speckle wavemeter resolution is limited by speckle pattern sensitivity and information content.
- Increasing optical path length improves resolution but increases environmental susceptibility.
Purpose of the Study:
- To propose and validate a new method for enhancing wavelength resolution in speckle wavemeters.
- To utilize mechanical perturbations in multimode fibers to improve resolution without adding uncontrolled variables.
Main Methods:
- Employing mechanical perturbations on multimode fibers to break symmetry and induce mode coupling.
- Theoretical framework development and numerical simulations of perturbation effects.
- Experimental design and construction of a wavelength measurement setup.
Main Results:
- Demonstrated high sensitivity to wavelength variations, tracking modulations as small as 10 fm.
- Successful wavelength measurements near 1388, 1550, 1598, and 1658 nm.
- Enhanced speckle modal content increased wavelength-sensitive pixel density, relaxing detector requirements.
Conclusions:
- The proposed method significantly enhances speckle wavemeter resolution and sensitivity.
- Mechanical perturbation of multimode fibers offers a viable path to compact, high-performance wavemeters.
- The technique simplifies detector requirements, making advanced wavemeters more accessible.
