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Coherent modal engineering: a perspective on fiber splice optimization
Optics Express
|May 4, 2026
Summary
Optimizing fiber splices involves a novel coherent modal engineering approach. This method prioritizes modal coherence by deliberately exciting and controlling higher-order modes for destructive interference, challenging traditional assumptions.
Area of Science:
- Optical Engineering
- Fiber Optics
- Photonics
Background:
- Single-mode to multimode fiber splices are crucial components in optical systems.
- Traditional splice optimization assumes matched mode field diameters for efficiency.
- Higher-order mode excitation during splicing can degrade signal quality.
Purpose of the Study:
- To introduce a coherent modal engineering approach for optimizing single-mode to multimode doped fiber splices.
- To investigate the impact of splicing parameters on higher-order mode excitation.
- To challenge the conventional assumption of matched mode field diameters.
Main Methods:
- Systematic variation of arc duration during splicing.
- Analysis of higher-order mode excitation using the S2 technique.
- Measurement of thermally diffused refractive index profiles.
Main Results:
- Optimal splicing conditions do not rely on matched mode field diameters.
- A non-adiabatic index transition in the multimode fiber excites higher-order modes (LP02).
- Deliberate mode-field-diameter mismatch excites LP02 modes for controlled destructive interference.
Conclusions:
- A new paradigm for splice optimization prioritizes modal coherence and beating.
- Controlled excitation and interference of higher-order modes enhance splice performance.
- The approach moves beyond simple geometric matching for improved fiber optic connections.
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