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Coupling light from laser to NANF with a hyperbolic profile fiber microlens
Optics Express
|June 11, 2026
Summary
A novel hyperbolic microlens improves fiber optic connections by boosting coupling efficiency by 9 dB. This fiber optic coupling method reduces reflections and maintains a working distance without anti-reflective coatings.
Area of Science:
- Optics and Photonics
- Fiber Optic Communications
- Micro-optics
Background:
- Efficient interconnection between laser diodes (LDs) and hollow-core fibers (HCFs) is crucial for optical systems.
- Traditional butt-coupling methods suffer from low coupling efficiency and significant Fresnel reflections.
- Mode-field mismatch between LDs and HCFs limits performance.
Purpose of the Study:
- To present a mode-field adaptation technique for HCF-LD interconnections.
- To enhance coupling efficiency and reduce optical return loss.
- To develop a compact and practical solution for fiber optic integration.
Main Methods:
- Designed and implemented a microlens with a hyperbolic profile.
- Integrated the microlens at the interface between the HCF and LD.
- Characterized the coupling efficiency and return loss of the proposed configuration.
Main Results:
- Achieved a 9 dB enhancement in coupling efficiency compared to butt-coupling.
- Mitigated Fresnel reflections, resulting in return loss (RL) greater than 50 dB.
- Maintained a flexible working distance exceeding 30 µm.
Conclusions:
- The hyperbolic microlens effectively adapts the mode field for improved HCF-LD interconnection.
- The proposed solution offers high coupling efficiency and excellent return loss without anti-reflective coatings.
- The compact design is suitable for practical integration into optical systems.
