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Function of second cladding layer in hollow core tube lattice fibers
Xiaosheng Huang1, Seongwoo Yoo2, KenTye Yong1
1The Photonics Institute, School of Electrical and Electronics Engineering, Nanyang Technological University, Singapore, 639798, Singapore.
Scientific Reports
|May 11, 2017
Summary
Adding a second cladding layer to tube lattice fibers (TLF) reduces mode attenuation and improves bending performance, enabling low-loss, small-core designs for gas-filled applications.
Area of Science:
- Optical Fiber Technology
- Photonics
- Materials Science
Background:
- Tube lattice fibers (TLF) typically require large core diameters (D) to minimize mode attenuation (loss) relative to wavelength (λ).
- Small core diameters are desirable for gas-filled TLF applications but increase mode attenuation.
- Conventional single-layer cladding TLF (1TLF) presents a trade-off between core size and attenuation/application suitability.
Purpose of the Study:
- To investigate the impact of a second cladding layer on TLF mode attenuation and bending performance.
- To resolve the conflicting requirements of low loss and small core size in TLF.
- To demonstrate the advantages of a two-layer cladding TLF (2TLF) over 1TLF.
Main Methods:
- Theoretical modeling of mode attenuation and confinement loss in 1TLF and 2TLF structures.
- Experimental validation of theoretical predictions.
- Analysis of the influence of core diameter (D) and wavelength (λ) on attenuation.
Main Results:
- The two-layer cladding TLF (2TLF) exhibits significantly less sensitivity to the D/λ ratio compared to 1TLF.
- 2TLF enables the realization of low-loss, small-core fibers.
- The second cladding layer effectively alleviates the conflict between bending loss and confinement loss in small-core TLF.
Conclusions:
- A second cladding layer is crucial for optimizing TLF performance, offering reduced mode attenuation and enhanced bending characteristics.
- 2TLF overcomes the limitations of 1TLF, facilitating advanced applications requiring small-core, low-loss fibers.
- The role of the second cladding ring in TLF design has been significantly underestimated in previous research.
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