Research on fabrication of helical-core fiber based on the coordinates of the centroid

Tao Geng; Renfeng Xue; Wenlei Yang; Shixin Geng; Zhaojun Liu; Tian Ye

doi:10.1117/12.2070231

18 September 2014 Research on fabrication of helical-core fiber based on the coordinates of the centroid

Tao Geng, Renfeng Xue, Wenlei Yang, Shixin Geng, Zhaojun Liu, Tian Ye

Proceedings Volume 9282, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 928229 (2014) https://doi.org/10.1117/12.2070231
Event: 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2014), 2014, Harbin, China

Abstract

Helical core optical fiber is used to achieve high power fiber laser output and polarization state control, and it has become a hot issue of current research due to its unique characteristics of chiral medium. The key difficult point is critical concentric alignment between the actual rotational center and the optical fiber core in helical core fiber manufacturing process. This paper proposed a new alignment method based on the coordinates of centroid. That is, injecting light to the main and sub fiber core which is fixed on the rotating clamping apparatus, acquiring two coordinates of the energy center in output field spot image with the help of the microscopic imaging system by using the squared weighted centroid method. X-axis is defined as the two fiber core connection direction, which perpendicular direction is Y-axis, and the origin is the center of main fiber core, so the correspondence between the main fiber core XY coordinate system and the rotating clamping apparatus X₀Y₀ coordinate system is available. Main fiber core rotation center coordinates X'Y' can be obtained by fitting, and the X₀Y₀ adjustment of clamping apparatus can be also acquired by coordinate transformation. Experimentally measured eccentricity error can be controlled around 8μm, which achieved concentricity precise adjustment. The experimental device has advantages of small size, stable performance, high positioning accuracy, and this method overcomes the key technical difficulties of the helical core optical fiber preparation.

Citation Download Citation

Tao Geng, Renfeng Xue, Wenlei Yang, Shixin Geng, Zhaojun Liu, and Tian Ye "Research on fabrication of helical-core fiber based on the coordinates of the centroid", Proc. SPIE 9282, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 928229 (18 September 2014); https://doi.org/10.1117/12.2070231

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KEYWORDS

Optical fibers

Imaging systems

Optical alignment

Optics manufacturing

Carbon dioxide lasers

Polarization

Fiber lasers

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