Research on the characteristics of hole-assisted lightguide fiber

Kai Zheng; Deyuan Chang; Yongjun Fu; Shuisheng Jian

doi:10.1117/12.634671

3 December 2005 Research on the characteristics of hole-assisted lightguide fiber

Kai Zheng, Deyuan Chang, Yongjun Fu, Shuisheng Jian

Proceedings Volume 6019, Passive Components and Fiber-based Devices II; 601936 (2005) https://doi.org/10.1117/12.634671
Event: Asia-Pacific Optical Communications, 2005, Shanghai, China

Abstract

Hole-assisted lightguide fiber (HALF) is a microstructured fiber composed of a high index core, a low index cladding and a small number of air holes surrounding the core. The characteristics of HALF are studied by using the full-vector finite element method. The contour lines of power flow intensity and transverse electric distributions are plotted for the fundamental mode and the first four higher order modes. The effect of the structural parameters, such as hole-to-core spacing and relative size of air holes to the cutoff wavelengths of fundamental mode and higher order mode, core power confinement factor, and mode field diameter is analyzed. Due to these holes, there are variations between HALF and conventional step-index fiber. It's found that when the distance between the air holes and core is shorter or the relative size of air holes becomes larger, the effect of air hole on the HALF turns greater: core power confinement factor becomes larger; mode diameter becomes smaller; the cutoff wavelengths of fundamental mode and higher order mode move to shorter wavelength. In terms of waveguide design, the structural parameters of erbium-doped HALF are optimized to obtain high-efficiency operation of a fiber laser or amplifier.

Citation Download Citation

Kai Zheng, Deyuan Chang, Yongjun Fu, and Shuisheng Jian "Research on the characteristics of hole-assisted lightguide fiber", Proc. SPIE 6019, Passive Components and Fiber-based Devices II, 601936 (3 December 2005); https://doi.org/10.1117/12.634671

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KEYWORDS

Waveguides

Cladding

Finite element methods

Step index fibers

Fiber lasers

Refractive index

Dispersion

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