Prof. Ya-Xian Fan Profile

Prof. Ya-Xian Fan

at Harbin Engineering Univ

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Publications (2)

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Proceedings Article | 5 November 2018 Paper

Mode interactions in a three-layered slab waveguide with periodic structures

Aysha Bibi, Ya-Xian Fan, Jiang Nan, Zhi-Yong Tao

Proceedings Volume 10815, 1081517 (2018) https://doi.org/10.1117/12.2500883

KEYWORDS: Waveguides, Refractive index, Waveguide modes, Cladding, Thin films, Dielectrics, Integrated optics, Coating, Wave propagation, Electromagnetism

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We investigate a slab waveguide with periodic structures on the both sides of the core to study the optical mode interaction behaviors in the presence of structure periodicity. As the variation is taking place in both substrate and coating at the same time, the refractive index can be formulated as n_sb(z) = n_cl(z) = n₀(1 + εW(z)), where W(z) = W(z +T) is a periodic function with period T, and ε is a small parameter. Considering a two-dimension mathematical problem, the Maxwell’s equations have been solved by assuming the Bloch modes in transverse direction. Particularly, the E_y component have been solved when the function W(z) is selected as a sine function. The field distributions of both straight and periodic core waveguide have been compared to get a better insight of modes generation. The waveguide mode field in a non-periodic waveguide is centered in the core layer, and exponentially decays outside the core, and the size of the mode field is only related to the lateral distance x. Introducing a variation in the refractive index by a sine function, influences the propagation of modes. The mode field distribution of the core layer remains unchanged, but the pattern field distributions in the cladding layer and the substrate have changed significantly. The TE₀ and TE₁ modes in the cladding and substrate are not continuous and decay gently, but periodically fluctuate along the z-axis. Changing the distribution of the mode field in the periodic structure destroys the orthogonality of the modes and leads to the interaction between a series of modes, referred as resonance.

Proceedings Article | 18 November 2014 Paper

Efficient bending compensation of large mode area fiber

Souaci Farida, Ya-Xian Fan, Li-Bo Yuan

Proceedings Volume 9266, 92661B (2014) https://doi.org/10.1117/12.2073859

KEYWORDS: Distortion, Structured optical fibers, Etching, Cladding, Manufacturing, Refractive index, Numerical simulations, Solids, Optical fibers, Fiber lasers

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While much research has been developed to achieve very large mode areas (LMA) fibers, many difficulties arise, such as bending losses, mode deformation, and high order modes suppression. The main obstacle which remains difficult to confront in LMA fibers is bending distortion. When a conventional LMA fiber is coiled, it will generally suffer large bending distortion, and the mode area will contract accordingly, which would significantly affect laser or amplifier performances for some LMA fibers. In this report, we proposed a simple and efficient way for bending compensation in LMA fiber. A periodically etching structure is proposed to compensate the deformation, bending loss, and mode-coupling effects in large mode area fibers. The numerical simulation results showed that the design not only efficiently improves the effective area, but also the fundamental mode bending loss is resistant. Without the structure, the bending losses are very low at large bending radius. When the bending radius reduces, there is a rapid increase of losses. In particular, for smaller bending radius (less than 20 cm), the fundamental mode deforms severely, and cannot normally transmit in the core. The numerical simulation results showed that the design not only efficiently improves the effective mode area, but also the fundamental mode bending loss is resistant. Even at bending radius as small as 5cm, the fundamental mode can transmit normally in the fiber with an increased mode area scaling. Furthermore, the LMA fiber with the structure can be flexibly manufactured by conventional fiber manufacturing approaches and recent etching technologies.

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