Mode Conversion Characteristics of Ultra-Wideband Fiber Based on Optical Exceptional Point

Ying Liu; Mingyang Chen; Bing Sun

doi:10.3788/AOS240536

Acta Optica Sinica, Volume. 44, Issue 14, 1406004(2024)

Mode Conversion Characteristics of Ultra-Wideband Fiber Based on Optical Exceptional Point

Ying Liu¹, Mingyang Chen², and Bing Sun^1、*

¹College of Electronics and Optical Engineering & College of Flexible Electronics (Future Technology), Nanjing University of Posts and Telecommunications, Nanjing 210023, Jiangsu , China

²School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu , China

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Figures & Tables(7)

$PCF mode conversion scheme based on optical singularity. (a) Cross section; (b) distributions of optical fiber refractive index; (c) fundamental mode (LP01) and higher order mode (LP11) of fiber$

Fig. 1. PCF mode conversion scheme based on optical singularity. (a) Cross section; (b) distributions of optical fiber refractive index; (c) fundamental mode ( $L P_{01}$ ) and higher order mode ( $L P_{11}$ ) of fiber

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$PCF mode conversion scheme. (a) Trajectories of the effective refractive index neff values for LP01 and LP11 modes varying with (γ， τ); (b) normalized intensity profiles under specific parameters$

Fig. 2. PCF mode conversion scheme. (a) Trajectories of the effective refractive index n_eff values for $L P_{01}$ and $L P_{11}$ modes varying with ( $γ$ ， $τ$ ); (b) normalized intensity profiles under specific parameters

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$Quasi-static variations of γ and τ and the length-dependent refractive index distribution. (a) Forming process of EP in the (γ， τ) plane; (b) length-dependent variations (concerning z) of Im (nL) and Im (nR) of the left and right doped refractive index columns$

Fig. 3. Quasi-static variations of $γ$ and $τ$ and the length-dependent refractive index distribution. (a) Forming process of EP in the ( $γ$ ， $τ$ ) plane; (b) length-dependent variations (concerning z) of $I m (n_{L})$ and $I m (n_{R})$ of the left and right doped refractive index columns

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Fig. 4. Processes of mode conversion in the CW direction. (a) Adiabatic conversion from $L P_{01}$ to $L P_{11}$ ; (b) nonadiabatic conversion from $L P_{11}$ to $L P_{11}$

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Fig. 5. Processes of mode conversion in the ACW direction. (a) Nonadiabatic conversion from LP₀₁ to LP₁₁; (b) adiabatic conversion from $L P_{11}$ to $L P_{01}$

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Fig. 6. Variations of mode conversion extinction ratio (ER) varying with parameters in the CW direction. (a) d; (b) D; (c) Λ; (d) γ

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Fig. 7. Mode conversion efficiency varying with wavelength in the CW direction. (a) $L P_{01}$ mode; (b) $L P_{11}$ mode

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Ying Liu, Mingyang Chen, Bing Sun. Mode Conversion Characteristics of Ultra-Wideband Fiber Based on Optical Exceptional Point[J]. Acta Optica Sinica, 2024, 44(14): 1406004

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Paper Information

Category: Fiber Optics and Optical Communications

Received: Jan. 22, 2024

Accepted: Apr. 10, 2024

Published Online: Jul. 4, 2024

The Author Email: Sun Bing (graduate_sunbing@163.com)

DOI:10.3788/AOS240536

CSTR:32393.14.AOS240536

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology