Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Design of a Polarization Splitter Based on a Dual-core Hexagonal-shaped Photonic Crystal Fiber

  • Received : 2018.12.21
  • Accepted : 2019.05.31
  • Published : 2019.08.25
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Abstract

In this paper, a microstructured, hexagonal-shaped dual-core photonic crystal fiber (PCF) is proposed. The proposed structure has specific optical properties to obtain high birefringence and short coupling length, for different values of structural parameters varied over a wide range of wavelength. The properties are analyzed using a solid core of silica material. The proposed structure is implemented as a polarization splitter with splitting length of 1.9 mm and a splitting ratio of -34.988 dB, at a wavelength of 1550 nm. The obtained bandwidth in one band gap of about 81 nm. The numerical analysis ensures that the performance of the proposed polarization splitter is better than that of existing ones.

Keywords

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FIG. 1. Photonic crystal structure.

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FIG. 2. Dual-core hexagonal-shaped photonic crystal fiber.

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FIG. 3. Simulated structure of dual core hexagonal-shaped PCF: (a) x-polarized (even mode), (b) y-polarized (even mode), (c) x- polarized (odd mode), (d) y-polarized (odd mode).

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FIG. 4. Modal effective indices of the two polarized fundamental modes and band-gap map, as a function of wavelength.

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FIG. 5. Effective index varying with wavelength, for different d/D ratios.

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FIG. 6. Birefringence variying with wavelength, for different d and constant D values.

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FIG. 7. Coupling length for x-polarized light, changing with wavelength.

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FIG. 8. Coupling length for y-polarized light, changing with wavelength.

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FIG. 9. Normalized power transmission of x-polarized light in cores C1 and core C2 at 1550 nm.

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FIG. 10. Normalized power transmission of y-polarized light in cores C1 and core C2 at 1550 nm.

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FIG. 11. Normalized power transmission of x- and y-polarized light in core C1 at 1550 nm.

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FIG. 12. Normalized power transmission of x- and y-polarized light in core C2 at 1550 nm.

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FIG. 13. Extinction ratio of 1.9 mm fiber length versus wavelength, in core C1.

TABLE 1. Effective index for different d/D at 1.55 μm

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TABLE 2. Birefringence for different d/D at 1.55 μm

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TABLE 3. x-polarized and y-polarized light coupling length at 1.55 μm

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TABLE 4. Comparison of conventional splitters with proposed polarization splitter

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