Photonic crystal T-shaped waveguide-based horizontal output magnetic control alternative light path switch

A technology of photonic crystal and optical path switch, which is applied in the field of horizontal output magnetically controlled two-to-one optical path gating switch, which can solve the problems of large size and inability to integrate optical paths, and achieve small structure size, wide operating wavelength range, and switching time response fast effect

Inactive Publication Date: 2016-05-25

欧阳征标

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AI-Extracted Technical Summary

Problems solved by technology

[0002] The traditional magnetically controlled two-select-one optical path gating switch applies the princ...

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Abstract

The invention discloses a photonic crystal T-shaped waveguide-based horizontal output magnetic control alternative light path switch which comprises a photonic crystal T-shaped waveguide with a TE forbidden band. The light path switch further comprises an input end (1), two output ends (2, 3), a background silicon dielectric cylinder (4), isosceles right triangle defect dielectric cylinders (5), a defect dielectric cylinder (6) and an electromagnet (7) for supplying offset magnetic field, wherein the input end (1) is arranged at the left end of the photonic crystal T-shaped waveguide; the output ends (2, 3) are respectively located at the right end and upper end of the photonic crystal T-shaped waveguide and are arranged in a horizontal line; the defect dielectric cylinder (6) is located at a central interaction of the T-shaped waveguide; the photonic crystal T-shaped waveguide is used for inputting the TE carrier light through the port (1) and then outputting the amplitude modulating light from the port (2) or the port (3). The photonic crystal T-shaped waveguide-based horizontal output magnetic control alternative light path switch is small in structure volume, is convenient in integration and is capable of efficiently realizing the function of alternative light path switch.

Application Domain

Optical light guidesNon-linear optics

Technology Topic

Optical pathRight triangle +10

Image

Examples

Experimental program(3)

Example Embodiment

[0073] Example 1

[0074] In this embodiment, without considering the dispersion or the material dispersion change is small, by changing the lattice constant in proportion, the function of the optical path gating switch of different wavelengths can be realized by the magnetron. Let the parameter a=6.1772×10 -3 [m], d 2 = 0.3a, d 3 = 0.2817a, d 5 =1.2997a, μ=9.6125, p=0.7792, normalized light wave frequency ωa/2πc=0.4121, other parameters remain unchanged, making it correspond to 20GHz light wave. Referring to Figure 5(a), the switch contrast map in the forbidden band lightwave frequency range is obtained through simulation calculation, and referring to Figure 5(b), the switch isolation map in the forbidden band lightwave frequency range, the structure has high contrast and high The magnetron with isolation degree can choose one optical path strobe switch, thus realizing the optical switch function.

Example Embodiment

[0075] Example 2

[0076] In this embodiment, regardless of the dispersion or the small change of the material dispersion, the function of the optical path gating switch of different wavelengths can be realized by changing the lattice constant in an equal proportion. Let the parameter a=4.1181×10 -3 [m], d 2 = 0.3a, d 3 = 0.2817a, d 5 =1.2997a, μ=9.6125, p=0.7792, normalized light wave frequency ωa/2πc=0.4121, other parameters remain unchanged, making it correspond to 30GHz light wave. Referring to Figure 6(a), the switching contrast in the forbidden band lightwave frequency range is obtained by simulation calculation; referring to Figure 6(b), the switching isolation in the forbidden band lightwave frequency range, the structure has high contrast and high isolation The magnetron selects one optical path strobe switch to realize the optical switch function.

Example Embodiment

[0077] Example 3

[0078] In this embodiment, regardless of the dispersion or the small change of the material dispersion, the function of the optical path gating switch of different wavelengths can be realized by changing the lattice constant in an equal proportion. Let the parameter a=3.0886×10 -3 [m], d 2 = 0.3a, d 3 = 0.2817a, d 5 =1.2997a, μ=9.6125, p=0.7792, normalized light wave frequency ωa/2πc=0.4121, other parameters remain unchanged, making it correspond to 40GHz light wave. Referring to Fig. 7(a), the switch contrast in the band gap frequency range is obtained by simulation calculation; refer to Fig. 7(b), the switch isolation diagram in the band gap frequency range. It can be seen from Figure 7(a) and Figure 7(b) that when the normalized light wave frequency ωa/2πc = 0.4121, the finite element software COMSOL calculates the light field simulation diagram, such as Picture 8 Shown. It can be seen that TE light is efficiently propagated to port 2 and port 3, respectively. This structure has a high-contrast, high-isolation, magnetically controlled one-of-two optical path gating switch, thereby realizing the optical switch function.

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Description & Claims & Application Information

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