Design method for transverse electric/ transverse magnetic (TE/TM) mode separator based on photonic crystal imperfect tape

A technology of photonic crystals and design methods, applied in instruments, light guides, optics, etc., can solve the problems of difficult process, difficult to manufacture, and many polarization crosstalks, and achieve the effect of simple process and low cost

Inactive Publication Date: 2012-11-14
EAST CHINA NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The first type is the cross-type, which is characterized by a cross-shaped active area, a relatively simple structure, and low process difficulty, but there are many factors that affect polarization crosstalk, so it is difficult to optimize the structural parameters
The second type is the Y-junction type, which is divided into two types with gap and without gap. It is characterized in that there is only one input port and two output ports. The process is not difficult, but the polarization crosstalk is often large.
The third type is the directional coupler type. This type of device is designed according to the principle of inter-mode coupling, which can achieve very low polarization crosstalk, but the process is difficult and difficult to manufacture.
However, in all these works, they did not try to use the defect bands in the coupled microcavity waveguides to construct TE / TM mode separators, but to use the different wave localization effects of the defect bands to construct TE / TM mode splitters would be show meaningful work

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  • Design method for transverse electric/ transverse magnetic (TE/TM) mode separator based on photonic crystal imperfect tape
  • Design method for transverse electric/ transverse magnetic (TE/TM) mode separator based on photonic crystal imperfect tape
  • Design method for transverse electric/ transverse magnetic (TE/TM) mode separator based on photonic crystal imperfect tape

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Embodiment 1

[0025] In order to illustrate the design method of the TE / TM mode splitter, we first take a one-dimensional photonic crystal as an example to illustrate our design process. Such as figure 1 As shown, this one-dimensional photonic crystal is composed of dielectric materials with a dielectric constant of 1 (air) and 13 (such as silicon), and their normalized thickness is 0.5. In it, N defect layers are introduced periodically to form a coupled microcavity waveguide structure, the dielectric constant of the defect layer can be changed between 1 and 13, and the normalized thickness can also be changed between 0.1 and 0.9.

[0026] Here we first choose one situation for detailed discussion, for example, we choose the dielectric constant of the defect layer to be 6, its normalized thickness is 0.5, and the number of defect layers is N=10. It can be obtained from the previous calculation that these defect states will form defect bands in the band gap of the photonic crystal. In ord...

Embodiment 2

[0028] To illustrate the influence of the parameters of the defect layer on the TE / TM mode separator in more detail, we discuss the properties of different defect layers in detail: when the dielectric constant of the defect layer is 1, similar to the previous discussion process, the coupling can be obtained The minimum splitting angle of the TE / TM defect band of the microcavity waveguide is 17.4. When the dielectric constant of the defect layer is 13, the minimum splitting angle of the TE / TM defect bands of the coupled microcavity waveguide is 8.4. In short, a defect layer with a low dielectric constant requires a larger incident angle to split the TE / TM defect bands. This is due to the fact that the defect layer with a low dielectric constant has poor localization to the electromagnetic field, so that the localization of the electromagnetic field in the TE mode also decreases with the increase of the incident angle, so the defects of the TE and TM modes have the same For exa...

Embodiment 3

[0030]In order to discuss the application of TE / TM mode separators based on photonic crystal defect bands more completely and its special band separation effect, we have studied its physical characteristics in detail, and believe that the defect layer spacing has a great influence on this result, which can be The transmission of the flat-band structure is realized by adjusting the period number n between defective layers. Such as Figure 8 Shown is the photonic crystal coupled waveguide transmission spectrum with the number of defect interlayer cycles n equal to 9, 10 and 11 respectively. It can be found that the defect interlayer cycle number n=10 will have a wide flat band result, which can realize broadband transmission, which will be in It plays an important role in broadband TE / TM mode separators. In order to be practical, we have designed a TE / TM mode separator based on the wavelength of 1550nm in the optical communication band, such as Figure 9 As shown, the electrom...

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Abstract

The invention discloses a design method for a transverse electric / transverse magnetic (TE / TM) mode separator based on a photonic crystal imperfect tape. A coupling microcavity wave guiding structure is formed by leading in defect states in a photonic crystal structure periodically, and separation of the TE / TM mode is achieved by controlling the incidence angle of electromagnetic wave. The coupling microcavity wave guiding structure is formed by leading in defect states in the photonic crystal structure periodically, and due to different locality effect of the TE mode and the TM mode in the imperfect tape, waves of the TE mode and the TM mode can be separated under proper incidence angles, the division angle reduces along with increasing of the dielectric constant of the imperfect tape, the division of the two modes can be achieved under the circumference that the incidence angle of the electromagnetic wave is smaller than or equal to 10 degrees, and the design method is suitable for manufacture of the TE / TM mode separator. The design method has large potential application value in the field of physical electronics, optics, materials science, micromotor systems and the like.

Description

technical field [0001] The present invention relates to a design method of a novel transverse electric field (TE) / transverse magnetic field (TM) mode separator, especially a design method of a TE / TM mode separator based on photonic crystal defect bands. The mode separator The method is to construct a photonic crystal structure by periodically introducing defect states, and to design a TE / TM mode separator by using the characteristics of TE and TM defect bands changing with the incident angle of electromagnetic waves, which belongs to the technical field of optical device systems and optical communication systems. Background technique [0002] The TE / TM mode separator is an essential part of the polarization-independent wavelength filter in coherent light measurement and optical fiber communication system wavelength division multiplexing technology. Its successful development is for the measurement of coherent light, especially for improving optical fiber communication The ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/126G02B6/10
Inventor 徐少辉王连卫
Owner EAST CHINA NORMAL UNIV
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