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Optical fiber coupler based on circular polarization, and manufacturing and use methods thereof

A technology of optical fiber coupler and manufacturing method, which is applied in the coupling of optical waveguide, light guide, optics, etc., can solve the problems of single function and increase the complexity of optical system, and achieve the effects of simple preparation, reduced complexity, and small insertion loss

Active Publication Date: 2018-12-18
WUHAN POST & TELECOMM RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing fiber mode couplers all have the defect of single function, and fiber couplers using these technologies can only convert the optical signal in a single-mode fiber into a mode in a multimode fiber
If three higher-order modes are used in the mode division multiplexing system, three different fiber couplers need to be used, and the use of multiple couplers increases the complexity of the optical system

Method used

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  • Optical fiber coupler based on circular polarization, and manufacturing and use methods thereof
  • Optical fiber coupler based on circular polarization, and manufacturing and use methods thereof
  • Optical fiber coupler based on circular polarization, and manufacturing and use methods thereof

Examples

Experimental program
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Embodiment 1

[0033] see figure 1 As shown, the embodiment of the present invention provides a fiber coupler based on circular polarization. The fiber coupler is made of a metasurface material, including a substrate 1 and a silicon nanorod array. The silicon nanorod array is formed by a plurality of silicon nanorod units 2 etched on the substrate 1. The structural parameters of the silicon nanorods 3 in the same silicon nanorod unit 2 are the same, and the silicon nanorod units 2 in different silicon nanorod units 2 are arranged. The structural parameters of the nanorods 3 are different, that is, the silicon nanorod units 2 are divided according to the structural parameters of the silicon nanorods 3 .

[0034] Different silicon nanorod units 2 are arranged on the corresponding substrate 1 with different rotation angles α(i, j), and the rotation angle is the angle between the long axis of the silicon nanorod 3 and the x-axis in the coordinate system xoy of the working surface, and satisfies ...

Embodiment 2

[0051] see Figure 1-2 As shown, the embodiment of the present invention provides a method for manufacturing a fiber coupler based on circular polarization, including the following steps:

[0052] S1: Make sure the working wavelength is 1550nm, in order to convert the incident left-handed circularly polarized light into LP 11amode, the incident right-handed circularly polarized light is converted to LP 11b mode, it was determined that four different silicon nanorod units were required, see image 3 As shown, the silicon nanorod array is divided into four silicon nanorod units, which are marked as A, B, C and D units in the figure, and for the left-handed circularly polarized incident light, the A, B, C and D regions produce The phase delays of are 0, π, π, 0, respectively; for the right-handed circularly polarized incident light, the phase delays generated by regions A, B, C, and D are 0, 0, π, π, respectively.

[0053] The rotation angle α(i, j) of different silicon nanoro...

Embodiment 3

[0058] The embodiment of the present invention also provides a method for using the above optical fiber coupler, including the following steps:

[0059] S1: Combine the modulated left-handed circularly polarized light and right-handed circularly polarized light through the beam combiner 4, and the combined light is vertically incident on a fiber coupler 5 to form LP respectively 11a mode and the higher-order modes of the LP11b mode, the resulting LP 11a and LP 11b The normalized electric field intensity distribution of the mode is as Figure 4 shown;

[0060] S2: Different high-order modes are coupled into a few-mode fiber or a multi-mode fiber through a 4f system composed of a collimator lens 6 and a focusing lens 7 to realize fiber mode multiplexing, see Figure 5 shown.

[0061] S3: Two high-order modes propagating for a certain distance in a few-mode fiber or a multi-mode fiber are incident on the silicon nanorod array of another fiber coupler to form left-handed polar...

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Abstract

The invention discloses an optical fiber coupler based on circular polarization, and manufacturing and use methods thereof, and relates to the field of micro-nano optics and polarization optics. The optical fiber coupler comprises a substrate and a silicon nanorod array; the silicon nanorod array is formed by arranging a plurality of silicon nanorod units etched on the substrate; the structure parameters of silicon nanorods in the same silicon nanorod units are the same, and the structure parameters of silicon nanorods in different silicon nanorod units are different; and the different siliconnanorod units are arranged on the corresponding substrate at different turning angles alpha, wherein the turning angles are included angles between the long axes of the silicon nanorods and the x axis in a working face coordinate system xoy. The optical fiber coupler provided by the invention has a relatively small size structure, and is small in insertion loss and accurate in phase adjustment; and two types of different circular polarized light in incident light can be converted into two different optical fiber modes, so that the complexity of an optical device is lowered.

Description

technical field [0001] The invention relates to the fields of micro-nano optics and polarization optics, in particular to a circular polarization-based optical fiber coupler and a method for manufacturing and using the same. Background technique [0002] As the transmission capacity of single-mode optical fiber is approaching the limit, mode-division multiplexing optical fiber transmission systems using few-mode optical fibers or multi-mode optical fibers are being used more and more. Among them, the fiber coupler is an important optical device in the system, and its function is to convert the fundamental mode optical signal in the single-mode fiber into a higher-order mode, and couple it to a few-mode fiber or a multi-mode fiber for transmission. [0003] Commonly used optical fiber mode conversion is mostly realized by phase plate, photonic integrated waveguide, optical fiber bundle and three-dimensional optical waveguide. Existing optical fiber mode couplers all have the...

Claims

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Application Information

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IPC IPC(8): G02B6/27
CPCG02B6/2706G02B6/2766G02B6/2773
Inventor 武霖陶金郑国兴邱英刘子晨尤全
Owner WUHAN POST & TELECOMM RES INST CO LTD
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