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A kind of optical fiber coupler based on linear polarization and its manufacture and use method

A fiber coupler, linear polarization technology, applied in the coupling of optical waveguides, instruments, optics, etc., can solve the problems of increasing the complexity of the optical system, and achieve the effect of reducing complexity, small size structure, and small insertion loss

Active Publication Date: 2020-07-28
WUHAN POST & TELECOMM RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of multiple couplers increases the complexity of the optical system

Method used

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  • A kind of optical fiber coupler based on linear polarization and its manufacture and use method
  • A kind of optical fiber coupler based on linear polarization and its manufacture and use method
  • A kind of optical fiber coupler based on linear polarization and its manufacture and use method

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Embodiment 1

[0035] see figure 1 As shown, the embodiment of the present invention provides a fiber coupler based on linear polarization, which is used to convert incident light into other fiber modes. The fiber coupler is made of metasurface materials, 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 .

[0036] The silicon nanorods 3 of different silicon nanorod units 2 are cuboids with different structural parameters. When the incident light is vertically incident, the light with the polarization direction along the long and shor...

Embodiment 2

[0053] see Figure 1-2 As shown, the embodiment of the present invention provides a method for manufacturing a fiber coupler based on linear polarization, which is characterized in that it includes the following steps:

[0054] S1: Determine the working wavelength as 1550nm, in order to convert the incident horizontal linearly polarized light into LP 11a mode, the incident vertically linearly polarized light is converted to LP 11b mode, it was determined that four different silicon nanorod units were required, see image 3As 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. For vertical linearly polarized incident light, the A, B, C and D regions produce The phase delays of are 0, π, π, 0 respectively; for the horizontal linearly polarized incident light, the phase delays generated by the A, B, C and D regions are 0, 0, π, π respectively.

[0055] The phase delay of silicon nanorods in each si...

Embodiment 3

[0060] see Figure 5 with Image 6 As shown, the embodiment of the present invention also provides a method for using the above optical fiber coupler, including the following steps:

[0061] S1: Combine the modulated horizontal linearly polarized light and vertical linearly polarized light through the beam combiner 4, and the combined light is vertically incident on the silicon nanorod array of the first optical fiber coupler 5 to form LPs respectively 11a Mode and LP 11b mode of the higher-order mode, resulting in an LP 11a and LP 11b The normalized electric field intensity distribution of the mode is as Figure 4 shown;

[0062] S2: Different high-order modes are coupled into a few-mode fiber or a multi-mode fiber through a 4f system composed of a collimating lens 6 and a focusing lens 7 to realize fiber mode multiplexing;

[0063] S3: Two high-order modes propagating for a certain distance in the few-mode fiber or multi-mode fiber are incident on the silicon nanorod a...

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Abstract

The invention discloses a linear polarization based fiber coupler and a manufacture method and usage thereof, relating to fields of micronano optics and polarization optics. The fiber coupler comprises a substrate and a silicon nano rod array, wherein the silicon nano rod array comprises multiple silicon nano rod units etched on the substrate, silicon nano rods in the same silicon nano rod unit have identical structural parameters, silicon nano rods of different silicon nano rod units are cuboids with different structural parameters, if incident light enters vertically, light with polarizationdirections along a long edge and a short edge of the silicon nano rod is reflected and projected, length, width and height of the silicon nano rod are configured to that phase delay of the silicon nano rod units is equal to phase distribution of a fiber mode after light conversion. The fiber coupler is small, has low insertion loss, is accurate in phase regulation, can switch two different kindsof linear polarization light of incident light to two different fiber modes, and makes optical devices less complex.

Description

technical field [0001] The invention relates to the fields of micro-nano optics and polarization optics, in particular to a linear 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 d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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