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OAM photon lantern based on spiral tapering optical fiber bundle and manufacturing and application thereof

A technology of tapered optical fibers and fiber bundles, which is applied in the structural field of high-performance OAM mode multiplexing devices, and can solve problems such as very high requirements for tapered precision and difficult implementation

Active Publication Date: 2021-08-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Control the stretching ratio to normalize the frequency of the few-mode ends obtained after tapering, and control the stretching length to keep the phase difference of the LP mode at π / 2, which can realize the multiplexing of the OAM mode, but through the preset stretching ratio Realizing the LP mode phase termination change with the preset stretching length has very high requirements on the accuracy of the taper, which is difficult to achieve in the actual manufacturing process

Method used

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  • OAM photon lantern based on spiral tapering optical fiber bundle and manufacturing and application thereof
  • OAM photon lantern based on spiral tapering optical fiber bundle and manufacturing and application thereof
  • OAM photon lantern based on spiral tapering optical fiber bundle and manufacturing and application thereof

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Embodiment 1

[0034] This embodiment provides a method for arranging optical fiber bundles of OAM photonic lanterns. The photon lantern made by this method can be applied to the generation of OAM mode. The cross-sectional distribution diagram of the optical fiber arrangement provided by the embodiment of the present invention, such as figure 1 As shown, the mode-selective photonic lantern core arrangement of the five LP modes adopts different thickness cores for different LP modes, and uses the same core for the degenerate modes in the same mode group. The fiber core arrangement is symmetrical about the central axis, and the fiber core corresponding to the circularly symmetrical mode is on the axis of symmetry, such as figure 1 Medium LP 01 , and the cores corresponding to the non-circular symmetric modes are symmetrically arranged on both sides of the axis, such as figure 1 Medium LP 11 with LP 21 model. The fiber cores are arranged in concentric circles, and a coreless fluorine-dope...

Embodiment 2

[0040] The OAM photonic lantern multiplexer designed by the present invention all adopts this kind of fiber core arrangement, and the experimental device built for the OAM mode inspection of the output terminal of Example 1 is as follows Figure 5shown. The tunable light source emitted by the tunable laser Tunable Laser is connected to a one-point three-fiber coupler Coupler through a single-mode fiber SMF, which is used to couple the incident light to the output fiber in proportion), and one end is collimated through the coupling lens Len1 and Input to a beam splitter BS (reversely used in this embodiment, two beams of light are combined into one beam of light) is used as the interference reference light to detect the helical phase distribution of OAM, and the other of the one-point three-fiber coupler Coupler The two ends are respectively connected to the OAM photon lantern based on the helical tapered fiber bundle designed by the present invention through two one-to-two cou...

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Abstract

The invention discloses an OAM photon lantern based on a spiral tapering optical fiber bundle, which comprises a conical glass sleeve, an input end positioned on one side of a large head end of the sleeve and an output end positioned on one side of a small head end of the sleeve. An optical fiber bundle of N few-mode optical fibers with different diameters is arranged in the sleeve and surrounds a fluorine-doped low-refractive-index coreless optical fiber. The optical fiber bundle surrounds the coreless optical fiber from the input end to the output end in a spiral tapering manner in a fixed screw pitch and a spiral direction, so that a spiral tapering optical fiber bundle is formed in the sleeve. The output end comprises annular refractive index distribution formed by the optical fiber bundle after spiral tapering, and a ring core optical fiber matched with the output end is welded to the output end. According to the invention, when the photon lantern is drawn, a few-mode optical fiber bundle is utilized to surround a coreless optical fiber to carry out spiral tapering, so that zero-intensity distribution is formed at the center of light intensity at the output end of the photon lantern, meanwhile, the spiral structure generates a phase difference of pi / 2 between different LP modes of the same degenerate module, OAM is formed and multiplexing is carried out, a polarization controller is not needed, and the integration level of the device is improved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication, and in particular relates to the structure and application of a high-performance OAM mode multiplexing device. Background technique [0002] In recent years, the generation and manipulation of light beams carrying optical angular momentum such as spin angular momentum (SAM) and orbital angular momentum (OAM) has attracted increasing attention. A beam with OAM, also known as an optical vortex (OV), whose annular intensity distribution can be used to trap and transport particles. The forces and torques generated by the OAM enable optical vortices to drive micromachines. In astronomy, OAM of light can also be used to increase the contrast value of space telescopes. At the same time, due to the orthogonality between different modes of OAM, using different states of OAM as different channels for transmitting signals can greatly increase the bandwidth of the transmission system. ...

Claims

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Application Information

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IPC IPC(8): G02B6/293G02B6/255
CPCG02B6/29332G02B6/2552G02B6/2553
Inventor 杨志群杨林博张林黄战华侯利洁
Owner TIANJIN UNIV