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A Multiplexer-Demultiplexer Based on Orbital Angular Momentum Light

An orbital angular momentum and demultiplexer technology, which is applied in the field of multiplexers and demultiplexers, can solve the problems of large external influence, inconvenient use, complicated systems, etc., and achieves the effect of convenient use and small total loss

Active Publication Date: 2019-11-05
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the optical geometric transformation needs to be completed by multiple optical devices, so it has the disadvantages of complicated system, great influence from the outside world, and inconvenient use.

Method used

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  • A Multiplexer-Demultiplexer Based on Orbital Angular Momentum Light

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 2

[0019] Embodiment 2: The difference between this embodiment and the optical multiplexer / demultiplexer based on orbital angular momentum described in Embodiment 1 is that the single-mode optical fiber used as input is only arranged in one dimension, that is, the arrangement into m rows by 1 column. The output light at this time corresponds to the orbital angular momentum light with phase change only in the angular direction.

specific Embodiment approach 3

[0020] Embodiment 3: The difference between this embodiment and the optical multiplexer / demultiplexer based on orbital angular momentum described in Embodiment 1 is that this device is used in reverse as a demultiplexer, and the few-mode fiber 3 as the input, and the single-mode fiber 1 as the output. The coaxial orbital angular momentum light transmitted in the few-mode fiber 3 enters the device main body 2 and then enters the phase correction region 2.4. The orbital angular momentum light becomes a rectangular light spot after passing through the phase correction area 2.4, and the phase of the rectangular light spot at this time is disordered. The phase disordered light spot enters the geometric transformation region 2.3 after a short transmission. The phase-chaotic rectangular spot passes through the geometric transformation zone 2.3 and becomes an oblique rectangular plane wave, that is, the intensity of the spot presents a rectangular distribution, while the phase change...

Embodiment approach 4

[0021] Specific implementation method four: the difference between this implementation mode and the optical multiplexer / demultiplexer based on orbital angular momentum described in the third specific implementation mode is that the input orbital angular momentum light has no phase change in the radial direction, and the corresponding The output end of the single-mode fiber is only aligned in one direction.

[0022] The multiplexer in the implementation example of the present invention uses the femtosecond laser heating material to induce a change in the refractive index, and integrates a multiplexing / demultiplexing system into a device, so all the multiplexing and demultiplexing processes are It is completed inside the device, does not accept the disturbance of the air, is less affected by the outside world, and works stably.

[0023] The device of the present invention is a refraction device, and no energy is wasted except for a small amount of scattering and absorption. Ther...

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Abstract

The invention relates to the technical field of optical communication, and particularly relates to an orbital angular momentum light-based multiplexer / demultiplexer. The orbital angular momentum light-based multiplexer / demultiplexer comprises a multiplexer main body, a single-mode optical fiber and a few-mode optical fiber. The single-mode optical fiber is arranged at one end of the multiplexer main body, and the few-mode optical fiber is arranged at the other end of the multiplexer main body. The multiplexer main body is an integrated optical device and comprises a shaping region, a Fourier transformation region, a geometric transformation region and a phase correction region. The shaping region and the geometric transformation region are located on the left side and the right side of theFourier transformation region respectively, and the distance between the shaping region and the geometric transformation region is just equal to one focal length. The orbital angular momentum light-based multiplexer / demultiplexer is simple to manufacture, low in loss, stable in work, and convenient to use. The orbital angular momentum light-based multiplexer / demultiplexer can be widely applied tothe fields of free space optical communication, optical fiber communication, quantum communication and the like.

Description

technical field [0001] The present invention relates to the technical field of optical communication, more specifically, to a multiplexer-demultiplexer based on orbital angular momentum light. Background technique [0002] The vortex light field is a special light field with a spiral wavefront. Due to its unique dynamics, orbital angular momentum and topology, vortex light plays an important role in the fields of optical micromanipulation, optical microscopic imaging, optical communication, quantum information, optical speckle and remote sensing. Research value, especially in the field of expanding optical communication capacity has great potential. [0003] The multiplexing technology based on wavelength division multiplexing is the main means to expand the capacity of optical communication at present. As the existing multiplexing technology is gradually approaching the technical bottleneck, people need a new multiplexing technology compatible with the existing multiplexin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/293
CPCG02B6/2938
Inventor 李朝晖杨继顺肖文达刘志兵熊松松高社成
Owner SUN YAT SEN UNIV