Asymmetric planar optical waveguide mode multiplexing/demultiplexing device based on few-mode fibers

A planar optical waveguide and few-mode optical fiber technology, applied in the field of communication, can solve problems such as difficult productization, large insertion loss, and difficult interconnection

Active Publication Date: 2013-10-09
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing mode multiplexers are mostly used in the laboratory environment for mode multiplexing and demultiplexing of the mode multiplexing communication experimental system, and their characteristics

Method used

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  • Asymmetric planar optical waveguide mode multiplexing/demultiplexing device based on few-mode fibers
  • Asymmetric planar optical waveguide mode multiplexing/demultiplexing device based on few-mode fibers
  • Asymmetric planar optical waveguide mode multiplexing/demultiplexing device based on few-mode fibers

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Experimental program
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Effect test

Embodiment 1

[0053] Embodiment 1: When a single mode is input to the fundamental mode, the fundamental mode is transmitted in the waveguide.

[0054] In this embodiment, the light input into the waveguide is controlled at the input end of the waveguide, and only the fundamental mode is selected in the incident light. Schematic diagram of the flow process of field energy in the waveguide when the fundamental mode is injected into the main arm A of the waveguide, as shown in image 3 shown. It can be clearly seen from the figure that after the fundamental mode enters the main arm, it is transmitted forward. When it is transmitted to the bifurcation, the power of the fundamental mode in the branch arm 1 remains basically unchanged, and most of the energy in the light wave travels along the branch arm. 1 spread. The power of the fundamental mode in branch arm 2 drops rapidly from the bifurcation, reaches the lowest value when it reaches about 600 μm, and remains stable until the end. The ou...

Embodiment 2

[0057] Embodiment 2: When a single mode is input to a first-order mode, the first-order mode is transmitted in the waveguide.

[0058] The light input into the waveguide is controlled at the input end of the waveguide, and the fundamental mode is converted into a first-order mode through mode conversion, and then it is incident into the main arm A of the waveguide. Schematic diagram of the flow process of field energy in the waveguide when the first-order mode is injected into the main arm A of the waveguide, as shown in Figure 6 shown. It can be seen from the figure that after the first-order mode enters the waveguide, it is normally transmitted within the range of the main arm, but after passing through the branch point, the energy of the first-order mode flows to the branch arm 2, and is converted into the fundamental wave during the transmission process of the branch arm 2. mode, the power of the fundamental mode in branch arm 2 increases gradually, and basically reaches...

Embodiment 3

[0062] Embodiment 3: When the fundamental mode and the first-order mode are input at the same time, the fundamental mode and the first-order mode are transmitted in the waveguide.

[0063] When the fundamental mode and the first-order mode are simultaneously injected into the main arm A of the waveguide, the propagation of the optical mode in the waveguide at this time is observed. Since the effective refractive index of the fundamental mode in waveguide A is similar to the effective refractive index of the fundamental mode in branch arm 1, the fundamental mode is output along branch arm 1 after matching; the effective refractive index of the first-order mode in waveguide A is the same as that of the fundamental mode in branch arm 2 Approximate, so after matching, the first-order mode is converted to the fundamental form and output along branch arm 2.

[0064] When the fundamental mode and the first-order mode are injected into the main arm A of the waveguide at the same time,...

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Abstract

The invention belongs to the technical field of communication, relates to an asymmetric planar optical waveguide mode multiplexing/demultiplexing device based on few-mode fibers, in particular to a planar optical waveguide mode multiplexing/demultiplexing device which is used for mode diversity multiplexing communication and facilitates interconnection. The device is of a Y-shaped structure and composed of a waveguide main arm and a plurality of waveguide branch arms, wherein the number of the waveguide branch arms is same as the number of transmission modes of the few-mode fibers; the waveguide main arm and the waveguide branch arms are respectively composed of a core layer and a cladding, and the refraction index of the core layers of each of the waveguide main arm and the waveguide branch arms and the refraction index of the cladding of each of the waveguide main arm and the waveguide branch arms are same as the refraction index of a fiber core of each few-mode fiber and the refraction index of a cladding of each few-mode fiber respectively. The asymmetric planar optical waveguide mode multiplexing/demultiplexing device is simple in structure, low in loss, easy to integrate, stable in performance, wide in broadband, simple and efficient.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a planar optical waveguide mode multiplexer / demultiplexer for mode diversity multiplex communication which is convenient for interconnection. Background technique [0002] With the continuous increase of bandwidth-consuming services such as Internet services, Internet of Things, IPTV, and new-generation large-scale data centers using cloud computing, the demand for network bandwidth has reached an unprecedented height. Due to the huge pressure brought by the optical transport network, people use various methods to improve the existing optical transmission capacity. However, due to the limitation of the inherent nonlinear effect of the single-mode fiber itself, the foreseeable "bandwidth exhaustion" may be reached in the near future. Therefore, seeking an optical transmission technology that can fundamentally solve the "bandwidth limit" of the single-mode fiber ...

Claims

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Application Information

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IPC IPC(8): G02B6/293G02B6/12
Inventor 胡贵军肖健柏松杜洋石健
Owner JILIN UNIV
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