Optical fiber mode add-drop multiplexer

An add-drop multiplexer and mode technology, which is applied in the direction of cladding fiber, optical waveguide light guide, optical waveguide coupling, etc., can solve the problem that the dual-core coupler cannot realize the separation mode, it is difficult to avoid the coupling of different modes, and the mode field is seriously deformed. and other problems, to achieve the effect of low crosstalk coupling, increasing the coupling length difference, and increasing the effect

Inactive Publication Date: 2014-04-02
JIANGSU UNIV
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Problems solved by technology

However, for cases where more than two modes are transmitted, dual-core couplers cannot achieve selective mode separation
The dual-core fiber based on the coupling of single-mode fiber and few-mode fiber can also be used as a mode splitter, but it is difficult to avoid the coupling between different modes【Opt. Fiber Technol.,2011, 17(5 ): 490-494】
The multiplexing and separation of multiple modes can be realized by using multi-core optical fiber. The di...

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  • Optical fiber mode add-drop multiplexer
  • Optical fiber mode add-drop multiplexer
  • Optical fiber mode add-drop multiplexer

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Embodiment 1

[0033] This embodiment realizes LP 11 Die and LP 01 Die, LP 02 Die, LP 21 Separation between modules. Fiber structure such as figure 1 shown. The fiber matrix material 1 is pure silica, the radius of the main core is 5.5 μm, and the refractive index difference between the core and the cladding is 0.015. The radius of the auxiliary core is 1.95 μm, and the refractive index difference between the core and the cladding is 0.021. The center distance between the main core and adjacent auxiliary cores is 10.5 μm, and the distance between adjacent auxiliary cores is 7.5 μm. The fiber length is taken as 4.5 mm. When light is input from the left main core, LP can be achieved 11 One mode exits the right main core, while the other modes exit the left main core. Its coupling length curve is as image 3 (a) shown. The energy of different modes output by the fiber core such as Figure 4 shown. due to LP 01 Die and LP 02 The effective refractive index of the mode is very diff...

Embodiment 2

[0036] This embodiment realizes LP 02 Die and LP 01 Die, LP 11 Die, LP 02 Die, LP 21 Separation between modules. Fiber structure such as Figure 5 shown. The optical fiber matrix material 1 is pure silica, the radius of the main core is 6.15 μm, and the refractive index difference between the core and the cladding is 0.012. The radius of the auxiliary core is 1.25 μm, and the refractive index difference between the core and the cladding is 0.018. The center distance between the main core and adjacent auxiliary cores is 11.9 μm, and the distance between adjacent auxiliary cores is 7 μm. The fiber length is taken as 3.48 mm. LP can be achieved when light is input from the left core 02 Modes are output from the right core, and other modes are output from the left core. The energy of different modes output by the right core is as follows: Figure 6 shown. due to LP 01 Die and LP 02 The effective refractive index of the mode is very different, the main core is far awa...

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Abstract

The invention discloses an optical fiber mode add-drop multiplexer. The add-drop multiplexer is a multi-core optical fiber; optical fiber cores comprise two main body optical fiber cores and a plurality of auxiliary optical fiber cores, wherein the connecting line of the centers of all the optical fiber cores is a straight line; the auxiliary optical fiber cores are positioned between the two main body optical fiber cores; the center distances of two adjacent auxiliary optical fiber cores are the same; the auxiliary optical fiber cores are single-mode optical fibers. A plurality of multiplexing modes to be separated are input from one main body optical fiber core, one mode is output from the other main body optical fiber core, and the other modes are still output from the original main body optical fiber core. According to the optical fiber mode add-drop multiplexer, the coupling length differences among different modes are increased by introducing the auxiliary optical fiber cores and coupling specific modes of the main body optical fiber cores, effective separation of the modes is realized, interference among the modes is inhibited effectively, and the functions of selectively extracting or inserting the specified modes of a plurality of modes transmitted in a few-mode optical fiber are realized.

Description

technical field [0001] The invention relates to the field of optical fiber communication, and is specifically divided into a mode add / drop multiplexer with the function of realizing mode insertion and separation in an optical fiber. Background technique [0002] The signal transmission in optical fiber can improve the information transmission capacity of single-channel optical fiber through various methods, such as time division multiplexing, wavelength division multiplexing and other technologies. In recent years, the method of using multi-core optical fiber or multimode optical fiber to transmit different information through different cores or different modes in the same optical fiber, that is, the so-called space division multiplexing technology, has aroused widespread interest. In the space division multiplexing system, each signal carries different information, and each signal can realize large-capacity communication through time division multiplexing and wavelength div...

Claims

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Application Information

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IPC IPC(8): G02B6/02G02B6/24
Inventor 陈明阳
Owner JIANGSU UNIV
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