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A Fiber Mode Add-Drop Multiplexer

An add-drop multiplexer and mode technology, which is applied in cladding optical 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 different mode coupling, and the mode field deformation is serious and other issues, to achieve low crosstalk coupling, increase the difference in coupling length, and increase the effect of the effect

Inactive Publication Date: 2016-01-13
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 separator, but it is difficult to avoid the coupling between different modes【Opt.FiberTechnol.,2011,17(5) :490-494】
The multiplexing and separation of multiple modes can be achieved by using multi-core optical fiber. The disadvantage is that the fiber core composed of four dielectric columns is used, and the mode field deformation is relatively serious【Opt.Express,2010, 18(5):4709-4716], and this device is still a mode multiplexer / demultiplexer rather than a mode add / drop multiplexer
Using a waveguide structure, mode add-drop multiplexing can also be achieved, but the structure is relatively complicated [Opt.Express, 2013, 21(15): 17904-17911, Opt.Express ,2013,21(17):20220-20229】

Method used

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  • A Fiber Mode Add-Drop Multiplexer
  • A Fiber Mode Add-Drop Multiplexer
  • A Fiber Mode Add-Drop Multiplexer

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Experimental program
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Embodiment 1

[0032] 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 length of the optical fiber 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 mo...

Embodiment 2

[0034] 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 the adjacent auxiliary cores is 11.9 μm, and the distance between adjacent auxiliary cores is 7 μm. The length of the optical fiber is taken as 3.48mm. 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 ma...

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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. The fiber core includes two main fiber cores and several auxiliary fiber cores. The central lines of all the fiber cores form a straight line. , the auxiliary core is located between the two main cores, and the center-to-center distances of all adjacent auxiliary cores are the same, and the auxiliary core is a single-mode optical fiber. The multiplexed modes to be separated are input from one main core, one of the modes is output from another main core, and the remaining modes are still output from the original main core. The present invention increases the coupling length difference between different modes by introducing the coupling between the auxiliary core and the specific mode of the main core, realizes the effective separation of the modes, and effectively suppresses the interference between the modes, and can realize the few-mode optical fiber The function of selectively extracting or inserting specific patterns from multiple patterns transmitted in

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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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/02G02B6/24
Inventor 陈明阳
Owner JIANGSU UNIV
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