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A Few Mode Fiber Device

A few-mode optical fiber and device technology, applied in the field of optical fiber communication, can solve problems such as poor output spectrum uniformity, difficulty in multiplexing and decomposition, and narrow operating bandwidth, and achieve good output energy uniformity, wide operating wavelength range, and polarization-independent Effect

Inactive Publication Date: 2019-04-02
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Generally, the conversion characteristics of mode converters based on the mode coupling principle have a strong wavelength dependence, narrow operating bandwidth, and poor output spectrum uniformity
Since the mode effective refractive index of the quadruple degenerate mode in the fiber is equal, there are also great difficulties in the multiplexing and decomposition of this mode
For the application of few-mode fiber systems, there is still a lack of effective means to selectively filter out one or some specific modes

Method used

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Embodiment 1

[0032] figure 1 It is a schematic diagram of the structure of the optical fiber embodiment 1 of the present invention. The number of auxiliary cores is M=1, and it satisfies: n i-1 >n f >n i (I≥i>1) or n f >n i (i=1); where, n i The effective refractive index of the i-th mode of the main core, I is the total number of modes of the main core, and there are n i-1 >n i (I≥i>1), n f is the effective refractive index of the fundamental mode of the auxiliary core. Both the main fiber core and the auxiliary fiber core have one number. There are main fiber core and auxiliary fiber core at the multi-core end face, while only the main fiber core exists at the single core end face.

[0033] At the working wavelength, the main fiber core 1 is a few-mode fiber core, that is, it can transmit high-order modes. The present invention implements operations such as introducing, extracting, and converting modes in the main fiber core 1 by introducing an auxiliary fiber core 2 .

[0034...

Embodiment 2

[0058] The invention can realize multiplexing and demultiplexing of optical fiber modes. The relationship between the quantity M of the auxiliary fiber core and the number of main fiber core modes I and the number of degenerate modules N of the main fiber core is: M=I+N; the central axes of I auxiliary fiber cores are in the same plane, and the auxiliary fiber core is defined as The first type of auxiliary fiber core is used to input the I modes of the main fiber core respectively; the central axis of the other N auxiliary fiber cores is not in this plane, which is defined as the second type of auxiliary fiber core, which is used to input the main fiber core respectively. Another of the N quadruple degenerate patterns.

[0059] Figure 6 Given one of the schemes, there are 6 auxiliary fiber cores, of which 4 are first-type auxiliary fiber cores, and the central axes of the four first-type auxiliary fiber cores 21, 22, 23, 24 are connected to the center of the main fiber core....

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Abstract

A few-mode fibre device. A fibre core of the few-mode fibre device is composed of a main fibre core (1) and an auxiliary fibre core (2), wherein there is only one main fibre core (1), and the normalized frequency V m meets the condition that V m > 2.405, i.e. supporting high-order mode transmission; the number of auxiliary fibre cores (2) is M, wherein M ≥ 1; one end of the auxiliary fibre cores (2) intersects with a side face of the main fibre core (1), and the central axis of the main fibre core (1) is in the same plane as the central axis of the auxiliary fibre cores (2); the other end of the auxiliary fibre cores (2) is located on an end face of the fibre, and in the end face, the centre distance between any two fibre cores is greater than the sum of the radii of the two fibre cores; and a parameter between any auxiliary fibre core (2) and the main fibre core (1) meets: the main fibre core (1) at least has a transmission mode of which the effective refractive index is less than the effective refractive index of a fundamental mode of the auxiliary fibre cores (2). A mode in a few-mode fibre can be converted, combined, separated or filtered.

Description

technical field [0001] The invention relates to the field of optical fiber communication, in particular to an optical fiber device capable of converting, merging, separating or filtering modes in a few-mode optical fiber. Background technique [0002] In recent years, due to the limitation of transmission capacity of single-mode fiber, the communication technology based on few-mode fiber has aroused widespread interest. The method of using few-mode fiber to transmit different information in different modes, the so-called mode division multiplexing technology, can double the transmission capacity of the fiber. At the same time, the few-mode fiber can also have a larger core area. In order to reduce the fiber nonlinear effect caused by various multiplexing technologies. In addition to the application of mode division multiplexing technology, few-mode fiber can also achieve large-mode field single-mode transmission, dispersion compensation, ultrashort pulse transmission and no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/14G02B6/293
CPCG02B6/14G02B6/293
Inventor 陈明阳曹国栋刘丕丕
Owner JIANGSU UNIV
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