Optical fiber filter and optical fiber amplifier

A technology of fiber optic filter and fiber grating, applied in the direction of optical waveguide light guide, laser, cladding fiber, etc., to achieve the effect of improving the effect

Pending Publication Date: 2021-07-30
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The application provides an optical fiber filter and an optical fiber amplifier, which can solve the problem that the existing optical fiber filter cannot achieve gain equalization for two or more optical signal modes

Method used

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  • Optical fiber filter and optical fiber amplifier
  • Optical fiber filter and optical fiber amplifier
  • Optical fiber filter and optical fiber amplifier

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0155] This simulation example is shown in conjunction with the coupling mode 1 shown above, that is, the first optical signal mode LP01 transmitted by the fiber core is coupled to the second optical signal mode LP31 . Specifically, in this simulation example, the simulation is carried out according to different values ​​of the number N of the grating period of the target fiber grating 601. For the description of the number N of the grating period, please refer to the coupling mode 1 for details. repeat. This simulation example does not limit the sub-gratings that include the number N of the grating period, for example, the sub-gratings that include the number N of the grating period can be G 1-1 , G 1-2 , G 1-3 , G 1-4 , G 1-5 and G 1-6 one or more of the .

[0156] Optionally, this simulation example takes the number N of grating periods taking values ​​in the interval 40 to 400 as an example. For example, the number N of grating periods takes values ​​in this interval...

example 2

[0162] This simulation example is shown in conjunction with the coupling mode 2 shown above, that is, the first optical signal mode LP11 transmitted by the fiber core is coupled to the second optical signal mode LP12 . Specifically, in this simulation example, the simulation is performed according to different values ​​of the number N of grating periods of the target fiber grating 602. For the description of the value of the number N of grating periods, please refer to the above simulation example 1 , without repeating the details.

[0163] Coupling the first optical signal mode LP11 with respect to the target fiber grating 602 having the number N of the above-mentioned grating periods to obtain such as Figure 8 For the transmission spectrum 802 shown, and the description of the coordinates of the transmission spectrum 802 , please refer to the above simulation example 1 for details, and details are not repeated here.

[0164] It can be seen from the transmission spectrum 80...

example 3

[0167] This simulation example is shown in conjunction with the above-mentioned coupling mode 3, that is, the first optical signal mode LP21 transmitted by the fiber core is coupled to the second optical signal mode LP03. Specifically, in this simulation example, the simulation is performed according to different values ​​of the number N of grating periods of the target fiber grating 603. For the description of the value of the number N of grating periods, please refer to the above simulation example 1 , without repeating the details.

[0168] Coupling the first optical signal mode LP21 with respect to the target fiber grating 603 having the number N of the above-mentioned grating periods to obtain such as Figure 9 For the transmission spectrum 903 shown, and the description of the coordinates of the transmission spectrum 903 , please refer to the above simulation example 1 for details, and details are not repeated here.

[0169] It can be seen from the transmission spectrum...

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Abstract

The invention provides an optical fiber filter and an optical fiber amplifier, which can realize flat amplification of a few-mode optical signal, so that the optical power of each of a plurality of optical signal modes transmitted by a fiber core of the optical fiber filter can be controllably adjusted. The optical fiber filter comprises a fiber core, an inner cladding and an outer cladding. The refractive index of the fiber core, the refractive index of the inner cladding and the refractive index of the outer cladding are sequentially decreased. The fiber core is used for transmitting at least two different first optical signal modes. The inner cladding is used for transmitting at least two different second optical signal modes. At least one fiber grating is etched on the fiber core. At least part of optical power of a target first optical signal mode is only coupled to a target second optical signal mode at the fiber grating, the target first optical signal mode is one of the at least two first optical signal modes, and the target second optical signal mode is one of the at least two second optical signal modes.

Description

technical field [0001] The present application relates to the field of optical fiber communication, in particular to an optical fiber filter and an optical fiber amplifier. Background technique [0002] Optical fiber filters are used to adjust the optical power of optical signals to achieve gain equalization. Such as figure 1 as shown, figure 1 The structure of a length of optical fiber 100 is shown. The optical fiber filter is formed by cascading multiple segments of optical fiber 100 . [0003] The optical fiber 100 includes a core 101 and a cladding 102 . The optical power of the optical signal of a specific wavelength transmitted by the fiber core 101 is coupled to the cladding 102 based on phase matching, so as to realize the adjustment of the optical power of the optical signal of the specific wavelength. The optical fiber filter includes cascaded multiple sections of optical fiber 100, and different sections of optical fiber 100 are used to adjust the optical pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02G02B6/293H01S3/067
CPCG02B6/02295G02B6/29319G02B6/02123H01S3/06754H01S3/06783H01S2301/04H01S3/0078H01S3/1608H01S3/0804G02B6/02066G02B6/03633G02B6/29391
Inventor 李巨浩朱景龙何永琪吴圣灵郭强陈瑞山周锐
Owner HUAWEI TECH CO LTD
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