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An Erbium-Ytterbium Co-Doped Few-Mode Fiber Amplifier

A few-mode fiber and co-doping technology, which is applied in the field of erbium-ytterbium co-doped few-mode fiber amplifiers, can solve the problems of poor gain effect of the few-mode erbium-doped amplifier, and reduce the power filling factor and improve the pump conversion efficiency. , the effect of reducing differential modal gain

Active Publication Date: 2022-07-26
武汉长进光子技术股份有限公司
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  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide an erbium-ytterbium co-doped few-mode fiber amplifier, which is used to solve the problem of poor gain effect of the few-mode erbium-doped amplifier in the prior art

Method used

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  • An Erbium-Ytterbium Co-Doped Few-Mode Fiber Amplifier
  • An Erbium-Ytterbium Co-Doped Few-Mode Fiber Amplifier
  • An Erbium-Ytterbium Co-Doped Few-Mode Fiber Amplifier

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Embodiment 1

[0034] In this embodiment, please refer to figure 2 , the cross-sectional structure of a corresponds to the refractive index distribution of b, the horizontal axis in b represents the lateral position, and the vertical axis represents the refractive index of the corresponding position. Among them, K n Represents the degree of depression of the refractive index of the core, the greater the Kn, the smaller the degree of depression; K r Represents the proportion of the recessed area in the entire core; R core represents the core radius; n 0 , n 1 represent the highest point of the cladding refractive index and the highest point of the core refractive index, respectively.

[0035] see image 3 , the fixed fiber diameter is 20 μm, K n and K r It varies between 0 and 1. As the degree of depression becomes deeper and the range of depression becomes larger, the number of modes that can exist stably in the fiber gradually decreases; then the preferred K n The range is 0.7~0.9,...

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Abstract

The invention discloses an erbium-ytterbium co-doped few-mode fiber amplifier, which sequentially comprises a light source laser, a first mode multiplexer, a pump beam combining unit, an erbium-ytterbium co-doped fiber, a cladding optical stripper and a The second mode multiplexer; the erbium-ytterbium co-doped fiber sequentially includes a core, an inner cladding and an outer cladding from the inside to the outside, and the core is co-doped with erbium ions and ytterbium ions. The refractive index of the core gradually increases from the inside to the outside, and the refractive index of the core and the outer cladding is smaller than that of the inner cladding. On the one hand, the invention improves the gain of the few-mode amplifier by co-doping erbium and ytterbium; on the other hand, the specific distribution of the refractive index of the optical fiber section increases the area of ​​the mode spot and reduces the power filling factor in the mode group. Under the layer pump structure, the differential modal gain between modes is significantly reduced, and the pump conversion efficiency is improved.

Description

technical field [0001] The invention relates to the field of photoelectric communication, in particular to an erbium-ytterbium co-doped few-mode fiber amplifier. Background technique [0002] At present, with the rapid development of optical communication spectrum utilization technology and digital signal processing technology, the data capacity that ordinary single-mode fiber can carry has reached the nonlinear Shannon limit (100 Tbit / s), which cannot meet the growing demand for network traffic. Spatial division multiplexing technology can improve channel capacity and transmission reliability by constructing multiple-input multiple-output (MIMO) spatial channels, and was first used in wireless communications where frequency band resources are scarce. In optical fiber communication, space division multiplexing technology uses a single core in a multi-core fiber, a few-mode fiber or an orthogonal mode in a multi-mode fiber as a transmission channel, and has achieved Pbit tran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/16H01S3/067
Inventor 王一礴徐中巍王顺
Owner 武汉长进光子技术股份有限公司
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