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Ring auxiliary type few-mode optical fiber for uncoupled mode-division multiplexing transmission and transmission method of ring auxiliary type few-mode optical fiber

A technology of few-mode fiber and mode division multiplexing, which is applied in the direction of graded-index fiber core/cladding fiber, cladding fiber, optics, etc. It can solve the problem of inapplicability, poor effective refractive index, and difficulty in effectively suppressing LP21 and LP02 Mode coupling and other issues, to achieve a good mode extinction ratio, increase the effective refractive index difference, and reduce the effect of preparation difficulty

Active Publication Date: 2016-08-17
上海光织科技有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology can only obtain more than 0.9×10 in two-mode fibers supporting LP01 and LP11 modes -3 The effective refractive index difference, and in the described fiber supporting four LP modes, the technology can realize the effective refractive index difference of less than 0.5×10 -3 , it is difficult to effectively suppress the coupling between LP21 and LP02 modes, so this technical solution is not suitable for weakly coupled few-mode fibers supporting 4 or more LP modes

Method used

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  • Ring auxiliary type few-mode optical fiber for uncoupled mode-division multiplexing transmission and transmission method of ring auxiliary type few-mode optical fiber
  • Ring auxiliary type few-mode optical fiber for uncoupled mode-division multiplexing transmission and transmission method of ring auxiliary type few-mode optical fiber
  • Ring auxiliary type few-mode optical fiber for uncoupled mode-division multiplexing transmission and transmission method of ring auxiliary type few-mode optical fiber

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Embodiment 1

[0032] In this embodiment, a loop-assisted weakly coupled four-mode fiber is designed and optimized. To ensure four-mode operation and the highest order guided mode (LP 02 mode) capable of low-loss transmission, first study the possible core size and refractive index combination of the step-index fiber in the case of V = 5.1, and study their effective refractive index difference between modes at 1550nm and the mode field area with the fiber Variation of parameters. Such as figure 1 As shown in , while keeping the V value constant, as the core size increases, the effective refractive index difference of each mode decreases gradually, and the minimum mode field area of ​​each mode increases significantly. Therefore, for the conventional step structure For few-mode fibers, there is an obvious mutual constraint relationship between the mode effective refractive index difference and the mode field area, and the limiting bottleneck is mainly LP 21 with LP 02 There is a small dif...

Embodiment 2

[0039] In this embodiment, a ring-assisted weakly coupled seven-mode fiber with grooves is designed. Fiber structure such as Figure 6 As shown in (a), the area indicated by the horizontal line is the core 1, the area indicated by the vertical line is the high refractive index ring 2 in the core, and the area indicated by the dot is the groove structure 4, which is used to compensate the bending loss. Such as Figure 6 As shown in (b), it is a schematic diagram of the refractive index distribution of the fiber section. It can be seen from the figure that the core diameter is 2R, the relative refractive index difference between the core and the cladding is Δn, and the inner circle diameter of the high refractive index ring in the fiber core is 2R in_ring , the radial width of the ring is W ring , the relative refractive index difference between ring and core is Δn + , a low-refractive-index groove is set between the core and the cladding, and the radial width of the groove i...

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Abstract

The invention relates to a ring auxiliary type few-mode optical fiber for uncoupled mode-division multiplexing transmission and a transmission method of the ring auxiliary type few-mode optical fiber. The ring auxiliary type few-mode optical fiber comprises a fiber core and a wrapping layer structure. A high refractive index ring is arranged in the fiber core, wherein the electric field intensity of an LP02 mode of the position where the high refractive index ring is located in the optical fiber is (0, 30%] of peak intensity, and the refractive indexes of the other parts, except the high refractive index ring, of the fiber core are the same. The ring auxiliary type few-mode optical fiber for uncoupled mode-division multiplexing transmission and the transmission method of the ring auxiliary type few-mode optical fiber effectively reduce mode coupling in the transmission process. By means of the technology, the minimum effective refractive index difference between modes can be increased by one time or above on the premise that the area of a mode field is basically unchanged, so that the uncoupled few-mode optical fiber with a large mode field area and low mode crosstalk is obtained, and great significance and application prospects are achieved on middle and short distance mode-division multiplexing transmission.

Description

technical field [0001] The invention relates to a technology in the field of optical fiber communication, in particular to a weakly coupled few-mode optical fiber used for mode division multiplexing optical transmission and a transmission method thereof. Background technique [0002] In recent years, the demand for data transmission has continued to maintain an annual growth rate of about 40%, which puts forward higher requirements for the capacity of optical fiber communication systems. By adopting advanced multiplexing methods such as high-power Raman amplification and dense wavelength division multiplexing, as well as coherent detection and DSP digital processing technology, the transmission capacity of ordinary single-mode optical fiber networks has been greatly improved, which is close to its theoretical upper limit of 100Tb / s. Therefore, in order to further improve the transmission capacity of a single fiber, the mode division multiplexing technology based on few-mod...

Claims

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Application Information

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IPC IPC(8): G02B6/028
CPCG02B6/0288
Inventor 何祖源马麟姜寿林樊昕昱杜江兵张文甲徐晓李佳熊
Owner 上海光织科技有限公司
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