大功率激光单模光纤远距离传输的注入光纤光功率限值分析

doi:10.19596/j.cnki.1001-246x.8373

摘要/Abstract

摘要：

对于大功率激光单模光纤远距离传输, 采用传统的受激拉曼散射(SRS)阈值作为注入光纤激光功率值取值过大。本文对单模光纤远距离传输过程中泵浦光和拉曼斯托克斯光(Stokes)光功率随注入光纤激光功率的变化进行仿真与理论分析。根据光纤中SRS产生的机理, 提出以拉曼Stokes光在单模光纤中传输的光功率变化曲线曲率极大值点对应的注入激光功率为限值, 对注入单模光纤光功率限值随着光纤长度变化进行仿真, 通过曲线拟合得出注入单模光纤激光功率限值公式, 并搭建实验系统进行验证。结果表明, 提出的注入单模光纤激光功率限值适用于大功率激光远距离单模光纤传输。

关键词: 注入光纤光功率限值, 受激拉曼散射, 阈值, 单模光纤, 激光能量光纤传输

Abstract:

For long-distance transmission of high-power laser in single-mode fiber, traditional Raman scattering (SRS) threshold is used as the laser power of the injected fiber, which is too large. In this paper, the variation of pump and Stokes power with laser power of injected fiber of high-power laser over long-distance single-mode fiber is simulated and analyzed theoretically. According to the mechanism of SRS generation in the fiber, optical power limit of injected fiber suitable for high-power laser over long-distance single-mode fiber is proposed. The limit of injected laser power corresponds to the maximum curvature point of the power curve of Raman Stokes light propagating in a single-mode fiber. The variation of optical power limit with fiber length is simulated and a formula of laser power limit of single-mode fiber is obtained with curve fitting. Experimental results show that the formula is suitable for high-power laser over long-distance single-mode fiber.

Key words: optical power limit of injection fiber, stimulated Raman scattering, threshold, single mode fiber, laser power over fiber

禹化龙, 王石语, 吴嘉宸. 大功率激光单模光纤远距离传输的注入光纤光功率限值分析[J]. 计算物理, 2022, 39(2): 173-178.

Hualong YU, Shiyu WANG, Jiachen WU. Analysis of Optical Power Limit of Injection Fiber for Long Distance Transmission of High Power Laser in Single Mode Fiber[J]. Chinese Journal of Computational Physics, 2022, 39(2): 173-178.

图/表 8

图1 泵浦光和拉曼Stokes在单模光纤中传输随注入光功率的变化

Fig.1 Transmission of pump laser and Raman Stokes in single mode fiber as functions of the power of injected laser

图2 泵浦光和拉曼Stokes在单模光纤中传输随传输距离的变化

Fig.2 Transmission of pump laser and Raman Stokes in single mode fiber as functions of distance

表1 注入光纤的激光功率与传输曲线曲率极大值点对应的光纤长度典型值(Aeff为50 μm2)

Table 1 Typical fiber lengths corresponding to laser power of injected fiber and maximum curvature of transmission curve (Aeff=50 μm2)

注入光纤光功率/W	对应的光纤长度/m
10	1 999
9	2 259
8	2 593
7	3 036
6	3 652
5	4 563
4	6 022
3	8 575
2	13 959
1	26 461

图3 拉曼Stokes光在单模光纤中传输对应的曲率曲线及其极大值点(a) 完整图；(b) 局部放大图；(c) PP=10 W时Stokes光传输曲率局部放大图；(d) PP=4 W时Stokes光传输曲率局部放大图

Fig.3 Curvature curve and its maximum point of Raman Stokes laser propagation in single mode fiber (a) complete picture; (b) partial enlarged drawing; (c) partial enlarged drawing of Stokes at PP=10 W; (d) partial enlarged drawing of Stokes at PP=4 W

图4 提出的SRS限值与传统的SRS限值

Fig.4 Proposed SRS limits and traditional SRS limits

图5 单模光纤受激拉曼散射阈值实验原理图

Fig.5 A schematic of stimulated Raman scattering threshold experiment of single mode fiber

图6 受激拉曼散射实验输出光谱

Fig.6 Output spectrum of stimulated Raman scattering experiment

表2 受激拉曼散射实验输出光功率

Table 2 Output laser power of stimulated Raman scattering experiment

注入光纤光功率/W	输出光功率/W
10	4.725
9	6.955
8	7.890

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