Analysis of Optical Power Limit of Injection Fiber for Long Distance Transmission of High Power Laser in Single Mode Fiber

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

Abstract

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

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.

Figures/Tables 8

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

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

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

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

Fig.4 Proposed SRS limits and traditional SRS limits

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

Fig.6 Output spectrum of stimulated Raman scattering experiment

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

References 9

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