Al<sub>0.24</sub>Ga<sub>0.76</sub>As光子晶体光纤中的宽带高相干性超连续谱

夏镛涛; 侯尚林; 冯云龙; 谢彩健; 雷景丽; 武刚; 晏祖勇

doi:10.37188/CO.EN-2025-0011

Al_0.24Ga_0.76As光子晶体光纤中的宽带高相干性超连续谱

1.
兰州理工大学理学院, 甘肃兰州 730050
2.
仲恺农业工程学院信息科学与技术学院, 广东广州 510225

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中图分类号: O437.3;
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出版历程
- 收稿日期: 2025-02-26
- 录用日期: 2025-04-29
- 网络出版日期: 2025-09-27

Broadband high-coherence supercontinuum in Al_0.24Ga_0.76As photonic crystal fibers

doi: 10.37188/CO.EN-2025-0011

1.
School of Science, Lanzhou University of Technology, Lanzhou 730050, China
2.
College of Information Science and Technology, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China

Funds: Supported by National Natural Science Foundation of China (No. 61665005); Natural Science Foundation of Gansu Province (No. 24JRRA208)

More Information

Author Bio:
XIA Yong-tao (1998—), male, born in Tianshui, Gansu Province, master student. He received his bachelor's degree from Lanzhou University of Technology in 2020. He is mainly engaged in research on guided-wave optics and optical fiber communication technologies. E-mail：15117207213@163.com

HOU Shang-lin (1970—), male, born in Tianshui, Gansu Province, Ph.D., professor and doctoral supervisor. He received his Ph.D. from Beijing University of Posts and Telecommunications in 2008. He is mainly engaged in research on novel optical fibers and high-speed optoelectronic devices, next-generation high-speed all-optical communication networks, as well as fiber optic sensors and sensing network technologies. E-mail: houshanglin@vip.163.com

Corresponding author: houshanglin@vip.163.com

摘要

摘要:
提出了一种可替代的椭圆形和圆形空气孔辅助型Al_0.24Ga_0.76As光子晶体光纤来产生宽带高相干性中红外超连续谱，利用有限元法对其色散、有效模场面积和非线性系数进行了研究，模拟了光脉冲沿光纤的演化过程，分析和评估了不同泵浦条件下的超连续谱及其相干性。结果表明当光纤占空比d₁/Λ为0.125、d₂/Λ为0.583并且零色散波长为3.228 μm时，通过在3.3μm处以峰值功率800 W、半高全宽20 fs的高斯脉冲泵浦10 mm光纤，可获得谱宽为4.852 μm的超连续谱。在反常色散区泵浦脉冲波长为4.0 μm、峰值功率为2000 W、半高全宽为80 fs时，调制不稳定性效应被明显抑制，可获得从1.1 μm扩展到8.99 μm的宽带高相干性超连续谱。在正常色散区2.8 μm处泵浦该光纤，可使部分脉冲能量转移到反常色散区，可在10 mm光纤输出端得到了从0.8 μm扩展到9.8 μm的宽带高相干性超连续谱。本文在Al_0.24Ga_0.76As光子晶体光纤中引入了椭圆气孔，为调整超连续谱的性能增加了灵活度，实现了用最短的光纤获得了最宽的超连续谱。
- 超连续谱 /
- 光子晶体光纤 /
- 相干性 /
- Al_0.24Ga_0.76As
Abstract:
An alternative elliptical and circle air-hole-assisted Al_0.24Ga_0.76As photonic crystal fiber (PCF) was proposed for generating broadband high-coherence mid-infrared supercontinuum, and the dispersion, effective mode area and nonlinear coefficient were investigated by using finite element method (FEM), the evolution of optical pulses propagating along the fiber was simulated, and the supercontinuum and the coherence were analyzed and evaluated under different pumping conditions. The results show that a supercontinuum spectrum with a spectral width of 4.852 μm can be obtained in the proposed fiber with d₁/Λ of 0.125, d₂/Λ of 0.583 and the zero-dispersion wavelength of 3.228 μm by pumping with a Gaussian pulse with a peak power of 800 W and a full width at half maximum (FWHM) of 20 fs at wavelength of 3.3 μm. When the fiber is pumped by the pulse with the peak power of 2000 W, the FWHM of 80 fs at the wavelength of 4.0 μm in the in the anomalous dispersion region, the modulation instability is obviously suppressed, and the high-coherence supercontinuum spectrum spanning from 1.1 μm to 8.99μm is observed. A part of the pulse energy is transferred to the anomalous dispersion region when pumped at the wavelength of 2.8 μm in the normal dispersion region and a broadband high-coherence supercontinuum spectrum extending from 0.8 μm to 9.8 μm is generated in the 10 mm proposed fiber. This paper introduces elliptical air holes in the Al_0.24Ga_0.76As photonic crystal fiber, which enhances flexibility for tailoring the performance of supercontinuum, ultimately achieving the broadest supercontinuum spectrum with the shortest fiber length to date.
- supercontinuum /
- photonic crystal fiber /
- coherence /
- Al_0.24Ga_0.76As

HTML全文

图 1 所提出PCF的(a)横截面示意图和(b)电场分布图

Figure 1. (a)The cross-sectional schematic and (b) the electric field distribution of the proposed PCF.

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图 2 不同d₁/Λ下(a)色散参量和(b)非线性系数与有效模场面积随着波长的变化

Figure 2. (a) Dispersion parameter and (b) Nonlinear coefficient and effective mode area as functions of wavelength for different d₁/Λ.

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图 3 不同d₂/Λ下(a)色散参量和(b)非线性系数与有效模场面积随着波长的变化

Figure 3. (a) Dispersion parameter and (b) Nonlinear coefficient and effective mode area as functions of wavelength for different d₂/Λ.

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图 4 不同(a~f) d₁/Λ和(g~l) d₂/Λ下PCF中产生的SC

Figure 4. SC generated by the PCF for different (a-f) d₁/Λ and (g-l) d₂/Λ.

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图 5 在反常色散区不同泵浦条件下产生的SC

Figure 5. SC generated under different pumping conditions in the anomalous dispersion region.

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图 6 泵浦波长3.3 μm处SC的(a)频域和(b)时域演化

Figure 6. SC evolution at a pump wavelength of 3.3 μm in the (a) frequency domain and (b) time domain.

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图 7 泵浦波长4.0 μm处SC的(a)频域和(b)时域演化

Figure 7. SC evolution at a pump wavelength of 4.0 μm in the (a) frequency domain and (b) time domain.

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图 8 泵浦波长为(a) 3.3 μm和(b) 4.0 μm时SC的相干性变化

Figure 8. Coherence variation of SC at pump wavelengths of (a) 3.3 μm and (b) 4.0 μm.

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图 9 正常色散区光纤输出端的(a~c)SC及其(d~f)相干性随着波长的变化

Figure 9. (a−c) SC and (d−f) coherence at the fiber output in the normal dispersion region as a function of wavelength.

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图 10 泵浦波长2.8 μm处SC的(a)频域和(b)时域演化

Figure 10. SC evolution at a pump wavelength of 2.8 μm in the (a) frequency domain and (b) time domain.

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表 1 Soliton order and characteristic lengths for different pulses at a pump wavelength of 3.3 μm.

Table 1. Soliton order and characteristic lengths for different pulses at a pump wavelength of 3.3 μm.

λ_pump=3.3 μm	T_FWHM=20 fs	T_FWHM=50 fs	T_FWHM=80 fs
P₀=800 W	N=6.50	N=16.20	N=25.86
	L_fiss=1.65 mm	L_fiss=4.12 mm	L_fiss=6.60 mm
	L_MI=4.08 mm	L_MI=4.08 mm	L_MI=4.08 mm
P₀=1500 W	N=8.85	N=22.00	N=35.40
	L_fiss=1.20 mm	L_fiss=3.00 mm	L_fiss=4.80 mm
	L_MI=2.18 mm	L_MI=2.18 mm	L_MI=2.18 mm
P₀=2000 W	N=10.20	N=25.56	N=40.90
	L_fiss=1.04 mm	L_fiss=2.61 mm	L_fiss=4.2 mm
	L_MI=1.60 mm	L_MI=1.60 mm	L_MI=1.60 mm

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表 2 Soliton order and characteristic lengths for different pulses at a pump wavelength of 4.0 μm.

Table 2. Soliton order and characteristic lengths for different pulses at a pump wavelength of 4.0 μm.

λ_pump=4.0 μm	T_FWHM=20 fs	T_FWHM=50 fs	T_FWHM=80 fs
P₀=800 W	N=0.95	N=2.40	N=3.80
	L_fiss=0.34 mm	L_fiss=0.85 mm	L_fiss=1.36 mm
	L_MI=5.70 mm	L_MI=5.70 mm	L_MI=5.70 mm
P₀=1500 W	N=1.30	N=3.30	N=5.20
	L_fiss=0.25 mm	L_fiss=0.62 mm	L_fiss=0.99 mm
	L_MI=3.05 mm	L_MI=3.05 mm	L_MI=3.05 mm
P₀=2000 W	N=1.50	N=3.76	N=6.01
	L_fiss=0.20 mm	L_fiss=0.54 mm	L_fiss=0.86 mm
	L_MI=2.30 mm	L_MI=2.30 mm	L_MI=2.30 mm

下载: 导出CSV

表 3 Comparison of SC generated in different PCFs in recent years.

Table 3. Comparison of SC generated in different PCFs in recent years.

Researches	Material used	Publication Year	Wavelength range	Peak Power(kW)	SC Span(nm)	Fiber length(mm)
[55]	AsSe₂ and As₂S₅	2020	Near and Mid-infrared	10.120	2100	30
[29]	Ge₂₀Sb₁₅Se₆₅	2021	Mid-infrared	1.000	4257	1
[56]	Si and MgF₂	2021	Near and Mid-infrared	1.000	2700	10
[57]	As₂Se₃ and As₂S₅	2022	Mid-infrared	10.000	8000	34
[58]	Ge₂₀Sb₁₅Se₆₅	2023	Near and Mid-infrared	0.500	6020	25
[59]	As₂S₃	2023	Mid-infrared	1.000	3260	45
[60]	As₃₈Se₆₂	2024	Mid-infrared	1.800	6500	28
[61]	As₂Se₃	2024	Mid-infrared	2.778	5944	100
[44]	Al_0.24Ga_0.76As	2021	Near and Mid-infrared	2.500	6000	50
[45]	Al_0.24Ga_0.76As	2023	Near and Mid-infrared	2.500	6800	50
This Study	Al_0.24Ga_0.76As (anomalous dispersion region)	——	Near and Mid-infrared	2.000	7890	10
This Study	Al_0.24Ga_0.76As (normal dispersion region)	——	Near and Mid-infrared	2.000	9000	10

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