Response Characteristic of Twisting Second-Azimuthal-Order Few-Mode Long-Period Fiber Grating

Xincheng Huang; Xiaowen Wu; Shecheng Gao; Yuanhua Feng; Weiping Liu

doi:10.3788/CJL201946.1206001

Chinese Journal of Lasers, Volume. 46, Issue 12, 1206001(2019)

Response Characteristic of Twisting Second-Azimuthal-Order Few-Mode Long-Period Fiber Grating

Xincheng Huang^1,2, Xiaowen Wu¹, Shecheng Gao^1、*, Yuanhua Feng¹, and Weiping Liu¹

¹Department of Electronics and Engineering, College of Information Science and Technology, Jinan University, Guangzhou, Guangdong 510632, China

²Department of Electronics and Information, Huzhou University Qiuzhen College, Huzhou, Zhejiang 313000, China

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Figures & Tables(8)

Fig. 1. Dispersion curves of twisting responsivity χ of first- and second-azimuthal-order LPFGs

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Fig. 2. Mode coupling efficiency as a function of fiber twisting rate for second-azimuthal-order FM-LPFG under two different coupling conditions. (a) $\begin{matrix} |κ_{21}^{*}| \end{matrix}$ <

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Fig. 3. Experimental setup of twisting

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Fig. 4. Transmission spectra of second-azimuthal-order FM-LPFG as a function of fiber twisting rate. (a) Clockwise twisting; (b) counter-clockwise twisting

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Fig. 5. Position of resonant peak in transmission spectrum of second-azimuthal-order FM-LPFG as a function of fiber twisting rate

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Fig. 6. Intensity of resonant peak in transmission spectrum of second-azimuthal-order FM-LPFG as a function of fiber twisting rate

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Table 1. Values of first-order dispersion of four fiber propagation modes with lowest order at different wavelengths in COMSOL simulation

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Table 1. Values of first-order dispersion of four fiber propagation modes with lowest order at different wavelengths in COMSOL simulation

Wavelength /nm	First-order dispersion /(ps·nm^-1·km^-1)
Wavelength /nm	LP₀₁	LP₁₁	LP₂₁	LP₀₂
12501350141014501510155016101650	5.8242504.9930564.5769874.3278383.9905853.7871793.5100273.341819	5.8204074.9893234.5733204.3242153.9870273.7836653.5065793.338413	5.8154764.9845724.5686794.3196493.9825763.7792923.5023273.334245	5.8139294.9831464.5673344.3183633.9813873.7781753.5013323.333345

Table 2. Twisting sensitivity of central wavelength or intensity of resonant peak of different types of LPFG

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Table 2. Twisting sensitivity of central wavelength or intensity of resonant peak of different types of LPFG

Mode type and order	Twisting sensitivity of centralwavelength of the loss tip /[nm·(rad·m^-1)^-1]	Twisting sensitivity ofdepth of the loss tip /[dB·(rad·m^-1)^-1]	Linear responserange /(m·rad^-1)
LP₁₁ core mode^[12]	0.53	Weak	(-100, 100)
LP₁₁ core mode^[15]	0.21		(-40, 40)
LP₁₄ cladding mode^[16]		1.07	(-6, 6)
LP₂₁ core mode (this paper)	0.72	0.81	(-100,-20)∪(20,100)or (-20,20)

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Xincheng Huang, Xiaowen Wu, Shecheng Gao, Yuanhua Feng, Weiping Liu. Response Characteristic of Twisting Second-Azimuthal-Order Few-Mode Long-Period Fiber Grating[J]. Chinese Journal of Lasers, 2019, 46(12): 1206001

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Paper Information

Category: fiber optics and optical communications

Received: May. 21, 2019

Accepted: Aug. 7, 2019

Published Online: Dec. 2, 2019

The Author Email: Gao Shecheng (gaosc825@163.com)

DOI:10.3788/CJL201946.1206001

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology