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656 results on '"Ma, Yuehui"'

51. Optically tunable mode-locked fiber laser using long-period grating coated with multiwall carbon nanotubes.

Author

Jiang, Chen, Wan, Ying, Yun, Ling, Ma, Yuehui, Chen, Siyu, Sun, Bing, Dai, Lilong, Mou, Chengbo, Liu, Yunqi, and Zhang, Zuxing

Subjects
MODE-locked lasers, FIBER lasers, CARBON nanotubes, OPTICAL modulation, MULTIWALLED carbon nanotubes, LIGHT filters
Abstract

We demonstrate an optically tunable mode-locked fiber laser using long-period fiber grating (LPFG) coated with multi-walled carbon nanotubes (CNTs). The multi-walled CNTs can absorb light to convert it into thermal energy, and the resonance wavelength of the grating can be easily turned by varying the external modulated light power. This multi-walled CNT coated LPFG-based all-optical fast and efficient spectrum tunable filter enables continuous tuning of the central wavelength of the laser by manipulating the loss of the mode-locked laser, ensuring the stability of the mode-locking state. In the absence of modulated light on multi-walled CNTs, the soliton laser could generate 890 fs pulses at 1546.7 nm with a spectrum bandwidth of 3.26 nm and a signal-to-noise ratio of 73.1 dB. Through adjustment of the pump power of the modulation light on multi-walled CNTs, the mode-locked fiber laser can be continuously tuned from 1546.71 to 1563.15 nm. The response time of the optically tunable system was measured to be in the order of hundreds of milliseconds. The presented optical tuning filter shows great potential in the fiber laser system, offering a repeatable, straightforward, and rapidly responsive laser tuning technique. [ABSTRACT FROM AUTHOR]

Published
2024
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66. Broadband OAM Mode Generator Based on Helical Long-Period Grating Inscribed by Automated CO-Laser<sub/>

Author

Jiang, Chen, Wan, Ying, Ma, Yuehui, Sun, Bing, Zhang, Zuxing, and Liu, Yunqi

Abstract

We demonstrate the fabrication of a broadband helical long-period grating (HLPG) in a double-cladding fiber. The proposed method uses a double-side CO2-laser automated inscription technique that allows for the rotation and moving of the fiber during laser irradiation. Gratings with different pitches have been fabricated, covering a broadband wavelength range. A 10-dB bandwidth of 160 nm was achieved for the grating with a resonance wavelength of 1554.2 nm, which featured a compact length of 5.98 mm. Additionally, by splicing the HLPG with two-mode fiber (TMF), the HLPG-TMF structure could convert the fundamental mode to the first-order orbital angular momentum (OAM) core mode with a bandwidth of more than 130 nm. The proposed HLPG could be adopted as a broadband tunable mode converter, OAM generator, and broadband fiber filter, which can be used in fiber communication and sensing systems.

Published
2024
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67. Characteristics of Helical Long-Period Gratings Inscribed in Seven-Core Fibers by CO2 Laser

Author

Chen, Siyu, Ma, Yuehui, Jiang, Chen, Mou, Chengbo, and Liu, Yunqi

Abstract

We demonstrated the fabrication of helical long-period gratings (HLPGs) in a seven-core fiber (SCF) using CO2-laser irradiation. The mode coupling from the fundamental core mode to both LP11 core mode and LP17 cladding mode can be realized using the HLPGs with different grating periods. The torsion, refractive index, temperature, axial strain, and polarization-dependent loss characteristics of the HLPGs in different cores were investigated experimentally. The HLPG was found to have a high torsion sensitivity of 0.61 nm/(rad/m), refractive index sensitivity of −4837.8 nm/RIU when the surroundings refractive index changes in the range of 1.445–1.454, temperature sensitivity of 0.17 nm/°C and strain sensitivity of −9.6 pm/μϵ. The proposed SCF-HLPGs could have applications as multi-channel high-sensitivity fiber sensors, and multicore few-mode mode converters for space division multiplexing.

Published
2024
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77. Diversity of the fecal microbiota in Chinese ponies

Author

Lv, Shipeng, primary, Zhang, Yanli, additional, Zhang, Zhengkai, additional, Meng, Sihan, additional, Pu, Yabin, additional, Liu, Xuexue, additional, Liu, Lingling, additional, Ma, Yuehui, additional, Liu, Wujun, additional, and Jiang, Lin, additional

Published
2023
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98. Whole‐genome identification of transposable elements reveals the equine repetitive element insertion polymorphism in Chinese horses.

Author

Liu, Xuexue, Zhang, Yanli, Pu, Yabin, Ma, Yuehui, and Jiang, Lin

Subjects
WILD horses, SHORT tandem repeat analysis, BIOLOGICAL evolution, HORSE breeds, SMOOTH muscle contraction, HORSES, GENOMES
Abstract

Transposable elements (TEs) are diverse, abundant, and complicated in genomes. They not only can drive the genome evolution process but can also act as special resources for adaptation. However, little is known about the evolutionary processes that shaped horses. In this work, 126 horse assemblages involved in most horse breeds in China were used to investigate the patterns of TE variation for the first time. By using RepeatMasker and melt software, we found that the horse‐specific short interspersed repetitive elements family, equine repetitive elements (ERE1), exhibited polymorphisms in horse genomes. Phylogenetic analysis based on these ERE1 loci (minor allele frequency ≥0.05) revealed three major horse groups, namely, those in northern China, southern China, and Qinghai‐Tibetan, which mirrors the result determined by SNPs to some extent. The present ERE1 family emerged ~0.26 to 1.77 Mya ago, with an activity peak at ~0.49 Mya, which matches the early stage of the horse lineage and decreases after the divergence of Equus caballus and Equus ferus przewalskii. To detect the functional ERE1(s) associated with adaptation, locus‐specific branch length, genome‐wide association study, and absolute allele frequency difference analyses were conducted and resulted in two common protein‐coding genes annotated by candidate ERE1s. They were clustered into the vascular smooth muscle contraction (p = 0.01, EDNRA) and apelin signalling pathways (p = 0.02, NRF1). Notably, ERE1 insertion into the EDNRA gene showed a higher association with adaptation among southern China horses and other horses in 15 populations and 451 individuals (p = 4.55 e–8). Our results provide a comprehensive understanding of TE variations to analyse the phylogenetic relationships and traits relevant to adaptive evolution in horses. [ABSTRACT FROM AUTHOR]

Published
2023
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100. Wavelength Tunable Orbital Angular Momentum Mode Convertor Based on Helical Long-Period Grating Inscribed in Six-Mode Fiber Using CO2 Laser

Author

Zhang, Weidong, Ma, Yuehui, Jiang, Chen, Zhao, Xinyi, Chen, Long, and Liu, Yunqi

Abstract

We demonstrated the fabrication of orbital angular momentum (OAM) mode convertors (MCs) operating at 1.3–2.1-μm waveband based on the helical long-period gratings (HLPGs) inscribed in the few-mode fiber (FMF) using a CO2 laser. The ±1st, ±2nd, and ±3rd OAM mode can be directly generated by the HLPGs with efficiencies of more than 90%. The torsion sensitivities of the first-, second-, and third-order OAM modes in 2-μm waveband are 0.52, 0.55, and 0.36 nm/(rad/m), which has increased by 5.8 times, 2.8 times, and 1.6 times compared to that in 1.3-μm waveband, respectively. The strain sensitivities of the first-, second-, and third- order OAM modes in 2-μm waveband are −4.2, −4.0, and −4.9 pm/ $\mu \varepsilon $ , which has increased by 2.3 times, 2 times, and 2.2 times compared to that in 1.3-μm waveband, respectively. The proposed OAM mode MCs based on the HLPGs can function as not only promotion of optical communication system but also high-torsion sensitivity sensors in the sensing field.

Published
2023
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