Article
Engineering, Electrical & Electronic
Siyun Huang, Yusong Liu, Ran Xia, Wenjun Ni, Yixiang Sun, Haoguang Liu, Yiyang Luo, Qizhen Sun, Perry Ping Shum, Xiahui Tang
Summary: By using time-stretched spectroscopy based real-time measurement, we reveal the analogy between light and matter from the aspect of molecular vibration. Our study shows that soliton molecules exhibit versatile internal motions, and by analyzing their intrinsic mechanisms, we enrich the understanding of the diverse internal motions in dual-pulse structures, further promoting the research on the analogy between optical soliton molecules and matter molecules.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Optics
X. X. Han, X. A. Yan, Y. W. Xia, X. F. Wang, T. C. Huang
Summary: A temporal-frequency measurement based on a dispersion-managed technique for an MoTe2-based ultrafast laser is proposed, with adjustable resolution in a wide range and application in real-time measurement of ultrafast nonrepetitive signals.
Review
Chemistry, Analytical
Igor Kudelin, Srikanth Sugavanam, Maria Chernysheva
Summary: Ultrafast fiber laser gyroscopes have advantages in sensing applications such as compactness, precise measurements, and relatively low cost, with broad development prospects. While there are bottlenecks and deficiencies, these issues can be addressed through further technological development.
Article
Optics
Kai Yang, Ti-Jian Li, Xing-Di Li, Ji-Xiang Chen, Meng Liu, Hu Cui, Ai-Ping Luo, Wen-Cheng Xu, Zhi-Chao Luo
Summary: This study investigates the polarization instability induced by mutual soliton interactions in bidirectional fiber lasers, finding that the successive interactions of bidirectional solitons mediated by the polarization cross-saturation effect of gain fiber may lead to polarization switching behaviors. These findings open up new possibilities for controlling the soliton polarization state and enhancing performance in bidirectional ultrafast fiber lasers.
Article
Engineering, Electrical & Electronic
Aram A. Mkrtchyan, Mikhail S. Mishevsky, Yuriy G. Gladush, Mikhail A. Melkumov, Aleksandr M. Khegai, Pavlos G. Lagoudakis, Albert G. Nasibulin
Summary: In this study, we investigate dispersion managed ultrashort-pulse generation in a Nd-doped polarization maintaining all-fiber laser operating at a wavelength of 920 nm. By using a linear laser scheme with chirped fiber Bragg grating (CFBG) and semiconductor saturable absorber mirror (SESAM), we achieve high order harmonic mode-locking and near-parabolic shape single pulse operation in the anomalous dispersion regime. Numerical simulations are used to optimize the laser resonator design and investigate intracavity pulse evolution.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Lilong Dai, Zinan Huang, Qianqian Huang, Mohammed Al Araimi, Aleksey Rozhin, Xindong Liang, Chengbo Mou
Summary: Using the interference photonics technique, the phase difference is converted into frequency by superimposing two pulse trains on a detector. The bandwidth of the beat note can be significantly narrower compared to single-mode frequency combs, reaching as low as 0.17 Hz. Consequently, it possesses exceptional sensitivity and precision.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Materials Science, Composites
Yiyin Su, Hanmo Zhou, Xishan Guo, Yinfei Zheng, Xiaohui Yang, Haitao Huang, Li-min Zhou, Zhongqing Su
Summary: In this study, carbon nanotubes (CNTs) were in situ grafted onto glass fiber (GF) via chemical vapor deposition at a low synthesis temperature (500 degrees C). By regulating the mass fractions of CNTs, the quantum tunneling effect among CNT nanoparticles was triggered, resulting in high sensitivity of the CNT-grafted GF textiles to structure-guided ultrasonic waves in the frequency range from 175 to 375 kHz. The CNT-grafted GF textiles demonstrated great potential in developing hybrid functional composites, with negligible degradation in mechanical attributes as confirmed by ASTM-complied tests (ASTM C1557 and D3039).
COMPOSITES COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Juntao Li, Jinbo Liu, Dong Liu, Wenming Tian, Shengye Jin, Shu Hu, Jingwei Guo, Yuqi Jin
Summary: A secure optical ultrafast random number generator based on random laser spectra was demonstrated in this work. The random laser spectrum under each pump pulse was recorded and converted into random numbers through post-processing. Approaches in three different dimensions-space, spectrum and time were used to increase the rate of random number generation. The randomness of resulting random bit streams was verified by the NIST statistics tests. Experimental results showed that an instantaneous bit rate of 810 terabits per second could be theoretically reached with an ideal experimental condition.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Min Luo, Ze-Xian Zhang, Meng Liu, Ai-Ping Luo, Wen-Cheng Xu, Zhi-Chao Luo
Summary: This study reports the observation of dissipative rogue wave (DRW) generation induced by single and multi-soliton explosions in a passively mode-locked fiber laser. The DRWs were identified by analyzing the peak intensity statistics of the time-stretched soliton profiles.
Article
Optics
Maria Michalska
Summary: This study demonstrates intracavity dispersion management in a passively mode-locked thulium-doped all-fiber laser, utilizing a nonlinear optical loop mirror (NOLM) saturable absorber. It successfully generated Gaussian pulses with a duration of 253 fs and fundamental solitons in the soliton mode-locking regime, achieving the shortest fundamental soliton from a thulium-doped fiber laser with all anomalous dispersion reported to date.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
Bo Ren, Can Li, Tao Wang, Kun Guo, Jian Wu, Rongtao Su, Pengfei Ma, Pu Zhou
Summary: A gain-managed nonlinear tapered fiber amplifier with a monolithic configuration was experimentally demonstrated. Both forward and backward pumping schemes were studied, and the results showed that the backward pumping scheme is advantageous in suppressing unwanted stimulated Raman scattering and mode distortion, while boosting the pulse energy. A maximum single pulse energy of 707 nJ and a peak power of 11 MW were achieved without temporally stretching the seed pulse. The combination of gain-managed amplification and large mode area tapered fiber provides a promising scheme for high energy ultrafast lasers with a monolithic and concise structure.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Chen Xie, Remi Meyer, Luc Froehly, Remo Giust, Francois Courvoisier
Summary: Ultrafast imaging techniques are crucial in physics and chemistry, but the lack of characterization of weak probe beams hinders progress towards high spatial resolution. A pump-induced micro-grating generated from the electronic Kerr effect can provide a detailed in-situ characterization of weak probe pulses, solving issues such as absolute pump-probe delay determination and pulse-front tilt detection. This non-destructive and fast probe diagnostic technique is applicable to all wavelengths and polarizations, enabling previously inaccessible spatiotemporal imaging in various fields of ultrafast science.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Article
Optics
Aoran Feng, Bowen Liu, Dongyu Yan, Genyu Bi, Youjian Song, Minglie Hu
Summary: By changing the transmission coefficient of the output mirror, the pump power, and the ratio of the net cavity dispersion to the net third-order dispersion, the wavelength and energy of the sidebands in a mode-locked fiber laser can be tuned. Optimization of these parameters allows the generation of a sideband-free Gaussian-shaped spectrum with a 13.56nm bandwidth at -0.0232 ps2 net cavity dispersion, corresponding to a 153-fs pulse duration.
CHINESE OPTICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Handing Xia, Han Zhang, Junwen Zheng, Jianbin Li, Mengqiu Fan, Dandan Zhou, Xiaocheng Tian, Zhimeng Huang, Fan Zhang, Rui Zhang, Jiangang Zheng, Ping Li, Zhitao Peng, Qihua Zhu
Summary: This paper reports the first observation of the transformation from stretched pulses to dissipative solitons in an all-polarization-maintaining dispersion-managed mode-locked Yb fiber laser. Real-time temporal and spectral dynamics of transient behaviors from pulse breaking to pulse recovering are identified using the time-stretch dispersive Fourier transform technique. The experimental observations are validated by numerical simulations and provide insights into the understanding of transient nonlinear dynamics in ultrafast fiber lasers.
RESULTS IN PHYSICS
(2023)
Article
Optics
Chengliang Zhu, Lei Wang, Hua Zhao, Zhenhao Bing, Yong Zhao, Hongpu Li
Summary: A novel method for producing an ultrabroad dual-triangular filter through an optimized phase-modulated helical long-period fiber grating has been proposed and demonstrated numerically. The filter operates near the dispersion-turning-point of cladding-mode LP1,10, achieving four linear spectral regions with dynamic ranges of approximately 177 nm in wavelength and about 82% transmission loss. These results are the best reported among all grating-based triangular filters and are expected to have potential applications in broadband power-interrogated fiber sensing systems.
OPTICS COMMUNICATIONS
(2022)
Article
Optics
Xiuqi Wu, Junsong Peng, Sonia Boscolo, Ying Zhang, Christophe Finot, Heping Zeng
Summary: Generating pulse from an ultrafast laser is challenging task that involves adjusting multiple control parameters. Machine-learning tools have shown potential for designing smart lasers. The use of evolutionary algorithms for self-optimization of breather regime in fiber lasers opens up a new avenue for exploration and optimization of complex dynamics in nonlinear systems.
LASER & PHOTONICS REVIEWS
(2022)
Article
Education, Scientific Disciplines
Christophe Finot, Sonia Boscolo
Summary: This article describes a research project conducted with undergraduate physics students, aimed at exploring the use of a neural network to study a classic problem in wave optics. The students were able to appreciate the basic steps involved in a machine-learning process through this experience.
EUROPEAN JOURNAL OF PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Ying Zhang, Chunbo Zhao, Xiuqi Wu, Yansong Meng, Jinman Ge, Xiaojun Li, Junsong Peng, Heping Zeng
Summary: This study successfully retrieves the internal phase evolutions of soliton molecules in mode-locked lasers with interference-like spectra, using a novel phase retrieval method. It paves the way for further understanding of various soliton molecule dynamics in ultrafast fiber lasers.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Optics
Sonia Boscolo, Tu T. Nguyen, Abdallah A. Ali, Stylianos Sygletos, Andrew D. Ellis
Summary: The study proposes a kernel-based adaptive filtering method to suppress phase noise in dual-pump fibre-based optical phase conjugation. Experimental and numerical demonstrations show improved signal-to-noise ratio over conventional PN compensation, with no penalty in performance across a range of pump-phase mismatch values. The method is applicable to 64-QAM modulation and its performance is evaluated through numerical simulations in a transmission setup with mid-link OPC.
Article
Optics
Kangwen Yang, Jiaying Li, Jiamei Wu, An Hu, Qiang Hao, Junsong Peng, Kun Huang, Heping Zeng
Summary: In this study, a Yb-doped fiber laser locked by a non-linear amplifying loop mirror (NALM) with a figure-9 configuration is successfully realized. The injection of heterochromic optical pulses leads to a new Q-switched mode-locking (Q-ML) transition state, which significantly reduces the self-starting mode-locking threshold of the laser. The findings provide a new approach for understanding and constructing high-consistency mode-locked fiber lasers with low thresholds.
Article
Multidisciplinary Sciences
Xiuqi Wu, Ying Zhang, Junsong Peng, Sonia Boscolo, Christophe Finot, Heping Zeng
Summary: This article investigates nonlinear systems with two competing frequencies, focusing on breather lasers. It demonstrates frequency locking at Farey fractions and discusses the potential of this phenomenon in synchronization dynamics.
NATURE COMMUNICATIONS
(2022)
Article
Optics
Sonia Boscolo, John M. Dudley, Christophe Finot
Summary: We utilize a supervised machine-learning model based on a neural network to predict the temporal and spectral reshaping of a simple sinusoidal modulation into a pulse train with a comb structure in the frequency domain, resulting from nonlinear propagation in an optical fiber. We study both normal and anomalous second-order dispersion regimes of the fiber, and leverage the speed of the neural network to explore the input parameter space for generating customized combs or significant temporal and spectral focusing.
OPTICS COMMUNICATIONS
(2023)
Article
Optics
Ying Zhang, Xiuqi Wu, Junsong Peng, Heping Zeng
Summary: By extensive numerical simulations, we investigate the existence range of fractal dynamics in mode-locked fibre lasers operating in the breathing soliton regime, varying laser parameters such as the modulation depth of saturable absorbers and the net cavity dispersion. It is found that fractal dynamics can be observed in a relatively large range of laser parameters, indicating the potential of mode-locked lasers as an excellent platform to study fascinating dynamics of fractals.
OPTICS COMMUNICATIONS
(2023)
Article
Optics
Xiuqi Wu, Ying Zhang, Junsong Peng, Sonia Boscolo, Christophe Finot, Heping Zeng
Summary: This study demonstrates the use of genetic algorithms to control extreme events in a fiber laser cavity, allowing for the triggering of wave events with rare statistical properties in the frequency domain and the ability to tailor their intensity.
LASER & PHOTONICS REVIEWS
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
T. T. Nguyen, S. Boscolo, A. A. Ali, M. Tan, T. Zhang, S. Takasaka, R. Sugizaki, S. Sygletos, A. D. Ellis
Summary: Using kernel-based time-series prediction, we were able to suppress phase noise induced by small deviations in a dual-pump optical phase conjugation system. Experimental results showed a 1.5-dB SNR improvement for 16-QAM signals at a 4-degree pump-phase mismatch.
2021 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
T. T. Nguyen, S. Boscolo, A. A. Ali, M. Tan, S. Sygletos, S. Takasaka, R. Sugizaki, A. D. Ellis
Summary: We have developed a new two-stage digital scheme to suppress phase distortion caused by residual pump dithering in dual-pump fiber-based optical phase conjugation of high-order QAM signals, showing over 5-dB improvement in SNR compared to conventional phase-noise compensation at high pump-phase mismatch levels.
2021 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
A. A. Ali, T. T. Nguyen, S. Boscolo, S. Takasaka, R. Sugizaki, A. D. Ellis
Summary: The primary degradations in optical phase conjugation devices have been addressed, reducing the implementation penalty to below 0.2dB and enabling performance improvement in a 400-km long probabilistically shaped 256-QAM transmission system for the first time.
2021 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)
(2021)
