Article
Optics
Yueqing Du, Chao Zeng, Zhiwen He, Qun Gao, Dong Mao
Summary: In this study, we revealed the coherent dissipative soliton intermittency in normal-dispersion fiber lasers based on real-time spectroscopy. By increasing the pump strength, the intermittency transforms from transient pulsation to bi-stable soliton, with the slow-gain effect dominating such coherent intermittency.
CHINESE OPTICS LETTERS
(2022)
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
Mingming Nie, Bowen Li, Kunpeng Jia, Yijun Xie, Jingjie Yan, Shining Zhu, Zhenda Xie, Shu-Wei Huang
Summary: Optical frequency combs in microresonators have great potential for various applications. However, conventional soliton microcombs have some limitations. By nesting a microresonator into a fiber cavity, these limitations can be overcome, resulting in high-efficiency and self-starting microcombs.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Yuhang Shi, Zhigang Peng, Zhaochen Cheng, Tong Xia, He Zhao, Shuangqin Wan, Pu Wang
Summary: The Yb-doped fiber laser presented in the letter features dispersion management and compensation techniques, delivering stable high-power and short-pulse output, with a compact and stable structure.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Optics
Fatkhulla Kh Abdullaev, Sadulla Sh. Tadjimuratov, Abdulaziz A. Abdumalikov
Summary: We studied the dynamics of localized pulses in the complex cubic-quintic Ginzburg-Landau equation with strong nonlinearity management. The generalized complex GL equation, averaged over rapid modulations of the nonlinearity, was derived. Using numerical simulations, we showed the existence of nonlinearity-managed dissipative solitons in the model and obtained the parameter regions for stabilizing exploding solitons.
Article
Optics
Philippe Grelu
Summary: This article presents the development of the connections between ultrafast laser dynamics and solitary waves concepts, highlighting the crucial role of fiber lasers in advancing research in this field.
OPTICS COMMUNICATIONS
(2024)
Article
Engineering, Electrical & Electronic
Kangjun Zhao, Xiaosheng Xiao, Changxi Yang
Summary: This paper numerically investigates the soliton dynamics in mode-locked fiber lasers based on sinusoidal spectral filtering (SSF). It is found that SSF can facilitate the formation of dual-wavelength mode locking and generate dual-comb solitons with slightly different group velocities. Moreover, pulse shaping based on SSF and gain filtering leads to a non-monotonic relationship between the group velocity difference of the solitons and the cavity gain. Additionally, dual-comb soliton mode locking exhibits a threshold feature and multi-pulse instability.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
Article
Optics
Liqiang Zhang, Yicun Yao, Xiaohui Li, Nan-Kuang Chen, Chenglin Bai, Fan Yang, Zhen Tian, Yingying Ren, Minghong Wang
Summary: By exploiting the reflect pulse from the polarization beam splitter, we have successfully achieved synchronously mode-locked dual-wavelength dissipative sub-pulses in a Yb-doped passively mode-locked fiber laser. Numerical simulation and experimental results demonstrate the unique behavior of these dual-wavelength pulses and the ability to control the central wavelengths and interval by adjusting the cavity parameters.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Jintao Qiu, Zhiguo Lv, Xiaohui Li, Shan Wang
Summary: We propose a high-average-power laser configuration that can simultaneously generate dissipative solitons (DSs) and synchronous dual-wavelength mode-locked (ML) pulses. This is achieved through the use of large-mode-area (LMA) fibers along with a birefringence-based chirped-pulse spectral filter. This configuration allows for the generation of DSs with average power up to 5.8W and pulse width as short as 178fs, as well as synchronous dual-wavelength ML pulses with average power up to 1.5W at central wavelengths of 1029.7nm and 1046.1nm respectively. To the best of our knowledge, this simultaneous observation of DSs and synchronous dual-wavelength pulses has not been achieved in watt-level fiber lasers.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Optics
M. Duran-Sanchez, B. Posada-Ramirez, R. alvarez-Tamayo, M. Bello-Jimenez, Y. A. Garcia-Flores, I Armas-Rivera, E. Montiel-Pina, E. A. Kuzin, B. Ibarra-Escamilla
Summary: In this experimental study, switchable rectangular pulses were generated in a passively mode-locked double-clad thulium-doped fiber laser operating in the anomalous dispersion regime. The laser utilizes a fiber loop mirror and a polarization imbalanced nonlinear optical loop mirror (NOLM) to form a linear cavity, with the loop in the NOLM allowing switching between two regimes of rectangular pulse generation. The laser is capable of generating rectangular noise-like pulses (NLPs) or dissipative soliton resonance (DSR) pulses with 1.18 MHz repetition rate at around 1990 nm.
Article
Optics
Yulong Tang, Feng Li, Xuechao Yu
Summary: This study demonstrates a dual-wavelength harmonic mode-locked DSR ytterbium-doped fiber laser using a semiconductor saturable absorber mirror. By adjusting the feedback conditions, the laser can transition from fundamental frequency mode locking to harmonic mode locking with multiple orders. The unique features of DSR mode locking are maintained throughout the transition. This fiber laser has great potential for various applications.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
Tiegang Guo, Zhaokun Wang, Feng Gao, Chunliu Zhao, Shuo Chang, Xuebin Zhang
Summary: This letter reports the experimental realization of spatiotemporal mode-locked operation in a hybrid all-fiber Er-doped laser cavity. The mode locking of longitudinal or transverse modes is achieved by changing the state of polarization controller or multimode fiber segment. Different types of multimode solitons are generated at ~ 1560 nm by adjusting the polarization controller. The study shows that the beam profiles are determined by the state of multimode fiber segment, which is different from previous research in full-MM fiber system.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Xin Li, Tianshu Wang, Wanzhuo Ma, Lei Du, Hang Ren, Lin Xiao
Summary: In this study, a 2.1 μm band mode-locked holmium-doped fiber laser with tunable wavelength and pulse width in the dissipative soliton resonance region was reported. The mode-locking operation was achieved using a nonlinear-amplifying-loop-mirror structure with net anomalous dispersion. The pulse duration could be adjusted by increasing the pump power, while maintaining a constant peak power. The central wavelength was tunable by appropriately adjusting the polarization controllers. The nonlinear correlation characteristic of the dissipative soliton resonance pulse was also explored by changing the length of the high nonlinear fiber.
IEEE PHOTONICS JOURNAL
(2022)
Article
Multidisciplinary Sciences
Jing Zhang, Bo Peng, Seunghwi Kim, Faraz Monifi, Xuefeng Jiang, Yihang Li, Peng Yu, Lianqing Liu, Yu-xi Liu, Andrea Alu, Lan Yang
Summary: The observation of mechanical micro-solitons excited by optical fields in an optomechanical microresonator has opened up new possibilities for optomechanical technologies. By balancing optomechanical nonlinearities with a tailored modal dispersion, stable, dissipative optomechanical solitons have been realized in a whispering gallery mode resonator.
Article
Optics
Zhiqiang Wang, Aurelien Coillet, Said Hamdi, Zuxing Zhang, Philippe Grelu
Summary: Period doubling is a universal bifurcation phenomenon that indicates the existence of chaotic dynamics in the vicinity of system parameters. This article presents a variety of bifurcation sequences related to spectral pulsations in dissipative solitons, using real-time spectral characterization techniques and numerical simulations. The experiments show that self-phase modulation triggers period-2 bifurcations, and ramping up the pump power leads to more complex bifurcations and entrainment phenomena. These findings provide a general understanding of period-doubling bifurcations in ultrafast laser systems and their combinations with complex bifurcations observable from the spectral domain.
LASER & PHOTONICS REVIEWS
(2023)
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
Engineering, Electrical & Electronic
Pedro J. Freire, Antonio Napoli, Bernhard Spinnler, Michael Anderson, Diego Arguello Ron, Wolfgang Schairer, Thomas Bex, Nelson Costa, Sergei K. Turitsyn, Jaroslaw E. Prilepsky
Summary: This paper introduces a new method for developing low-complexity neural network (NN) based equalizers for high-speed coherent optical transmission systems. Deep model compression techniques applied to feed-forward and recurrent NN designs are explored and compared, with a focus on their impact on equalizer performance. A Bayesian optimization-assisted compression approach is proposed and evaluated, optimizing hyperparameters to simultaneously enhance performance and reduce complexity. Additionally, metrics are introduced to quantify computing complexity in various compression algorithms, serving as benchmarks for evaluating the effectiveness of NN equalizers with compression. The trade-off between compression complexity and performance is evaluated using simulated and experimental data.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Computer Science, Hardware & Architecture
Mohammad Mohammad Hosseini, Joao Pedro, Antonio Napoli, Nelson Costa, Jaroslaw E. Prilepsky, Sergei K. Turitsyn
Summary: This paper proposes an integer linear programming framework for optimizing multi-period planning of metro-aggregation networks. Using point-to-multipoint coherent pluggable transceivers and a filterless line system architecture, the planning strategies aim to minimize capital expenditure caused by transceiver cost while considering operational expenses. The results show significant reductions in transceiver cost and operational expenses compared to the point-to-point approach.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2023)
Article
Optics
Aleksandr Donodin, Uiara Celine de Moura, Ann Margareth Rosa Brusin, Egor Manuylovich, Vladislav Dvoyrin, Francesco Da Ros, Andrea Carena, Wladek Forysiak, Darko Zibar, Sergei K. Turitsyn
Summary: Bismuth-doped fiber amplifiers are an attractive solution for increasing bandwidth demand in modern communication systems. A new approach using a neural network trained with experimental data sets in E- and S-bands has been proposed to develop a bismuth-doped fiber amplifier model. This approach allows for robust prediction of amplifier operation, considering variations in fiber properties and amplifier characteristics fluctuations. The spectral dependencies of gain and noise figure for given pump currents and input signal powers have been obtained, achieving low mean and standard deviation of error in the 1410-1490 nm spectral band.
JOURNAL OF THE EUROPEAN OPTICAL SOCIETY-RAPID PUBLICATIONS
(2023)
Article
Optics
Vladislav Neskorniuk, Andrea Carnio, Domenico Marsella, Sergei K. Turitsyn, Jaroslaw E. Prilepsky, Vahid Aref
Summary: We propose a new variant of end-to-end learning approach to enhance the performance of optical coherent-detection communication system. The solution involves learning the joint probabilistic and geometric shaping of symbol sequences through auxiliary channel model based on perturbation theory and refined symbol probabilities training. The auxiliary channel model based on first order perturbation theory allows efficient parallelizable model application and accurate channel approximation. Experimental results show a significant bit-wise mutual information gain of 0.47 bits/2D-symbol for the learned multi-symbol joint probabilistic and geometric shaping compared to conventional Maxwell-Boltzmann shaping in a single-channel 64 GBd transmission through 170 km single-mode fiber link.
Article
Optics
Sergei K. Turitsyn
Summary: The path-averaged model is utilized to analyze the soliton properties in the anomalous cavity dispersion fiber laser with a semiconductor optical amplifier. The experimental results demonstrate that by offsetting the optical filter relative to the gain spectral maximum, it is feasible to manipulate the velocity and frequency of both the fundamental optical soliton and chirped dissipative solitons.
Article
Mathematics, Applied
Stepan Bogdanov, Dmitry Shepelsky, Anastasiia Vasylchenkova, Egor Sedov, Pedro J. Freire, Sergei K. Turitsyn, Jaroslaw E. Prilepsky
Summary: We develop a method for retrieving the parameters of a quasi-periodic finite-genus solution to the nonlinear Schrodinger equation. The method utilizes convolutional neural networks optimized by Bayesian optimization to identify the best set of network hyperparameters.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2023)
Article
Engineering, Electrical & Electronic
Pedro J. Freire, Sasipim Srivallapanondh, Michael Anderson, Bernhard Spinnler, Thomas Bex, Tobias A. Eriksson, Antonio Napoli, Wolfgang Schairer, Nelson Costa, Michaela Blott, Sergei K. Turitsyn, Jaroslaw E. Prilepsky
Summary: In this work, FPGA realization of neural network-based equalizers for compensating nonlinearity in coherent optical transmission systems is demonstrated. The models are converted from Python libraries to FPGA synthesis and implementation. Different hardware implementation alternatives for nonlinear activation functions are reviewed. Performance comparison, implementation analysis, and hardware complexity are discussed. The experiments show that the biLSTM+CNN equalizer achieves similar results to DBP and provides a Q-factor gain compared to the baseline. Approximations of activation functions using Taylor series, piecewise linear, and look-up table are evaluated in terms of Q-factor and hardware utilization.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Computer Science, Hardware & Architecture
Mohammad M. Hosseini, Joao Pedro, Antonio Napoli, Nelson Costa, Jaroslaw E. Prilepsky, Sergei K. Turitsyn
Summary: This paper proposes an integer linear programming framework to optimize metro-aggregation filterless horseshoe networks, taking into account the specific requirements of DSCM-based P2MP coherent transceivers. The results indicate that a considerable reduction in amplifier count is possible while ensuring that end-to-end performance thresholds are met.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2023)
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
Physics, Multidisciplinary
S. K. Turitsyn, A. E. Bednyakova, E. Podivilov
Summary: This study introduces a generic novel model for the propagation of optical pulses in a nonlinear dispersive amplifying medium with asymmetric gain. The properties of asymmetric optical pulses formed in such gain-skewed media are examined theoretically and numerically. A dissipative optical modification of the classical shallow water equations is derived, highlighting the analogy between this phenomenon and hydrodynamic wave breaking. These findings provide insight into the nature of asymmetric optical pulses capable of accumulating large nonlinear phase without wave breaking, which is crucial for the design of nonlinear fiber amplifiers.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Boris Nyushkov, Aleksey Ivanenko, Sergey Smirnov, Sergey Turitsyn
Summary: This paper proposes a method for the synchronous generation of bicolor, high-repetition-rate pulses using Yb rare-earth ions and Raman scattering in a shared all-fiber laser cavity. The proposed approach solves the problem of compensating for the dispersion-induced differential delay of bi-chromatic pulses during an intracavity round trip and enables the stable generation of sub-nanosecond bi-chromatic pulses. This method is expected to facilitate more affordable bi-chromatic pulse generation in various laser systems.
Proceedings Paper
Engineering, Electrical & Electronic
Mohammad M. Hosseini, Joao Pedro, Antonio Napoli, Nelson Costa, Jaroslaw E. Prilepsky, Sergei K. Turitsyn
Summary: This article presents an optimization framework tailored for the deployment of point-to-multipoint (P2MP) transceivers in metro-aggregation networks. The study demonstrates that P2MP transceivers can save costs compared to point-to-point (P2P) transceivers when considering both transceivers and amplifiers.
2023 INTERNATIONAL CONFERENCE ON PHOTONICS IN SWITCHING AND COMPUTING, PSC
(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
Telecommunications
Mohammad M. Hosseini, Joao Pedro, Antonio Napoli, Nelson Costa, Jaroslaw E. Prilepsky, Sergei K. Turitsyn
Summary: Emerging applications are driving traffic requirements to new heights, especially in urban areas. Traditional optical solutions are not suitable for the communication needs between hub and leaf nodes in aggregation networks. A novel optical technology can address this issue, reducing transceiver expenditures through optimized designs.
IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC 2022)
(2022)
