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Chinese Physics B 2008年第3期17卷 1000-1007页

作者：冯传奋伍剑张君毅徐坤林金桐 The Key Laboratory of Optical Communication and Lightwave Technologies of MOE Beijing University of Posts and Telecommunications

Taking into account ultra-fast carrier dynamics, this paper models 640 Gbit/s wavelength conversion scheme based on nonlinear polarization rotation （NPR） in a single semiconductor optical amplifier （SOA） and investigates the performance of this kind of wavelength conversion scheme in detail. In this model, two carrier temperature equations are introduced to substitute two energy density equations, which reduce the complexity of calculation in comparison with the previous model. The temporary gain and phase shift dynamics induced by ultra-short optical pulses are numerically simulated and the simulated results are qualitatively in good agreement with reported experimental results. Simulated results show that non-inverted and inverted 640 Gbit/s wavelength conversions based on NPR are achieved with clear open eye diagrams. To further investigate the performance of the non-inverted wavelength conversion scheme, the dependence of output extinction ratio （ER） on some key parameters used in simulation is illustrated. Furthermore, simulated analyses show that high performance non-inverted wavelength conversion based on NPR can be achieved by using a red-shifted filtering scheme.

关键词： all-optical wavelength conversion nonlinear polarization rotation semiconductor optical amplifier ultra-fast carrier dynamics

All-Optical Sampling Using nonlinear polarization rotation in a Single Semiconductor Optical Amplifier

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Journal of Semiconductors 2008年第6期29卷 1031-1035页

作者：张尚剑张谦述李和平刘永智刘永宽带光纤传输与通信教育部重点实验室电子科技大学光电信息学院成都610054

We propose a novel all-optical sampling method using nonlinear polarization rotation in a semiconductor optical amplifier. A rate-equation model capable of describing the all-optical sampling mechanism is presented in this paper. Based on this model, we investigate the optimized operating parameters of the proposed system by simulating the output intensity of the probe light as functions of the input polarization angle, the phase induced by the polarization controller, and the ori- entation of the polarization beam splitter. The simulated results show that we can obtain a good linear slope and a large linear dynamic range,which is suitable for all-optical sampling. The operating power of the pump light can be less than lmW. The presented all-optical sampling method can potentially operate at a sampling rate up to hundreds GS/s and needs low optical power.

关键词： optical signal processing all-optical sampling semiconductor optical amplifier nonlinear polarization rotation

Automatic mode-locking fiber lasers: progress and perspectives

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Science China(Information Sciences) 2020年第6期63卷 119-142页

作者： Guoqing PU Li ZHANG Weisheng HU Lilin YI State Key Lab of Advanced Communication Systems and Networks Shanghai Institute for Advanced Communication and Data Science Shanghai Jiao Tong University

polarization control in nonlinear polarization rotation based mode-locked fiber lasers is a longterm challenge. Suffering from the polarization drifts induced by environmental disturbances, nonlinear polarization rotation based mode-locked fiber lasers is difficult in continuously operating under the desired pulsation regime thereby substantially hindering their utilizations. The appearance of automatic modelocking techniques brings the light in addressing this challenge. Combining with various algorithms and electrical polarization control, automatic mode-locking techniques resolve the dilemma of nonlinear polarization rotation based mode-locked fiber lasers. We review the research progress of automatic mode-locking techniques in detail. Furthermore, we comment on the perspectives and potential applications of automatic mode-locking techniques.

关键词： nonlinear polarization rotation ultrashort pulses automatic mode-locking electrical polarization control optimization algorithms machine learning time stretch

A theoretical and experimental study on all-normal-dispersion Yb-doped mode-locked fiber lasers

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Chinese Physics B 2013年第4期22卷 268-273页

作者：池俊杰李平雪杨春赵自强李尧王雄飞钟国舜赵鸿姜东升 Institute of Laser Engineering Beijing University of Technology Science and Technology on Solid-State Laser Laboratory

We report on a theoretical and experimental study of an all-normal-dispersion （ANDi） Yb-doped mode-locked fiber laser, in which nonlinear polarization rotation （NPR） is used to realize mode-locking without any dispersion compensation. Based on the coupled nonlinear Schr6dinger （CNLS） equation, a model simulating the mode-locked process of an all-normal-dispersion ring fiber laser is developed, which shows that the achievement of stable mode-locking depends on the alignment of the polarization controller （PC） along the fast-polarization axis of the fiber, the birefringence intensity, and the net cavity dispersion. According to the theoretical analysis, stable mode-locked pulses with pulse duration 300 ps and average output power 33.9 mW at repetition rate 36 MHz are obtained.

关键词： all-normal-dispersion nonlinear polarization rotation mode-locked Yb-doped fiber laser

Transition state to mode locking in a passively mode-locked erbium-doped fibre ring laser

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Chinese Physics B 2011年第5期20卷 255-260页

作者：刘佳锐徐文成罗智超罗爱平殷海森 Key Laboratory of Photonic Information Technology of Guangdong Higher Education Institutes School of Information and Optoelectronic Science and EngineeringSouth China Normal University

The transition state between the continuous wave region and the mode-locked region in a passively mode-locked erbium-doped fibre ring laser has been experimentally observed by utilizing the nonlinear polarization rotation technique. When the pump power reaches the mode-locked threshold, the metastable pulse train with a tunable repetition rate is obtained in the transition from the continuous wave state to the passive mode-locked state via proper adjustment of the polarization controller. A simpie model has been established to explain the experimental observation.

关键词： transition state erbium-doped fibre laser mode locking nonlinear polarization rotation

Generation of cavity-birefringence-dependent multi-wavelength bright-dark pulse pair in a figure-eight thulium-doped fiber laser

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Chinese Physics B 2021年第5期30卷 390-394页

作者： Xiao-Fa Wang Dong-Xin Liu Hui-Hui Han Hong-Yang Mao Key Laboratory of Optical Fiber Communication Technology Chongqing Education CommissionSchool of Optoelectronic EngineeringChongqing University of Posts and TelecommunicationsChongqing 400065China

We experimentally demonstrated a stable multi-wavelength bright-dark pulse pair in a mode-locked thulium-doped fiber laser(TDFL).The nonlinear polarization rotation(NPR)and nonlinear optical loop mirror(NOLM)were employed in a figure-eight cavity to allow for multi-wavelength mode-locking *** incorporating different lengths of high birefringence polarization-maintaining fiber(PMF),the fiber laser could operate stably in a multi-wavelength emission *** with the absence of the PMF,the birefringence effect caused by PMF resulted in rich multi-wavelength optical spectra and better intensity symmetry and stability of the bright-dark pulse pair.

关键词： bright-dark pulse pair nonlinear polarization rotation fiber laser polarization-maintaining fiber

Generation of 12th order harmonic mode-locking in a Nd-doped single-mode all-fiber laser operating at 0.9μm

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Chinese Optics Letters 2023年第1期21卷 97-103页

作者：张斌李平刘兆军李明刘靖赵浩旭胡琼宇陈晓寒 Center for Optics Research and Engineering Key Laboratory of Laser&Infrared SystemMinistry of EducationShandong UniversityQingdao 266237China School of Information Science and Engineering Shandong Provincial Key Laboratory of Laser Technology and ApplicationShandong UniversityQingdao 266237China

Based on the Nd-doped single-mode fiber as the gain medium,an all-fiber 12th harmonic mode-locked(HML)laser operating at the 0.9μm waveband was obtained for the first time,to the best of our knowledge.A mandrel with a diameter of 10 mm was employed to introduce bending losses to suppress mode competition at 1.06μm,which resulted in a suppression ratio of up to 54 *** 1st–12th order HML pulses with the tunable repetition rate of 494.62 kHz–5.94 MHz were obtained in the mode-locked laser with a center wavelength of∼904 *** addition,the laser has an extremely low threshold pump power of 88 *** the best of our knowledge,this is the first time that an HML pulse has been achieved in a 0.9μm Nd-doped single-mode all-fiber mode-locked laser with the advantages of low cost,simple structure,and compactness,which could be an ideal light source for two-photon microscopy.

关键词： Nd-doped fiber laser harmonic mode-locking bending loss nonlinear polarization rotation low repetition rate

Study of All-Optical Sampling Using a Semiconductor Optical Amplifier

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Photonic Sensors 2017年第1期7卷 37-43页

作者： Chen WU Yongjun WANG Lina WANG Fu WANG School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing 100876 China

All-optical sampling is an important research content of all-optical signal processing. In recent years, the application of the semiconductor optical amplifier （SOA） in optical sampling has attracted lots of attention because of its small volume and large nonlinear coefficient. We propose an optical sampling model based on nonlinear polarization rotation effect of the SOA. The proposed scheme has the advantages of high sampling speed and small input pump power, and a transfer curve with good linearity was obtained through simulation. To evaluate the performance of sampling, we analyze the linearity and efficiency of sampling pulse considering the impact of pulse width and analog signal frequency. We achieve the sampling of analog signal to high frequency pulse and exchange the positions of probe light and pump light to study another sampling.

关键词： All-optical sampling semiconductor optical amplifier nonlinear polarization rotation

Recent progress in multi-wavelength fiber lasers:principles,status,and challenges

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Chinese Optics Letters 2020年第4期18卷 36-62页

作者： Hualong Chen Xiantao Jiang Shixiang Xu Han Zhang SZU-NUS Collaborative Innovation Center for Optoelectronic Science&Technology Collaborative Laboratory of 2D Materials for Optoelectronic Science and Technology of Ministry of EducationCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China

In recent years,multi-wavelength fiber lasers play a significant role in plenty of fields,ranging from optical communications to mechanical processing and laser biomedicine,owing to their high beam quality,low cost,and excellent heat dissipation *** from increasing maturity of optical elements,the multi-wavelength fiber laser has made rapid *** this review,we summarize and analyze diverse implementation methods covering continuous wave and pulsed fiber lasers at room temperature conditions:inserting an optical filter device and intensity-dependent loss structure in the resonant cavity,and applying ultrafast nonlinear optical response of materials and a dual-cavity ***,future challenges and perspectives of the multi-wavelength fiber laser are discussed and addressed.

关键词： multi-wavelength fiber laser optical filter nonlinear polarization rotation nonlinear amplification loop mirror 2D materials

Dissipative soliton breathing dynamics driven by desynchronization of orthogonal polarization states

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Advanced Photonics Nexus 2023年第6期2卷 65-82页

作者： Zhiwei Huang Sergey Sergeyev Qing Wang Hani Kbashi Dmitrii Stoliarov Qianqian Huang Yuze Dai Zhijun Yan Chengbo Mou Shanghai University Shanghai Institute for Advanced Communication and Data ScienceKey Laboratory of Specialty Fiber Optics and Optical Access NetworksJoint International Research Laboratory of Specialty Fiber Optics and Advanced CommunicationsShanghaiChina Aston University Aston Institute of Photonic TechnologiesBirminghamUnited Kingdom Huazhong University of Science and Technology School of Optical and Electronic Information and NGIAWuhanChina

Breathing solitons,i.e.,dynamic dissipative solitons with oscillating pulse shape and energy caused by different mechanisms of spatiotemporal instabilities,have received considerable interest from the aspects of nonlinear science and potential ***,by far,the study of breathing solitons is still limited within the time scale of hundreds of cavity round trips,which ignores the slow *** fill this lacuna,we theoretically investigate a new type of vector dissipative soliton breathing regime and experimentally demonstrate this concept using mode-locked fiber lasers,which arise from the desynchronization of orthogonal states of polarization(SOPs)in the form of complex oscillations of the phase difference between the *** dynamic evolution of polarization states of the vector breathings solitons takes the form of a trajectory connecting two quasi-equilibrium orthogonal SOPs on the surface of the Poincaré*** dwelling time near each state is on the scale of a tenth of a thousand cavity round trip times that equals the breathing period,which is up to 2 orders of magnitude longer than that for common *** obtained results can reveal concepts in nonlinear science and may unlock approaches to the flexible manipulation of laser waveforms toward various applications in spectroscopy and metrology.

关键词： dissipative solitons polarization dynamics vector soliton breather Q-switched mode locking nonlinear polarization rotation coupled oscillators