We demonstrate a passively harmonic mode-locked（PHML） fiber laser operating at the L-band using carbon nanotubes polyvinyl alcohol（CNTs-PVA） film. Under suitable pump power and an appropriate setting of the polari...We demonstrate a passively harmonic mode-locked（PHML） fiber laser operating at the L-band using carbon nanotubes polyvinyl alcohol（CNTs-PVA） film. Under suitable pump power and an appropriate setting of the polarization controller（PC）, the 54^（th） harmonic pulses at the L-band are generated with the side mode suppression ratio（SMSR） better than 44 dB and a repetition frequency of 503.37 MHz. Further increasing the pump power leads to a higher frequency of 550 MHz with compromised stability of 38.5 dB SMSR. To the best of our knowledge, this is the first demonstration on the generation of L-band PHML pulses from an Er-doped fiber laser based on CNTs.展开更多
We have demonstrated an all-fiber passively mode locked erbium-doped fiber laser(EDFL) based on graphene–polyvinyl-alcohol film. By watchfully adjusting the polarization controller, two different polarization attract...We have demonstrated an all-fiber passively mode locked erbium-doped fiber laser(EDFL) based on graphene–polyvinyl-alcohol film. By watchfully adjusting the polarization controller, two different polarization attractors, including polarization locked vector solitons and a circular attractor, can be observed. This is first time, to the best of our knowledge, to explore the dynamics polarization attractors exhibited by a vector soliton generated from an EDFL based on graphene.展开更多
We demonstrate a stable conventional soliton in a Tm-doped hybrid mode-locked fiber laser by employing a homemade all-fiber Lyot filter(AFLF) and a single-wall carbon nanotube. The AFLF, designed by sandwiching a piec...We demonstrate a stable conventional soliton in a Tm-doped hybrid mode-locked fiber laser by employing a homemade all-fiber Lyot filter(AFLF) and a single-wall carbon nanotube. The AFLF, designed by sandwiching a piece of polarization-maintained fiber(PMF) with two 45° tilted fiber gratings inscribed by a UV laser in PMF with a phase-mask scanning technique, shows large filter depth of ～9 d B and small insertion loss of ～0.8 dB. By optimizing the free spectral range of the AFLF, the Kelly sidebands of a conventional soliton centered at1966.4 nm can be dramatically suppressed without impairing the main shape of the soliton spectrum. It gives the pulse duration of 1.18 ps and bandwidth of 3.8 nm. By adjusting the temperature of the PMF of the AFLF from 7°C to 60°C, wavelength tunable soliton pulses ranging from 1971.62 nm to 1952.63 nm are also obtained.The generated soliton pulses can be precisely tuned between 1971.62 nm and 1952.63 nm by controlling the temperature of the AFLF.展开更多
We propose and demonstrate a passively harmonic mode-locked erbium-doped fiber laser(EDFL)using carbon nanotubes polyvinyl alcohol(CNTs-PVA)film.The laser allows generation of the pulses with a repetition rate of 580 ...We propose and demonstrate a passively harmonic mode-locked erbium-doped fiber laser(EDFL)using carbon nanotubes polyvinyl alcohol(CNTs-PVA)film.The laser allows generation of the pulses with a repetition rate of 580 MHz,which corresponds to the 22nd harmonics of a 26.3 MHz fundamental repetition rate under 323 mW pump power.A particularly noteworthy feature of the pulses is the super-mode suppression ratio(SMSR),which is over 40 dB,indicating a stable operation.展开更多
Multi-scale methods that separate different time or spatial scales are among the most powerful techniques in physics,especially in applications that study nonlinear systems with noise.When the time scales(noise and pe...Multi-scale methods that separate different time or spatial scales are among the most powerful techniques in physics,especially in applications that study nonlinear systems with noise.When the time scales(noise and perturbation)are of the same order,the scales separation becomes impossible.Thus,the multi-scale approach has to be modified to characterise a variety of noise-induced phenomena.Here,based on stochastic modelling and analytical study,we demonstrate in terms of the fluctuation-induced phenomena and Hurst R/S analysis metrics that the matching scales of random birefringence and pump–signal states of polarisation interaction in a fibre Raman amplifier results in a new random birefringence-mediated phenomenon,which is similar to stochastic anti-resonance.The observed phenomenon,apart from the fundamental interest,provides a base for advancing multi-scale methods with application to different coupled nonlinear systems ranging from lasers(multimode,mode-locked,random,etc.)to nanostructures(light-mediated conformation of molecules and chemical reactions,Brownian motors,etc.).展开更多
基金Project supported by the National Natural Science Foundation of China(Grant No.61605107)Young Eastern Scholar Program at Shanghai Institutions of Higher Learning,China(Grant No.QD2015027)+2 种基金the“Young 1000 Talent Plan”Program of Chinathe Open Program of the State Key Laboratory of Advanced Optical Communication Systems and Networks at Shanghai Jiaotong University,China(Grant No.2017GZKF17)RAEng/The Leverhulme Trust Senior Research Fellowships(Grant No.LTSRF1617/13/57).
文摘We demonstrate a passively harmonic mode-locked（PHML） fiber laser operating at the L-band using carbon nanotubes polyvinyl alcohol（CNTs-PVA） film. Under suitable pump power and an appropriate setting of the polarization controller（PC）, the 54^（th） harmonic pulses at the L-band are generated with the side mode suppression ratio（SMSR） better than 44 dB and a repetition frequency of 503.37 MHz. Further increasing the pump power leads to a higher frequency of 550 MHz with compromised stability of 38.5 dB SMSR. To the best of our knowledge, this is the first demonstration on the generation of L-band PHML pulses from an Er-doped fiber laser based on CNTs.
基金the National Natural Science Foundation of China(NSFC)(No.61605107)the Young Eastern Scholar Program at Shanghai Institutions of Higher Learning(No.QD2015027)+3 种基金the Young1000 Talent Plan Program of ChinaOpen Program of the State Key Laboratory of Advanced Optical Communication Systems and Networks at Shanghai Jiao Tong University,China(No.2017GZKF17)the Open Fund of IPOC2017B010(BUPT)RAEng/Leverhulme Trust Senior Research Fellowships(LTSRF1617/13/57)
文摘We have demonstrated an all-fiber passively mode locked erbium-doped fiber laser(EDFL) based on graphene–polyvinyl-alcohol film. By watchfully adjusting the polarization controller, two different polarization attractors, including polarization locked vector solitons and a circular attractor, can be observed. This is first time, to the best of our knowledge, to explore the dynamics polarization attractors exhibited by a vector soliton generated from an EDFL based on graphene.
基金National Natural Science Foundation of China(NSFC)(614350003,61722503,61421002)Open Fund of Science and Technology on Solid-State Laser Laboratory+2 种基金Fundamental Research Funds for the Central Universities(ZYGX2016J068)International Scientific Cooperation Project of Sichuan Province(2017HH0046)Joint Fund of Ministry of Education for Equipment Pre-research(6141A02033411)
文摘We demonstrate a stable conventional soliton in a Tm-doped hybrid mode-locked fiber laser by employing a homemade all-fiber Lyot filter(AFLF) and a single-wall carbon nanotube. The AFLF, designed by sandwiching a piece of polarization-maintained fiber(PMF) with two 45° tilted fiber gratings inscribed by a UV laser in PMF with a phase-mask scanning technique, shows large filter depth of ～9 d B and small insertion loss of ～0.8 dB. By optimizing the free spectral range of the AFLF, the Kelly sidebands of a conventional soliton centered at1966.4 nm can be dramatically suppressed without impairing the main shape of the soliton spectrum. It gives the pulse duration of 1.18 ps and bandwidth of 3.8 nm. By adjusting the temperature of the PMF of the AFLF from 7°C to 60°C, wavelength tunable soliton pulses ranging from 1971.62 nm to 1952.63 nm are also obtained.The generated soliton pulses can be precisely tuned between 1971.62 nm and 1952.63 nm by controlling the temperature of the AFLF.
基金supported by the National Natural Science Foundation of China(NSFC)(No.61605107)the Young Eastern Scholar Program at Shanghai Institutions of Higher Learning(No.QD2015027)+3 种基金the“Young 1000 Talent Plan”Program of Chinasupport from the Ministry of Higher Education,Sultanate of OmanMarie Sklodowask-Curie IEF project(H2020-MSCA-IF-2014_ST,Proposal#:656984)Marie-Curie International Research Staff Exchange Scheme“Tela Sens”project,Research Executive Agency(Grant No.269271,Programme:FP7-PEOPLE-2010-IRSES)
文摘We propose and demonstrate a passively harmonic mode-locked erbium-doped fiber laser(EDFL)using carbon nanotubes polyvinyl alcohol(CNTs-PVA)film.The laser allows generation of the pulses with a repetition rate of 580 MHz,which corresponds to the 22nd harmonics of a 26.3 MHz fundamental repetition rate under 323 mW pump power.A particularly noteworthy feature of the pulses is the super-mode suppression ratio(SMSR),which is over 40 dB,indicating a stable operation.
文摘Multi-scale methods that separate different time or spatial scales are among the most powerful techniques in physics,especially in applications that study nonlinear systems with noise.When the time scales(noise and perturbation)are of the same order,the scales separation becomes impossible.Thus,the multi-scale approach has to be modified to characterise a variety of noise-induced phenomena.Here,based on stochastic modelling and analytical study,we demonstrate in terms of the fluctuation-induced phenomena and Hurst R/S analysis metrics that the matching scales of random birefringence and pump–signal states of polarisation interaction in a fibre Raman amplifier results in a new random birefringence-mediated phenomenon,which is similar to stochastic anti-resonance.The observed phenomenon,apart from the fundamental interest,provides a base for advancing multi-scale methods with application to different coupled nonlinear systems ranging from lasers(multimode,mode-locked,random,etc.)to nanostructures(light-mediated conformation of molecules and chemical reactions,Brownian motors,etc.).
