检索结果-南通市图书馆

Effects of modulation amplitude and frequency of frequency-modulated fiber lasers on the threshold of the stimulated Brillouin scattering in optical fiber

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2010年第12期8卷 1124-1126页

作者：陈伟孟洲 College of Optoelectronic Science and Engineering National University of Defense Technology

Stimulated Brillouin scattering （SBS） is a key problem with the increasing power of fiber transmission systems. In this letter, a frequency-modulated fiber laser with an ultra-narrow linewidth is chosen as a light source. The SBS threshold is increased from 4.1 to 6.2 mW at 13-MHz frequency modulation amplitude for a 50-km G652 fiber. We also show that the SBS threshold increases with not only the frequency modulation amplitude, but also the modulation frequency. The modulation frequency should be high enough for effective modulation.

关键词： Electric power transmission fiber lasers fibers Frequency modulation Light polarization Light sources Optical fibers Ultrasonics

All-fiber 7 × 1 signal combiner with high beam quality for high-power fiber lasers

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2015年第6期13卷 65-68页

作者：周航陈子伦周旋风侯静陈金宝 College of Optoelectronic Science and Engineering National University of Defense Technology

All-fiber signal combiner is a key component for augmenting the fiber laser power. Presently the reported 7 x 1 signal combiners are all have output fibers with core diameters larger than 100μm. In order to improve the beam quality of the combiner, a fiber with smaller core of 50 μm diameter is chose to be the output fiber. An all-fiber 7 ×1 signal combiner is fabricated with measured power transmission efficiency around 99% for each port. The beam quality is improved and the measured M2 are around 6 which are matched well with the theoretically calculated results.

关键词： fiber lasers

Efficient heat transfer in high-power fiber lasers

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2012年第11期10卷 32-35页

作者：范元媛何兵周军郑寄托代守军赵纯魏运荣楼祺洪 Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques Graduate University of Chinese Academy of Sciences

The maximum output power of fiber lasers limited by the thermal degradation of double-clad fiber coatings is theoretically simulated. We investigated the thermal effects on high-power continuous wave （CW） fiber lasers with a focus on heating at the splice joints as well as on the doped fiber caused by quantum defects. Whether thermal interface materials are used or not, the thermal contact resistances between the fiber and its heat sink are measured separately while using different cooling equipments. Though the thermal management of splices is more difficult than that of active fibers, a temperature increase of 0.019 K/W is obtained for a splice joint into which the pump light launches. The splice joint sustains 3 kW of total passing power.

关键词： fiber lasers Interfaces (materials)

Coherent dissipative soliton intermittency in ultrafast fiber lasers

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2022年第1期20卷 64-68页

作者： Yueqing Du Chao Zeng Zhiwen He Qun Gao Dong Mao Key Laboratory of Light Field Manipulation and Information Acquisition Ministry of Industry and Information TechnologyMOE Key Laboratory of Material Physics and Chemistry under Extraordinary ConditionsShaanxi Key Laboratory of Optical Information TechnologySchool of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi’an 710072China

As a universal phenomenon in nonlinear optical systems,intermittency is usually accompanied by the coherence loss such as soliton explosions in fiber *** on real-time spectroscopy,we revealed the coherent dissipative soliton intermittency in normal-dispersion fiber *** increasing the pump strength,the intermittency transforms from the transient pulsation to the bo-stable *** is demonstrated that the slow-gain effect dominates such coherent *** results provide novel insights into laser physics,offering a promising approach for studying the bi-stable dissipative soliton.

关键词： mode-locked lasers optical solitons fiber lasers

Single-mode output by controlling the spatiotemporal nonlinearities in mode-locked femtosecond multimode fiber lasers

在线全文

学校读者我要写书评

暂无评论

Advanced Photonics 2020年第5期2卷 84-91页

作者： Ugur Tegin Babak Rahmani Eirini Kakkava Demetri Psaltis Christophe Moser Ecole Polytechnique Fédérale de Lausanne Optics LaboratoryLausanneSwitzerland Ecole Polytechnique Fédérale de Lausanne Laboratory of Applied Photonics DevicesLausanneSwitzerland

The performance of fiber mode-locked lasers is limited due to the high nonlinearity induced by the spatial confinement of the single-mode fiber *** massively increase the pulse energy of the femtosecond pulses,amplification is performed outside the ***,spatiotemporal mode-locking has been proposed as a new path to fiber ***,the beam quality was highly multimode,and the calculated threshold pulse energy(>100 nJ)for nonlinear beam self-cleaning was challenging to *** present an approach to reach high energy per pulse directly in the mode-locked multimode fiber oscillator with a near single-mode output *** approach relies on spatial beam self-cleaning via the nonlinear Kerr effect,and we demonstrate a multimode fiber oscillator with M^2fibers up to a certain level of modal dispersion and could benefit applications that require high-power ultrashort lasers with commercially available optical fibers.

关键词： fiber lasers spatiotemporally mode-locked lasers multimode nonlinear fiber optics

Recent progress on optical rogue waves in fiber lasers:status,challenges,and perspectives

在线全文

学校读者我要写书评

暂无评论

Advanced Photonics 2020年第2期2卷 3-17页

作者： Yufeng Song Zhenhong Wang Cong Wang Krassimir Panajotov Han Zhang Shenzhen University Institute of Microscale OptoelectronicsCollaborative Innovation Center for Optoelectronic Science and TechnologyShenzhen Engineering Laboratory of Phosphorene and OptoelectronicsShenzhenChina Vrije Universiteit Brussel Department of Applied Physics and PhotonicsBrussels PhotonicsBrusselsBelgium Bulgarian Academy of Sciences Institute of Solid State PhysicsSofiaBulgaria

Rogue waves(RWs)are rare,extreme amplitude,localized wave packets,which have received much interest recently in different areas of *** lasers with their abundant nonlinear dynamics provide an ideal platform to observe optical RW *** review recent research progress on rogue waves in fiber *** concepts of RWs and the mechanisms of RW generation in fiber lasers are discussed,along with representative experimental and theoretical *** measurement methods for RW identification in fiber lasers are presented and ***,prospects for future RW research in fiber lasers are summarized.

关键词： fiber lasers nonlinear fiber optics rogue wave

Analytical　Expression　of　the　Threshold　Pump　Power　of　Erbium－doped　fiber　lasers　Pumped　at　980nm　and　1480nm　Wavelengths

在线全文

学校读者我要写书评

暂无评论

Semiconductor Photonics and Technology 1996年第2期2卷 99-102页

作者： XIA Guangqiong WU Zhengmao ZHENG Ruilun(Southwest Normal University,Chongqing 630715,CHN)CHEN Jianguo(Sichuan University,Chengdu 610064,CHN )

The rate equations,which is suitable to erbium-doped fiber lasers pumped at 980 nm and 1 480nm wavelengths respectively,are investigated,and analytical expressions of the threshold pump powers under two pump wavelengt... 详细信息

关键词： fiber lasers Soliton Transmission Threshold Pump Power

Generation of the numerator=2 rational harmonic mode-locked pulses in fiber ring lasers

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2004年第9期2卷 534-535页

作者：汪平河詹黎叶庆好夏宇兴 InstituteofOpticsandPhotonics NationalLaboratoryonFiberOpticCommunicationNetworks&AdvancedOpticalCommunicationSystemsShanghaiJiaoTongUniversityShanghai200240

In conventional rational harmonic mode-locking, optical pulse trains with the repetition rate of (pn+1)f_c are generated when the modulation frequency of the in-cavity modulator is set at f_m = (n+1/p)f_c, where n and p are both integers, f_c is the fundamental cavity frequency. In this paper, we report that rational harmonic mode locking phenomenon takes place in the fiber lasers when the modulation frequency is set at f_m =(n+2/p)f_c. The pulse generations are experimentally demonstrated when the numerator of the rational corresponds to 2 in 5th and 7th order rational harmonic mode-locking.

关键词： fiber lasers Light modulation Ring lasers Ultrashort pulses

Secret key exchange in ultralong lasers by radiofrequency spectrum coding

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2015年第1期4卷 400-404页

作者： Alessandro Tonello Alain Barthelemy Katarzyna Krupa Vincent Kermene Agnes Desfarges-Berthelemot Badr Mohamed Shalaby Sonia Boscolo Sergei K Turitsyn Juan Diego Ania-Castanon Universite de Limoges XLIMUMR CNRS 7252123 Avenue A.Thomas87060 LimogesFrance Physics Department Faculty of ScienceTanta UniversityTantaEgypt Aston Institute of Photonic Technologies Aston UniversityBirmingham B47ETUK Instituto de Optica CSICC/Serrano 121Madrid 28006Spain

We propose a new approach to the generation of an alphabet for secret key exchange relying on small variations in the cavity length of an ultralong fiber *** new concept is supported by experimental results showing how the radiofrequency spectrum of the laser can be exploited as a carrier to exchange *** test bench for our proof of principle is a 50-km-long fiber laser linking two users,Alice and Bob,where each user can randomly add an extra 1-km-long segment of *** choice of laser length is driven by two independent random binary values,which makes such length become itself a random *** security of key exchange is ensured whenever the two independent random choices lead to the same laser length and,hence,to the same free spectral range.

关键词： fiber lasers fiber optics communications optical security and encryption