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Over 255 mW single-frequency fiber laser with high slope efficiency and power stability based on an ultrashort Yb-doped crystal-derived silica fiber

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Photonics Research 2021年第5期9卷 649-656页

作者： YING WAN jianxiang wen CHEN JIANG FENGZAI TANG JING wen SUJUAN HUANG FUFEI PANG TINGYUN WANG Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced CommunicationSchool of Communication and Information EngineeringShanghai UniversityShanghai 200444China WMG University of WarwickCoventry CV47ALUK Optoelectronics Research Centre University of SouthamptonSouthampton SO171BJUK

A single-frequency distributed Bragg reflector (DBR) fiber laser at 1030 nm has been demonstrated using a 0.7 cm long homemade Yb:YAG crystal-derived silica fiber (YCDSF).The absorption and emission cross sections of the YCDSF are 4.93×10^(-20)cm^(2) at 980 nm and 1.1×10^(-20)cm^(2)at 1030 *** this gain fiber,an over 255 m W continuous-wave lasing in the constructed laser has been obtained at single transverse and longitudinal mode *** slope efficiency and the pump threshold of the fiber laser were up to ~35%and as low as 25 m W,*** fiber laser also demonstrated an optical signal-to-noise ratio of 79 dB and a beam quality factor of 1.016 in two orthogonal *** power fluctuation at 210.5 m W was less than 0.85%of the average power within 13 ***,the relative intensity noise and linewidth of the laser are also investigated at the different pump *** results indicate that the single-frequency DBR fiber laser has potential applications in high-quality seed sources and high-precision optical sensing.

关键词： fiber pump power

High-order mode lasing in all-FMF laser cavities

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Photonics Research 2019年第1期7卷 42-49页

作者： TENG WANG AO YANG FAN SHI YIPING HUANG jianxiang wen XIANGLONG ZENG Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication Shanghai Institute for Advanced Communication and Data Science Shanghai University

We experimentally demonstrate two kinds of all few-mode fiber(FMF) ring lasers with high-order mode(HOM)oscillation in the laser cavity. One kind is a switchable-wavelength all-FMF HOM laser with an output of tunable optical vortex beams(OVBs); the other is a Q-switched all-FMF HOM laser with an output of pulsed cylindrical vector beams(CVBs). The lasers are composed of all-FMF components and few-mode erbium-doped fiber. A Sagnac interferometer made of a 3 dB FMF coupler functions as the wavelength selector, and switchable multiwavelength tunable OVBs are experimentally realized. Carbon nanotube-based saturable absorbers and the nonlinear polarization rotation technique are used to achieve Q-switched CVB lasers. This is the first report, to our knowledge, on the generation of switchable-wavelength and Q-switched HOM beams in all-FMF laser cavities.

关键词： experimentally demonstrate laser with an output switchable-wavelength

Development of Bi/Er co-doped optical fibers for ultra-broadband photonic applications

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Frontiers of Optoelectronics 2018年第1期11卷 37-52页

作者： Yanhua LUO Binbin YAN Jianzhong ZHANG jianxiang wen Jun HE Gang-Ding PENG Photonics & Optical Communications School of Electrical Engineering University of New South Wales Sydney 2052 NSW Australia Key Laboratory of Specialty Fiber Optics and Optical Access Networks Shanghai University Shanghai 200072 China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing 100876 China Key Lab of In-fiber Integrated Optics Ministry of Education Harbin Engineering University Harbin 150001 China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic Engineering Shenzhen University Shenzhen 518060 China

Targeting the huge unused bandwidth（BW）of modem telecommunication networks,Bi/Er co-doped silica optical fibers（BEDFs）have been proposed and developed for ultra-broadband,high-gain optical amplifiers covering the 1150-1700 nm wavelength *** luminescence has been demonstrated in both BEDFs and bismuth/erbium/ytterbium co-doped optical fibers（BEYDFs）fabricated with the modified chemical vapor deposition（MCVD）and in situ doping *** novel and sophisticated techniques have been developed for the fabrication and characterization of the new active *** controlling the performance of the active fibers,post-treatment processes using high temperature,γ-radiation,and laser light have been *** many fundamental scientific and technological issues and challenges still remain,several photonic applications,such as fiber sensing,fiber gratings,fiber amplification,fiber lasers,etc.,have already been demonstrated.

关键词： Bi/Er co-doped optical fiber (BEDF) broadband emission bismuth-related active center (BAC),modified chemical vapor deposition (MCVD) fiber amplifier fiber sensing

Generating broadband cylindrical vector modes based on polarization-dependent acoustically induced fiber gratings using the dispersion turning point

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Photonics Research 2024年第9期12卷 1907-1917页

作者： MEITING XIE JIANGTAO XU JIAJUN WANG HUIHUI ZHAO YESHUAI LIU jianxiang wen FUFEI PANG JIANFENG SUN XIANGLONG ZENG Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced CommunicationInstitute for Advanced Communication and Data ScienceShanghai UniversityShanghai 200444China Shanghai Satellite Network Research Institute Co. Ltd.Shanghai 201204China

Cylindrical vector beams(CVBs)with special polarization distribution have been extensively investigated due to the unique ways of interacting with *** several configurations have been developed to generate CVBs,such as Q-plates and subwavelength gratings,the bandwidth of a single CVB is inherently narrow due to the phase geometry,which would limit its application for femtosecond ***,a broadband CVB mode converter based on an acoustically induced fiber grating(AIFG)and a tuning method of dispersion turning point(DTP)is demonstrated both theoretically and experimentally with the 3-dB bandwidth of 125 nm,which is more than 10 times that of conventional *** only can the DTP wavelength be tuned from the original 1500 nm to 1650 nm by thinning the fiber,but also the stable generation of a single broadband HE_(21)^(odd/even) mode can be controllably implemented by adjusting the polarization state of the incident light,owing to the larger beat length difference between HE21 and other CV ***,the femtosecond CVBs and orbital angular momentum(OAM)modes are successfully generated and amplified by combining the broadband AIFG with a figure-9 mode-locked fiber ***,it is verified by simulation that the choice of broadband CV mode and the tunability of DTP wavelength can be realized by designing ring-core fibers with different structures,which can furthermore improve the flexibility of generating high purity *** study provides a highly controllable technique for the generation of broadband CVBs and OAMs paving the way for high-capacity CVBs communication.

关键词： polarization fiber tuning

Highly efficient excitation of LP01 mode in ring-core fibers by tapering for optimizing OAM generation

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Chinese Optics Letters 2020年第6期18卷 5-9页

作者： Chunxiang Zhang Fufei Pang Huanhuan Liu Lifei Chen Junfeng Yang jianxiang wen Tingyun Wang Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced CommunicationShanghai Institute for Advanced Communication and Data ScienceShanghai UniversityShanghai 200444China

We have demonstrated the highly efficient excitation of the linearly polarized mode(LP01)in ring-core fibers(RCFs)by tapering the spliced point between the RCF and the standard single-mode fiber(SMF)to optimize all-fiber orbital angular momentum(OAM)*** tapering technique has been investigated theoretically and *** tapering,only 50%of light can be coupled from SMFs to *** modal interference spectrum with an extinction ratio(ER)of～9 dB is observed,showing that higher-order modes are excited in *** tapering the spliced point,90%of light is coupled,and the ER is minimized to be～2 dB,indicating that the higher-order modes are effectively suppressed by *** tapered spliced points of RCF–SMF are further applied for all-fiber OAM *** efficiencies of OAM+1 and OAM?1 generation are found to be enhanced by approximately 11.66%and 12.41%,respectively,showing that the tapered spliced point of the RCF–SMF is a feasible way to optimize OAM generation.

关键词： ring-core fiber single-mode fiber all-fiber orbital angular momentum generation tapering technology

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All-fiber linear polarization and orbital angular momentum modes amplifier based on few-mode erbium-doped fiber and long period fiber grating

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Chinese Optics Letters 2018年第10期16卷 14-17页

作者： Jianfei Xing jianxiang wen Jie Wang Fufei Pang Zhenyi Chen Yunqi Liu Wingyun Wang Laboratory of Specialty Fiber Optics and Optical Access Networks School of Communication and Information Engineering Shanghai University Shanghai 200444 China

A few-mode erbium-doped fiber（FM-EDF） is fabricated using modified chemical vapor deposition in combination with liquid solution. The core and cladding diameters of the fiber are approximately 19.44 and 124.12 μm,respectively. The refractive index difference is 0.98%, numerical aperture（NA） is 0.17, and normalized cut-off frequency at 1550 nm is 6.81. Therefore, it is a five-mode fiber, and can be used as a higher-order mode gain medium. Furthermore, a long period fiber grating（LPFG） is fabricated, which can convert LP〈01 mode to LP11 mode, and its conversion efficiency is up to 99%. The first-order orbital angular momentum（OAM） is also generated by combining the LPFG and polarization controller（PC）. Then, an all-fiber amplification system based on the FM-EDF and LPFG, for LP11 mode and first-order OAM beams, is built up. Its on-off gain of the LP11 mode beam is 37.2 d B at 1521.2 nm. The variation, whose transverse mode field intensity of first-order OAM is increased with the increase of pumping power, is obvious. These show that both the LP11 mode and first-order OAM beams are amplified in the all-fiber amplification system. This is a novel all-fiber amplification scheme,which can be used in the optical communication fields.

关键词： EDF All-fiber linear polarization and orbital angular momentum modes amplifier based on few-mode erbium-doped fiber and long period fiber grating OAM

Temperature insensitivity of an all-fiber quarter-wave plate device fabricated with a high-birefringence fiber

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Chinese Optics Letters 2024年第10期22卷 13-18页

作者： Beibei Xing jianxiang wen Sha Li Yu wen Qiuhui Chu Rumao Tao Tao Chen Yanhua Luo Wei Chen Fufei Pang Tingyun Wang Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced CommunicationSchool of Communication and Information EngineeringShanghai UniversityShanghai 200444China Laser Fusion Research Center China Academy of Engineering PhysicsMianyang 621900China

A high-birefringence fiber,Tb:YAG crystal-derived silica fiber(TYDSF),was fabricated by CO_(2)laser-heating drawing *** linear birefringence was 2.99×10^(-5),and it was used to fabricate an all-fiber quarter-wave plate(QWP)*** polarization extinction ratio(PER)of the device was 0.29 dB,and its ellipticity was 44.26°at 25℃.In the temperature range of-5℃to 200℃,its PER was always less than 0.80 dB,and the fluctuation of PER and ellipticity was also *** with QWPs fabricated with PANDA-type polarization-maintaining fiber(PMF)and elliptical-core PMF,the performance of TYDSF QWP was least sensitive to ***,the TYDSF QWP was used in a high-power laser system,still maintaining good circular polarization state,and the nonlinear effects were suppressed in the *** experimental results are of great significance to high-power lasers,fiber-optic current sensors,etc.,in harsh environments.

关键词： quarter-wave plate high birefringence crystal-derived fiber temperature insensitivity

High signal-to-noise ratio fiber laser at 1596 nm based on a Bi/Er/La co-doped silica fiber

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Chinese Optics Letters 2022年第5期20卷 19-23页

作者： Lei Yang jianxiang wen Yan Wu Ying Wan Longzhao Zeng Wei Chen Fufei Pang Xiaobei Zhang Tingyun Wang Laboratory of Specialty Fiber Optics and Optical Access Networks School of Communication and Information EngineeringShanghai UniversityShanghai 200444China

We fabricate a high-performance Bi/Er/La co-doped silica fiber with a fluorescence intensity of-33.8 dBm and a gain coefficient of 1.9 dB/*** the utilization of the fiber as a gain medium,a linear-cavity fiber laser has been constructed,which exhibits a signal-to-noise ratio of 74.9 dB at 1596 *** has been demonstrated that the fiber laser has a maximum output power of 107.4 mW,a slope efficiency of up to 17.0%,and a linewidth of less than 0.02 ***,an all-fiber single-stage optical amplifier is built up for laser amplification,by which the amplified laser power is up to 410.0 mW with pump efficiency of 33.8%.The results indicate that the laser is capable of high signal-to-noise ratio and narrow linewidth,with potential applications for optical fiber sensing,biomedicine,precision measurement,and the pump source of the mid-infrared fiber lasers.

关键词： Bi/Er/La co-doped silica fiber high signal-to-noise ratio laser narrow linewidth

基于外部气相沉积工艺的新型大有效面积非零色散位移光纤的设计与制备

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中国激光 2022年第23期49卷 141-149页

作者：查健江陈强兰兴铃张俊文建湘山东富通光导科技有限公司山东济南250119 成都富通光通信技术有限公司四川成都611731 上海大学特种光纤与光接入网省部共建国家重点实验室培育基地/特种光纤与先进通信国际合作联合实验室上海200444

采用一种具有中心凹陷的三角芯+环型的折射率剖面设计,利用外部气相沉积(OVD)工艺制备了新型非零色散位移G.655.D光纤。实验结果表明:在1550 nm和1625 nm波长处,光纤的衰减值分别为0.195 dB/km和0.203 dB/km,截止波长为1200 nm;将光纤... 详细信息

采用一种具有中心凹陷的三角芯+环型的折射率剖面设计,利用外部气相沉积(OVD)工艺制备了新型非零色散位移G.655.D光纤。实验结果表明:在1550 nm和1625 nm波长处,光纤的衰减值分别为0.195 dB/km和0.203 dB/km,截止波长为1200 nm;将光纤绕在半径为25 mm的圆柱体上100圈,此时其在1550 nm和1625 nm波长处的宏弯损耗值分别低于0.027 dB和0.045 dB;该光纤在1530~1625 nm波段的色散为1.6~9.5 ps/(nm·km),尤其是在1550 nm波长处,其有效面积达到72μm^(2),比常规G.653光纤大1.4倍。通过这种设计和方法制备的光纤可以实现零色散波长的平移,获得良好的纵向色散均匀性、较低的弯曲损耗以及较大的有效面积,适用于1530~1625 nm波段的密集波分复用应用,在长距离光纤通信中对四波混频(FWM)、交叉相位调制(XPM)等非线性效应具有较好的抑制作用,可以减少色散管理成本,具有非常重要的应用价值。

关键词：光纤光学外部气相沉积工艺 G.655.D光纤大有效面积非零色散位移密集波分复用光纤设计与制造