近年来,随着网络规模的不断扩大,结构和功能日趋复杂,网络流量快速增长,各种新型网络应用不断出现,对传统网络的配置、运行和管理提出了严峻挑战.软件定义网络(software defined networking,SDN)作为新兴的网络架构,较好地适应了各种网...近年来,随着网络规模的不断扩大,结构和功能日趋复杂,网络流量快速增长,各种新型网络应用不断出现,对传统网络的配置、运行和管理提出了严峻挑战.软件定义网络(software defined networking,SDN)作为新兴的网络架构,较好地适应了各种网络应用的需求.在SDN网络中进行测量任务能及时了解、监控和掌握网络状态,是优化网络结构、改善网络服务质量、实现网络故障诊断和恢复的重要手段.本文对SDN网络测量技术进行综述,研究网络性能测量中的延迟测量、丢包测量和带宽测量等方面以及网络流量测量等相关技术,从设计理念、测量方式、测量对象、技术特点,以及优缺点等方面做了详尽的描述.文章最后进行了总结并对未来工作进行了展望.展开更多
We demonstrate an all-polarization-maintaining[PM]passively mode-locked Yb^(3+)-doped fiber laser[YDFL]with a fundamental repetition rate of 1.3 GHz.The optical spectra of a linearly polarized soliton exhibit differen...We demonstrate an all-polarization-maintaining[PM]passively mode-locked Yb^(3+)-doped fiber laser[YDFL]with a fundamental repetition rate of 1.3 GHz.The optical spectra of a linearly polarized soliton exhibit different shapes by rotating the fast axis of the fiber optical pigtail of a dispersive dielectric mirror.The oscillator provides a series of laser performance,such as a threshold pump power for continuous wave laser oscillation of 3.1 mW,an optical-to-optical efficiency for modelocking of 29%,and an integrated relative intensity noise of 0.08%.To the best of our knowledge,this is the first report of>1 GHz ultrafast all-fiber YDFL with PM architecture.展开更多
We present a study on a watt-level acousto-optically Q-switched Pr:YLF laser at three different repetition rates(10 kHz,20 kHz,and 50 kHz)for the first time,to the best of our knowledge.The corresponding average outpu...We present a study on a watt-level acousto-optically Q-switched Pr:YLF laser at three different repetition rates(10 kHz,20 kHz,and 50 kHz)for the first time,to the best of our knowledge.The corresponding average output powers and pulse widths were measured to be 1.14 W,1.2 W,and 1.32 W,and 40 ns,52 ns,and 80 ns,respectively.A maximum pulse energy of0.11 mJ was obtained,corresponding to a peak power of up to 2.8 kW at a repetition rate of 10 kHz.The simulated dynamics of a fast Q-switched Pr:YLF laser is in agreement with the experiment.The laser's ability to generate stable pulses with high peak power and short pulse width makes it highly desirable for various practical applications,such as laser machining and material processing.展开更多
We report continuous-wave deep red lasers at 696.6 and 698.6 nm in a Pr^(3+):YLF crystal pumped by an InGaN laser diode.A Lyot filter was inserted into the cavity as a birefringent filter to select wavelength;the lase...We report continuous-wave deep red lasers at 696.6 and 698.6 nm in a Pr^(3+):YLF crystal pumped by an InGaN laser diode.A Lyot filter was inserted into the cavity as a birefringent filter to select wavelength;the lasers at 696.6 and 698.6 nm were obtained with a maximum output power of 1.36 and 3.11 W,separately.To the best of our knowledge,the output powers of these two lasers are the highest to date,and this is the first scaling of the output power of the Pr^(3+):YLF laser to the watt level at around 696 nm.In addition,the corresponding theoretical analysis and simulation were carried out to explain the experimental phenomena.展开更多
文摘近年来,随着网络规模的不断扩大,结构和功能日趋复杂,网络流量快速增长,各种新型网络应用不断出现,对传统网络的配置、运行和管理提出了严峻挑战.软件定义网络(software defined networking,SDN)作为新兴的网络架构,较好地适应了各种网络应用的需求.在SDN网络中进行测量任务能及时了解、监控和掌握网络状态,是优化网络结构、改善网络服务质量、实现网络故障诊断和恢复的重要手段.本文对SDN网络测量技术进行综述,研究网络性能测量中的延迟测量、丢包测量和带宽测量等方面以及网络流量测量等相关技术,从设计理念、测量方式、测量对象、技术特点,以及优缺点等方面做了详尽的描述.文章最后进行了总结并对未来工作进行了展望.
基金supported by the National Natural Science Foundation of China(No.61905205)。
文摘We demonstrate an all-polarization-maintaining[PM]passively mode-locked Yb^(3+)-doped fiber laser[YDFL]with a fundamental repetition rate of 1.3 GHz.The optical spectra of a linearly polarized soliton exhibit different shapes by rotating the fast axis of the fiber optical pigtail of a dispersive dielectric mirror.The oscillator provides a series of laser performance,such as a threshold pump power for continuous wave laser oscillation of 3.1 mW,an optical-to-optical efficiency for modelocking of 29%,and an integrated relative intensity noise of 0.08%.To the best of our knowledge,this is the first report of>1 GHz ultrafast all-fiber YDFL with PM architecture.
基金supported by the National Natural Science Foundation of China(No.61975168)。
文摘We present a study on a watt-level acousto-optically Q-switched Pr:YLF laser at three different repetition rates(10 kHz,20 kHz,and 50 kHz)for the first time,to the best of our knowledge.The corresponding average output powers and pulse widths were measured to be 1.14 W,1.2 W,and 1.32 W,and 40 ns,52 ns,and 80 ns,respectively.A maximum pulse energy of0.11 mJ was obtained,corresponding to a peak power of up to 2.8 kW at a repetition rate of 10 kHz.The simulated dynamics of a fast Q-switched Pr:YLF laser is in agreement with the experiment.The laser's ability to generate stable pulses with high peak power and short pulse width makes it highly desirable for various practical applications,such as laser machining and material processing.
基金supported by the National Natural Science Foundation of China(No.61975168)。
文摘We report continuous-wave deep red lasers at 696.6 and 698.6 nm in a Pr^(3+):YLF crystal pumped by an InGaN laser diode.A Lyot filter was inserted into the cavity as a birefringent filter to select wavelength;the lasers at 696.6 and 698.6 nm were obtained with a maximum output power of 1.36 and 3.11 W,separately.To the best of our knowledge,the output powers of these two lasers are the highest to date,and this is the first scaling of the output power of the Pr^(3+):YLF laser to the watt level at around 696 nm.In addition,the corresponding theoretical analysis and simulation were carried out to explain the experimental phenomena.
