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光纤中受激Brillouin散射动态弛豫振荡特性及其抑制方法

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物理学报 2009年第12期58卷 8316-8325页

作者：尹经禅肖晓晟杨昌喜清华大学精密仪器与机械学系精密测试技术与仪器国家重点实验室北京100084

为了避免在高功率光纤放大器和光纤相位共轭镜等实际应用中因受激Brillouin散射(SBS)造成的光纤损伤,根据描述SBS动态弛豫振荡特性的振幅耦合方程,利用有限差分的数值模拟方法研究了光纤中SBS的动态弛豫振荡特性,并对其抑制进行了初步探... 详细信息

为了避免在高功率光纤放大器和光纤相位共轭镜等实际应用中因受激Brillouin散射(SBS)造成的光纤损伤,根据描述SBS动态弛豫振荡特性的振幅耦合方程,利用有限差分的数值模拟方法研究了光纤中SBS的动态弛豫振荡特性,并对其抑制进行了初步探讨.得到了光纤中SBS弛豫振荡在不同的脉冲上升时间的时空三维图;同时利用方波和脉冲光作抽运光进行了相应实验研究,实验结果与理论模拟结果符合很好.结果表明,增大抽运光脉冲上升时间可以有效抑制因SBS而产生的弛豫振荡,进而避免因其造成的光纤损伤.

关键词：受激Brillouin散射动态弛豫振荡特性有限差分法

基于光纤四波混频波长转换和色散的慢光实验研究

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物理学报 2010年第6期59卷 3986-3991页

作者：尹经禅肖晓晟杨昌喜清华大学精密仪器与机械学系精密测试技术与仪器国家重点实验室北京100084

对基于光纤四波混频(FWM)波长转换和色散的慢光实现进行了详细和系统的实验研究.首先,实验测定了高非线性光纤中FWM带宽约为40nm,从而确定了慢光的可调谐带宽;接着,在普通单模光纤和色散补偿光纤(DCF)中针对500MHz正弦信号和100ps短脉... 详细信息

对基于光纤四波混频(FWM)波长转换和色散的慢光实现进行了详细和系统的实验研究.首先,实验测定了高非线性光纤中FWM带宽约为40nm,从而确定了慢光的可调谐带宽;接着,在普通单模光纤和色散补偿光纤(DCF)中针对500MHz正弦信号和100ps短脉冲信号分别实现了3.4和1.98ns的脉冲延迟,在DCF中还实现了2.09ns的脉冲提前.讨论了增大延迟量的方法,指出随着宽带FWM波长转换的实现和大色散光纤的应用有望获得微秒量级的大延迟量,从而为高性能光纤延迟线和全光缓存器等应用提供支持.

关键词：慢光四波混频色散

Nonreciprocal Coupling in Asymmetric Dual-Core Photonic Crystal Fibres

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Chinese Physics Letters 2004年第8期21卷 1542-1544页

作者：张林杨昌喜 StateKeyLaboratoryofPrecisionMeasurementTechnologyandInstruments DepartmentofPrecisionInstrumentsTsinghuaUniversityBeijing100084

The photonic crystal fibre with asymmetric dual cores is shown to attain strongly nonreciprocal coupling of the lightwave propagating along the fibre, for the first time to our knowledge. It is found that the coupling properties can be quite different when the incident position is changed. This kind of fibre could have potential for unidirectional coupler applications in fibre-optic local and metropolitan area networks. We also examine the polarization and wavelength dependence of the coupling nonreciprocity in the asymmetric dual-core photonic crystal fibres.

关键词： Optics quantum optics and lasers

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单腔双光梳锁模光纤激光器及其应用研究进展

中国激光 2021年第15期48卷 3-19页

作者：杨昌喜赵康俊曹博高晨心肖晓晟清华大学精密仪器系精密测试技术与仪器国家重点实验室北京100084 北京邮电大学电子工程学院信息光子学与光通信国家重点实验室北京100876

双光梳光谱技术作为一种新兴的宽带光谱测量技术,具有超高分辨率、高灵敏度和高采样率的特点,在气体吸收谱测量、温室气体排放监控、非线性光谱成像等领域具有重要应用。研究表明,仅从一台激光器中产生高相干的双光梳光源,克服了传统双... 详细信息

双光梳光谱技术作为一种新兴的宽带光谱测量技术,具有超高分辨率、高灵敏度和高采样率的特点,在气体吸收谱测量、温室气体排放监控、非线性光谱成像等领域具有重要应用。研究表明,仅从一台激光器中产生高相干的双光梳光源,克服了传统双光梳光源产生方法中存在的频率锁定系统复杂、梳齿数量较少、制作工艺困难等缺点,这种光源是理想的双光梳光源之一。结合国内外相关研究进展,综述了单腔双光梳的产生方法、单腔双光梳锁模光纤激光器中的孤子动力学研究以及单腔双光梳的应用。

关键词：激光器双光梳光谱技术单腔双光梳锁模光纤激光器

Sinusoidally Chirped Fibre Bragg Gratings

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Chinese Physics Letters 2003年第8期20卷 1293-1295页

作者：张林杨昌喜 DepartmentofPrecisionInstruments TsinghuaUniversityBeijing100084

A sinusoidal chirp structure is proposed to improve the performance of fibre gratings as dispersion compensators and multichannel filters. Nearly ideal reflection spectra from sinusoidally chirped fibre gratings are exhibited. The bandwidth utilization defined as the ratio of -1 dB to -30 dB bandwidths could be higher than 0.85, even up to 0.985. The sinusoidal chirp can be applied to the sampled fibre gratings to enhance channel uniformity. We demonstrate 141 uniform channels with a 25-GHz spacing for high dense wavelength multiplexing applications.

关键词： Bandwidth

Laser-Induced Silver Nanoparticles Deposited on Optical Fiber Core for Surface-Enhanced Raman Scattering

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Chinese Physics Letters 2010年第4期27卷 114-117页

作者：黎铭珊杨昌喜 State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instruments Tsinghua University Beijing 100084

We report on surface-enhanced Raman scattering （SERS） probes based on silver nanopaxtieles which axe deposited on the core of the distal end of standard single mode fibers, by means of the very simple, versatile, and lowcost laser-induced nanoparticle technique. The morphological features of the Ag nanoparticles vary according to the experimental conditions such as laser power, illumination time, and concentration of the reaction solution. The SERS activity of the probes is demonstrated with the detections of rhodamine 6G aqueous solutions. The detections are made from both ends of the probes, i.e., in direct detection mode from the end with nanoparticles and in remote detection mode from the distal end, respectively.

关键词： Condensed matter: electrical magnetic and optical Optics quantum optics and lasers Nanoscale science and low-D systems

Artificial spectral filtering in dissipative soliton fiber lasers with invisible bandpass filters

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Chinese Physics B 2012年第9期21卷 309-314页

作者：孔令杰肖晓晟杨昌喜 State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentsTsinghua University

We numerically study the artificial spectral-filtering effect in dissipative soliton fiber lasers without intracavity spectral filters. It is found that in dissipative soliton lasers with real saturable absorbers （SAs）, the dynamic spectral filtering of the real SAs serves as an artificial spectral filter and contributes to the pulse shaping. While in the dissi- pative soliton lasers with artificiM SAs, such as nonlinear polarization rotation, the spectrM filtering introduced by the intracavity polarization-dependent components acts as an artificial spectral filter and shapes the pulses to obtain mode- locking. An investigation of the artificial spectral-filtering effect reveals the operating mechanisms of the dissipative soliton fiber lasers without visible bandpass filters.

关键词： fiber laser mode locking

Multi-Mode Coupling in Long-Period Fibre Gratings

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Chinese Physics Letters 2004年第8期21卷 1549-1552页

作者：刘子熹杨昌喜 DepartmentofPrecisionInstruments TsinghuaUniversityBeijing100084

We report multi-mode coupling in long-period fibre gratings (LPFGs). The analytical solution to three-mode coupling equations is presented for the first time. A 3×3 transmission matrix is attained and can be used to calculate the transmission spectra of nonuniform gratings in a way much faster than direct numerical integration. It is shown that when the resonant wavelengths of cladding modes are far from each other, two-mode coupling model can still be used. Otherwise we can only choose a multi-mode coupling model. Theoretically fitting of the result from the multi-mode coupling equations agrees well with the experimental one for mechanically-induced LPFGs.

关键词： Optics quantum optics and lasers

All-normal-dispersion Yb-doped mode-locked fibre laser and its stability analysis

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Chinese Physics B 2010年第7期19卷 308-312页

作者：孔令杰肖晓晟杨昌喜 State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentsTsinghua University

We experimentally demonstrate an all-normal-dispersion Yb-doped mode-locked fibre laser with no intentional spectral filter inserted. Pulses with 1.1 nJ pulse energy at a repetition rate of 20.4 MHz are achieved. A theoretical model of the fibre laser is derived, whose coefficients are explicitly dependent on the orientations of the wave plates and the polarizer. Based on the model, stability diagrams of both the mode-locking and the continuous wave regimes of the laser are presented. The influence of group-velocity dispersion （GVD） and cavity length on the stability of mode-locking is also discussed.

关键词： fibre laser mode-locking ytterbium