光纤光栅梳状滤波器及其在新型可选波长激光器中的应用

对现有在同～段光纤上多次写入光栅制成光栅梳状滤波器的方法进行了改进,利用增加光栅长度,精确控制不同光栅的曝光时间,并结合调整光栅实际写入长度的方法,制成了不均衡度小于5％、最低峰值反射率高于95％的光纤光栅梳状滤波器;同时提出了一种新颖的可选波长光纤激光器结构。采用由上述方法制作出的反射率均衡的光纤光栅梳状滤波器和可调光滤波器结合在一起进行波长选择,实现了波长的快速准确选择,同时各个波长激光的输出特性稳定,功率均衡性好,边模抑制比大于50dB。     

Electrical Wavelength Switching of Ultrashort Pulses in a Mode-Locked Er-Doped Fiber Ring Laser with Fiber Gratings

Electrical wavelength switching of picosecond pulses was demonstrated in an actively mode-locked Er-doped fiber ring laser with fiber gratings by changing the electrical driving frequency of the modulator. Laser pulses switchable between two wavelengths spaced from 0.5 to 18 nm apart were achieved. The switching speed between the two wavelengths was of the order of several hundred kilohertz.     

基于光纤激光器的波分复用光纤光栅传感系统

用传感器光栅串作环形腔激光器的端镜 ,借助腔镜倾角可调法布里珀罗滤波器对波分复用传感元进行波长寻址 ,利用非平衡迈克耳孙扫描干涉仪对来自传感光栅的包含应变信息的波长漂移信号进行解调 ,实验证实系统的应变传感灵敏度为 1 6 6 9°/ με ,与理论值 1 6 78°/ με非常吻合。锁定来自某一光栅的信号后 ,所设计的反馈装置保证了系统具备自动追踪感测信号的能力。     

间隔可调多波长光纤激光器的实验研究

半导体光放大器(SOA)的非均匀加宽特性对产生多波长激光非常有利。本文对两段式立奥-萨尼亚克(Lyot-Sagnac)滤波器进行了详细的理论分析,实现了一种基于半导体光放大器的新型多波长光纤激光器。它利用立奥-萨尼亚克滤波器的波长选择性,在室温下得到了约18个具有30 dB信噪比的多波长激光输出。波长范围1556~1577 nm。通过调节立奥-萨尼亚克环内的偏振控制器,多波长激光的波长间隔可在两种国际电信联盟(ITU)标准波长间隔(0.4 nm和0.8 nm)间选择。这种构型的光纤激光器具有稳定性好、波长间隔可控、信噪比高等优点。     

多波长啁啾叠栅的矩阵分析

在分析多波长啁啾叠栅特征的基础上,提出了多波长啁啾叠栅的矩阵分析模型,采用矩阵分析模型对4波长和8波长啁啾叠栅的反射谱特性进行了理论分析,数值分析结果与实验结果非常一致.还首次数值模拟了波长间隔0.8 nm的16波长啁啾叠栅.此方法对多波长啁啾叠栅的设计和制作具有参考价值.     

Improving the Performance of All-Optical Wavelength Converters Using Fiber Gratings

We show that spectral filtering using a fiber Bragg grating as an optical discriminator improves the performance of semiconductor optical amplifier (SOA) wavelength converters. This technique increases the operation speed and reduces the data patterning effect of SOAs for non-return-to-zero (NRZ)operation. For return-to-zero (RZ) operation the fiber grating increases extinction ratio and preserves the data polarity. We use this technique to obtain error-free wavelength conversion of NRZ data at 10 Gb s in an SOA with 6 GHz dynamic bandwidth. We also use the SOA fiber grating to convert RZ data at 10 Gb s and show that the converted pulses can propagate error free over 20,000 km in a dispersion-managed system.     

8字形腔波长可调谐锁模脉冲光纤激光器

采用非线性光纤环形镜加脉冲锁模技术及可调谐光纤光栅滤波器,对8字形腔被动锁模掺铒光纤激光器进行了波长可调谐输出的实验研究.在EDFA抽运光功率一定的情况下,通过调节偏振控制器和可调谐光纤光栅滤波器,获得了光谱稳定、重复频率1.1 MHz、输出功率起伏小于0.8 dBm、中心波长在1 548~1 570 nm内连续可调的短脉冲输出.该激光器可实现自启动锁模,且长时间稳定工作无需任何调整.     

A Practical Detection System of Multiplexed Wavelength Fiber Bragg Gratings

A practical demodulation of multiplexed wavelength FBGs is proposed. The detection wavelength of adjacent FBGs and the wavelength resolution are discussed. Experimental results show the wavelength resolution is 0.01nm and strain resolution is 8.27 ×10-6 .     

一种测定光纤光栅布拉格反射波长位移的简单方法

报道一种简单的光纤光栅对参考法测定光纤光栅布拉格波长的位移的方法，其原理是利用一个布拉格波长可调谐的光纤光栅去跟踪另一个光纤光栅拉格波长的变化，测得的光栅布拉格波长的温度灵敏度为０．００８８ｎｍ／℃，这和用可调谐半导体激光器测得的结果十分接近。     

基于光纤光栅谐振腔的掺镱全光纤激光器设计(英文)

采用数值分析方法分析了光纤长度、后腔镜反射率等因素对激光器输出阈值泵浦功率、输出功率的影响,为全光纤激光器的优化设计提供了理论基础.在设计过程中采用光纤光栅作为光纤激光器的反馈与选频腔镜,通过锥度光纤实现了泵浦模块与掺镱双包层光纤之间的低损耗连接以及高效率的泵浦激光功率传输,成功研制了具备稳定窄化线宽激光输出的掺镱全光纤激光器.实验得到了波长峰值在1 082 .50 nm,谱线宽度0 .113 nm,最大输出功率8 .5 W,泵浦阈值功率0 .8 W,斜率效率为70 .8 %的稳定激光输出.     

Fiber Modal Index Measurements Based on Fiber Gratings

A novel method based on fiber gratings for measuring the effective indices of fiber modes is proposed. The effective index difference between the core mode and a cladding mode was obtained by analyzing the interference fringe of a pair of cascaded long-period fiber gratings. In order to extract the core mode index from the measured index difference, an index matching oil immersion method is proposed. By analyzing the interaction between the cladding mode and the oil applied on the cladding surface, the mode order and the effective index of the involved cladding mode might be calculated. Experimental results about the interference fringe shifts induced by the oil index and the oil-applied length are also presented.     

An Adjustable Pure Dispersion Slope Compensating-Module without Center Wavelength Shift Based on Strain-Chirped Fiber Bragg Gratings

We demonstrate an adjustable pure dispersion slope compensating-module based on strain-chirped fiber Bragg gratings.The center wavelength of the module is preserved while the pure dispersion slope is tuned.     

Fiber Modal Index Measurements Based on Fiber Gratings

A novel method based on fiber gratings for measuring the effective indices of fiber modes is proposed. The effective index difference between the core mode and a cladding mode was obtained by analyzing the interference fringe of a pair of cascaded long-period fiber gratings. In order to extract the core mode index from the measured index difference, an index matching oil immersion method is proposed. By analyzing the interaction between the cladding mode and the oil applied on the cladding surface, the mode order and the effective index of the involved cladding mode might be calculated. Experimental results about the interference fringe shifts induced by the oil index and the oil-applied length are also presented.     

一种新型可调谐锁模光纤激光器

利用法布里-珀罗腔的激光二极管作为调制器件，实现环形腔光纤激光器的主动锁模。并利用法布里-珀罗腔的激光二极管的多纵模特性，把激光二极管当作一梳状滤波器，通过偏振控制器来调整入射到激光二极管内光的偏振态，同时均衡腔内增益，得到波长大范围可调谐的锁模激光，其脉冲宽度约为48ps，脉冲重复速率2GHz。     

光纤光栅激光器激射波长的研究

一般认为，用光纤光栅作选频元件的光纤激光器，激射波长与光纤光栅中心反射波长一致，本文报道了不同的实验研究结果。通过细致的实验研究，发现光纤光栅激光器激射波长相对于光纤光栅中心反射波长有一定的偏移。激射波长可以出现在光栅中心反射波长的长波端，也可以出现在其短波端。对不同腔结构的掺镱、掺铒光纤光栅激光器的深入研究证明，谐振腔的各向异性对激光器的激射波长偏移起到决定性的作用，波长最大偏移量主要受限于光纤光栅的反射带宽。通过激光腔内的偏振控制器改变谐振腔的各向异性，可以在光纤光栅的反射带宽内控制激射波长的位置。     

Wavelength Tuning of Long-Period Fiber Gratings by Fabrication Using a Tilted Amplitude Mask

We propose a method of tuning resonant wavelengths in the fabrication process of a long-period fiber grating using an amplitude mask tilted relative to the fiber. We irradiated a hydrogenated single-mode fiber with a KrF excimer laser through a tilted amplitude mask with a grating period of 460 Μm. Growth of resonant loss peaks in transmission spectra was measured for various tilt angles. A tuning range up to 329 nm was obtained by tilting up to 45°. The measured results agreed with numerical simulation. It was shown that using only an amplitude mask it is possible to fabricate a long-period fiber grating having resonance at any wavelength throughout the range of 1.2-1.6 Μm. A method to determine the tilt angle for a designed wavelength is discussed.     

飞秒脉冲制作啁啾光纤光栅的理论研究

提出了利用一束啁啾飞秒脉冲与另一束非啁啾飞秒脉冲相干制作啁啾光纤光栅的新方法, 并分析了其反射特性, 以及光栅结构与啁啾系数的关系, 讨论了其作为展宽器的应用, 为设计小型展宽器提供了理论基础.     

A Novel OADM Based on Fiber Gratings

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ｏｐｔｉｃａｌａｄｄ/ｄｒｏｐｍｕｌｔｉｐｌｅｘｅｒ (ＯＡＤＭ)ｉｓｔｈｅｋｅｙｃｏｍｐｏｎｅｎｔｏｆｏｐｔｉｃａｌｔｒａｎｓｐｏｒｔｎｅｔｗｏｒｋｓ(ＯＴＮ) .ＭａｎｙＯＡＤＭａｒｃｈｉｔｅｃｔｕｒｅｓｈａｖｅｂｅｅｎｒｅｐｏｒｔｅｄ ,ｓｕｃｈａｓｔｈｏｓｅｂａｓｅｄｏｎｗａｖｅｌｅｎｇｔｈｍｕｌｔｉｐｌｅｘｅｒｓ,ａｒｒａｙｅｄｗａｖｅｇｕｉｄｇｒａｔｉｎｇｓ(ＡＷＧ ) ,ａｃｏｕｓｔｏ ｏｐｔｉｃｔｕｎａｂｌｅｆｉｌｔｅｒｓ (ＡＯＴＦ) ,ｆｉｂｅｒＢｒａｇｇ ｇｒａｔｉ…     

用布拉格光纤光栅制作啁啾光纤光栅

介绍了一种用布拉格光纤光栅制作啁啾光纤光栅的方法。采用氢氟酸腐蚀布拉格光纤光栅, 使光栅的横截面沿光栅轴向逐渐变小, 然后对光栅施加１．５０ Ｎ的拉力, 在光栅轴向建立应变梯度, 制作出长１５ ｍ ｍ 、峰值反射率达９２％ 、反射半高宽为５ ｎｍ 的啁啾光纤光栅。     

Dynamic Wavelength Tuning of a Fiber Ring Semiconductor Laser

ＤｙｎａｍｉｃＷａｖｅｌｅｎｇｔｈＴｕｎｉｎｇｏｆａＦｉｂｅｒＲｉｎｇＳｅｍｉｃｏｎｄｕｃｔｏｒＬａｓｅｒＬＵＯＢｉｎＬ¨ＵＨｏｎｇｃｈａｎｇＰＡＮＷｅｉＣＨＥＮＪｉａｎｇｕｏ（ＳｏｕｔｈｗｅｓｔＪｉａｏｔｏｎｇＵｎｉｖｅｒｓｉｔｙ，Ｃｈｅｎｇｄｕ６...