双程后向结构掺铒光纤超荧光光源研究

通过编制1套图形界面的模拟分析软件,对双程后向结构掺铒光纤超荧光光源有关输出功率、带宽和平均波长特性进行了理论模拟。结果表明,通过选取适当的掺铒光纤长度,总能实现光源的平均波长不依赖于泵浦功率的高稳定性。并报道了研制的双程后向结构掺铒光纤超荧光光源。     

宽带掺铒光纤超荧光光源

详细探讨了单程前向、单程后向、双程前向、双程后向等几种典型的掺饵光纤超荧光光源结构，介绍了超荧光光源的研究进展，报道了我们研制的双程后向结构超荧光光源。     

用于高精度光纤陀螺的宽带掺铒光纤光源

综述了掺铒超荧光光纤光源的国内外研究发展现状,详细探讨了单程前向、单程后向、双程前向、双程后向等几种典型的光源结构;分析了掺铒超辐射型光纤光源的输出特性与泵浦光波长、泵浦功率、光纤长度以及光学反馈的关系;并介绍了当前为改善光源带宽、平均波长稳定性以及输出功率这三个主要参数以满足高精度光纤陀螺的需求所做的一系列探索及研究现状,指出了其技术难点,对掺铒超荧光光纤光源的研究具有一定的参考价值。     

用于高精度光纤陀螺的宽带掺铒光纤光源

综述了掺饵超荧光光纤光源的国内外研究发展现状，详细探讨了单程前向、单程后向、双程前向、双程后向等几种典型的光源结构；分析了掺饵超辐射型光纤光湖源的输出特性与泵浦光波长、泵浦功率、光纤长度以及光学反馈的关系；并介绍了当前为改善光源带宽、平均波长稳定性以及输出功率这三个主要参数以满足高精度光纤陀螺的需求所做的一系列探索及研究现状，指出了其技术难点，对掺饵超荧光光纤光源的研究具有一定的参考价值。     

高功率Er/Yb共掺光纤超荧光光源

为了获得高功率超荧光输出,采用6个976nm的LD,通过一个光纤束耦合器同时抽运Er/Yb共掺光纤,分别研究了单程后向结构和双程后向结构超荧光光源的输出特性.采用单程后向装置,当抽运功率为957mW时,输出功率为120.4mW,斜率效率达到17.5%.在双程后向结构的实验装置中加入4m掺Er光纤,有效地将超荧光的3dB带宽拓展到88nm.     

高功率宽带掺铒光纤超荧光光源研究

研究了高掺杂铒光纤构成的双程后向结构超荧光光源输出特性,高掺杂铒光纤在制作超荧光光源方面具有输出功率高和带宽宽的优点.通过模拟得到在一定泵浦功率下获得最大输出带宽的最佳掺铒光纤长度.利用980 nm半导体激光器泵浦优化得到的10 m长的Lucent-LRL光纤,并用自制光纤圈反射镜构成双程后向结构,获得了26 mW的高功率宽带超荧光输出.     

双程前向掺铒光子晶体光纤超荧光光源

为了获得高稳定光纤陀螺掺铒光纤光源和改进传统掺铒光纤超荧光光源的输出稳定性,提出和使用掺铒光子晶体光纤作为超荧光光源的增益媒介。构建了双程前向结构掺铒光子晶体光纤超荧光光源, 研究了这种新型光源的输出特性。分析了掺铒光子晶体光纤长度和泵浦功率对光源输出功率、光谱谱宽和平均波长的影响。结果表明,通过选取光纤长度为10 m 和泵浦功率为220 mW,获得了双程前向结构掺铒光子晶体光纤超荧光光源。输出功率为35.4 mW,光光转换效率约16.09%,谱宽为30.9 nm,平均波长为1 548.3 nm。该结果为进一步研究掺铒光子晶体光纤超荧光光源的环境温度稳定性和适应性奠定基础。     

掺铒光纤ASE宽带光源的实验研究

掺铒光纤ASE源是一种优良的宽带光源,受到人们广泛关注.实验研究了掺铒光纤ASE宽带光源单、双程结构后向ASE输出光谱特性,当泵浦光中心波长为1480 nm时,分别考察了掺铒光纤长度、泵浦光功率对后向ASE输出平坦区间宽度和平坦度的影响.通过对两种结构下后向ASE输出光谱的分析比较发现,双程结构在L波段长波长处,尤其是1570～1620 nm波长范围,功率显著提升,从而使得ASE光谱的平坦区间宽度增大,平坦度提高.所得实验结果将为掺铒光纤ASE宽带光源的研制提供依据.     

采用光纤滤波器的高波长稳定性掺铒光纤光源

研究了双程后向结构掺铒光纤光源的平均波长对泵浦功率的赖性。实验结果表明,通过采用掺铒光纤滤波器以及选择合适的泵浦功率,平均波长随泵浦功率的变化能够降低到-9 ppm/mW。在-40~+60℃ 温度范围内,光纤光源的平均波长不稳定性小于33 ppm(峰峰值)。采用5 m 长的掺铒光纤、泵浦功率55mW 与泵浦波长974.2nm 时,光纤光源输出光波的谱宽达到17nm,功率达5.83mW。     

前向抽运双级双程掺铒光纤宽带光源

提出并实现了一种前向抽运双级双程结构的 1 5 5 μm超荧光光纤光源(SFS)。通过恰当地选择光源的各个参数,包括两段掺铒光纤(EDF)的长度和两级抽运光的功率,在保证平均波长稳定的情况下,获得了同时具有大功率和宽带特性的超荧光输出。这种结构的光源可以很好地满足高精度光纤陀螺(FOG)对光源的要求     

Effect of adding a long period grating in a double-pass backwardEr-doped superfluorescent fiber source

We first demonstrate that by inserting an appropriate long period grating in an Er-doped superfluorescent fiber source (SFS) of double-pass backward (DPB) configuration, the output spectrum can be broadened up to 40 nm. The characteristics of a long period grating (LPG) are then shown to have marked effects on the properties of the SFS. Both measured and simulated results agree well in the trend. The spectrum broadening using an LPG is shown effective over a large pump power range, especially for a single-humped DPB SFS. After the analysis of three types of output spectra, the tolerances of LPG's characteristics are found larger for a single-humped DPB SFS having the dominant band in 1558 nm     

Role of an Isolator in Optimization of Forward Conversion Efficiency in an Er-Doped SFS Source at 1.55 μm

By incorporating an isolator at an appropriate location, it is shown that it is possible to realize an efficient single-pass superfluorescent-doped fiber source with a major fraction of its emitted power in the forward direction. A theoretical model to estimate the performance of such a superfluorescent source (SFS) has been suggested and verified with experiments performed on an erbium-doped fiber in a novel pump bypass SFS configuration. Results on design issues such as optimum location of the isolator, pump power requirements, and spectral characteristics are also presented.     

泵浦功率对掺铒光纤光源性能影响的实验研究

超荧光掺铒光纤光源技术是高精度光纤陀螺的关键技术之一,其优劣直接影响陀螺的性能。在完成铒纤长度优化设计的基础上,实验分析了泵浦功率对掺铒光纤光源平均波长以及带宽的影响,同时在-20-60℃的温度范围内,测量了不同泵浦功率条件下掺铒光纤光源平均波长、带宽和输出功率随温度的漂移。实验结果表明,当泵浦功率在60—120mW范围内时,平均波长受泵浦功率的影响约为-6．5ppm／mW,可以根据光纤陀螺对输出功率和带宽大小的要求在此范围内选择合适的泵浦功率。最终装配样机的平均波长的长期稳定性（6h）达到5ppm（峰-峰值）,短期稳定性（1h）达到2ppm,可以在此基础上定制合适的光纤光栅滤波器,对ASE光谱进行滤波,使谱形满足高精度光纤陀螺的要求．     

Gamma radiation effects on erbium-doped fiber in superfluorescent fiber source

The radiation effects of two erbium-doped superfluorescent fiber sources (SFSs) are studied in gamma ray environment. Two types of output spectrum profile (twin-peaked spectrum and single-peaked spectrum) of SFSs are constructed by different configuration and parameters. The dependence of radiation-induced power loss and spectra evolution on the dosage is revealed. The results show that the amplitudes of radiation-induced power decrease are quite similar in two SFSs. But the mean wavelength variation of the single-peaked spectrum SFS is approximately 25 times smaller than that of the twin-peaked spectrum SFS. Compared to the twin-peaked spectrum SFS, the single-peaked spectrum SFS presents better radiation tolerance, which should have potential advantages in space applications.     

Characteristics of erbium-doped superfluorescent fiber sources forinterferometric sensor applications

The characteristics of 1.55 μm Er-doped superfluorescent fiber sources (SFS's), intended for fiber-optic gyroscope (FOG) applications, are explored theoretically and experimentally. With proper selection of the source configuration, fiber length, pump wavelength, pump power, and fiber composition, we show that it is possible to meet the stringent requirements of the FOG, including a high output power, broad emission bandwidth, and excellent spectral thermal stability. Variations of the mean wavelength, spectral width, and output power of the SFS with fiber length, pump power, pump wavelength, and temperature are modeled for representative sources pumped near 980 nm or 1.48 μm, and are shown to be in good agreement with experimental results. The effects of a multimoded pump, erbium ion pair, and optical feedback are also assessed. This study indicates that the Er-doped SFS is an excellent candidate for the FOG and for other applications requiring spatial coherence and low temporal coherence     

宽带超荧光光纤光源的设计与实验

设计了L带以及宽带超荧光光源,并进行了实验.得到的L带超荧光输出的3 dB带宽从1565～1610 nm;宽带超荧光输出的3 dB平坦度内的带宽从1550～1607 nm,其总的转换效率为12.3%.     

新颖的高平坦度高功率掺铒光纤光源

报道了在前向结构中光纤前端输出处加用3dB耦合器制作的光纤圈反射器形成双程后向输出结构,实现了一种高平坦化的高功率光源。通过调节抽运功率及光纤长度等参量,实现3dB带宽达35．28nm(基本完全覆盖C波段),功率为7．679mW(8．85dBm)和平均波长为1545．881nm的超荧光光纤光源(SS)。与常用技术相比,该技术更简单,实用,同时提高了光源效率,稳定性好,易于降低成本,设计方便。由于L波段的超荧光的本身平坦度较好,此方案可得到高平坦度的C L波段高功率宽带超荧光输山,尤其适用于需要高平坦度高功率超荧光的场合。     

基于双程反向结构的掺铒超荧光光纤光源

给出双程反向结构掺铒超荧光光源的理论分析模型。研制了一种采用双程反向结构，980nm激光二极管泵浦的掺铒超荧光光纤光源。在波长1550nm处，获得了光谱稳定、输出功率大的超荧光。光谱3dB带宽为55nm，并有20nm的ASE光谱平坦区。