共查询到20条相似文献,搜索用时 31 毫秒
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光纤偏振模色散的测量 总被引:11,自引:1,他引:10
光纤中的偏振模色散是限制高速光纤通信系统传输容量的极限因素,本文报道光纤偏振模色散的测量,对国内外多种光纤进行了测量比较,较长的单模非偏振保持光纤的多次测量值科克斯韦概率分布,同时发现国产的光纤质量有待改进,最后分析了一些实验中观察以的现象并作了解释和讨论。 相似文献
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通过对微分群时延差(DGD)统计特性和偏振模色散(PMD)矢量自相关函数的数值模拟,分析比较了目前常用的三种PMD模拟器的性能. 结果表明:在DGD分布方面,由DGD发生器构成的模拟器,一个DGD发生器就可与实际光纤PMD的统计特性相符合,而由保偏光纤和可旋转的连接器构成的模拟器则至少需要15段. 在自相关函数方面,基于保偏光纤的模拟器取决于各段光纤的延时量,而基于DGD发生器的模拟器在中心频带外的自相关值很平稳,可视为常数.
关键词:
光纤通信
偏振模色散
偏振模色散模拟器
自相关函数 相似文献
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保偏光纤和偏振器的参数以及它们之间的连接角度对传输光的光谱特性有重要的影响。利用琼斯矩阵建立了光波的传输模型,首次讨论了光波偏振度、光纤长度、光纤之间以及光纤与器件之间的对轴角度等对输出光谱的影响。研究表明,当光纤之间或光纤与器件之间的对轴角度不为零时,完全非偏振光的输出光谱形状不会发生改变,而偏振或部分偏振光波的输出光谱中叠加了周期函数。对轴角度一定时,光纤越长,周期函数的周期越小;光纤长度一定时,在一定的范围内,对轴角度越大,周期函数的幅值越大。通过实验对结论进行了验证。结论对采用保偏光纤和偏振器的系统具有理论指导意义。 相似文献
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保偏光纤的连接损耗和消光比分析 总被引:1,自引:0,他引:1
采用模式分析法处理两保偏光纤在连接中各种几何不对准误差引起的损耗和消光比的计算问题,给出了数值求解的结果,该结论对保偏光纤的连接,熔接和耦合等具有一定的指导意义。 相似文献
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Zhiwei Men Wenhui Fang Zuowei Li Guannan Qu Chenglin Sun Shuqin Gao Guohui Lu 《Journal of Raman spectroscopy : JRS》2010,41(12):1661-1663
We present a simple analytical model to describe the stimulated Raman Stokes scattering (SRS) linear polarization spectroscopy of fluorescent dye solutions in liquid‐core optical fibers (LCOFs). In this scheme, the linear polarization direction of the pump pulse is set parallel to the y‐axis through a straight polarization‐maintaining LCOF, in which the energy of the total optical field is kept invariant, and different fluorescence dyes are used to generate different first‐order Stokes intensities. We demonstrate the SRS of all‐trans‐β‐carotene and fluorescein in carbon disulfide (CS2) solutions due to the optical field‐induced reorientation effect, which makes the first‐order Stokes polarization direction rotate by an angle of 88° or 61°, respectively. This demonstrates the good agreement between the theory presented and the experiment. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
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自从2007年布里渊动态光栅被首次提出用于实现光存储以来,该技术得到了国际上的广泛关注和研究.布里渊动态光栅本质上是由相干声波场激发的折射率光栅,一般情况下两束抽运光(频率差等于光纤的布里渊频移)以相同的偏振态从光纤两端注入到光纤中,通过受激布里渊散射效应激发出相干声波场,即形成布里渊动态光栅.光纤布里渊动态光栅因具有全光产生、参数灵活可控的优点,已被广泛研究应用于光纤传感、光纤特性表征、光存储、全光信号处理、微波光子学和高精度光谱分析等.本文分析布里渊动态光栅产生和探测原理,重点探讨在高性能分布式光纤传感上的应用,这些应用包括高灵敏度温度和应变分布式传感、温度和应变同时解调、分布式横向压力传感、分布式静压力(气压或液压)传感、高空间分辨率分布式传感和高精度光谱分析. 相似文献
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光纤热极化过程的实时测试研究 总被引:1,自引:0,他引:1
通过热极化可以使中心对称的熔石英光纤中产生二阶非线性效应和线性电光效应。为了解各热极化过程参量对热极化产生的线性电光效应的影响,利用全保偏光纤马赫一曾德尔干涉仪构造了一套光纤热极化的实时线性电光效应测试系统,并利用其进行了光纤热极化全过程的监控测试。在线测试了热极化过程的一些参量,例如极化电压、极化时间、以及极化温度等对热极化光纤中产生的线性电光效应的影响。实时测试研究表明,在光纤中施加尽可能高的极化电场将可能在光纤中产生较高的线性电光效应。对侧边抛磨光纤结构的热极化器件,考虑到器件的抗强电场击穿能力,可选用3.o~4.0kV左右的极化直流电压。当施加3.0kV左右的极化电压时,热极化优化时间约为16min,最佳热极化加热温度约为190℃。 相似文献
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Rare-earth doped fibers suffer from relatively high attenuation in comparison to conventional communication fibers. In order to improve the properties of such fibers, understanding of the mechanisms involved in scattering effects is of great importance. The effect of Nd-doping, Al-codoping and of the drawing temperature on the scattering effect was investigated for several different optical fibers. To this end a measuring setup was realized which allows absolute measurements of the scattering coefficient at different positions along a fiber. Also separation of total attenuation and scattering effects is possible. The presented results indicate scattering effects as primary source for increased attenuation compared with undoped fibers. 相似文献
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Rare-earth doped fibers suffer from relatively high attenuation in comparison to conventional communication fibers. In order to improve the properties of such fibers, understanding of the mechanisms involved in scattering effects is of great importance. The effect of Nd-doping, Al-codoping and of the drawing temperature on the scattering effect was investigated for several different optical fibers. To this end a measuring setup was realized which allows absolute measurements of the scattering coefficient at different positions along a fiber. Also separation of total attenuation and scattering effects is possible. The presented results indicate scattering effects as primary source for increased attenuation compared with undoped fibers. 相似文献
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We derive a simple model describing steady characteristics of Raman fiber lasers made with polarization maintaining fibers. We show both theoretically and experimentally that this kind of laser simply consists of two independent Raman lasers linearly polarized along the fiber birefringence axes. The output power characteristics of the laser are shown not to be influenced by optical Kerr effect. Finally, we use our model to propose answers to questions recently raised about efficiency of Raman lasers made with polarization maintaining fibers. 相似文献
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Rare-earth doped fibers for high power fiber amplifiers normally have a small refractive index difference between the core and inner cladding, but have a larger core diameter than conventional telecom fibers. We take advantage of this feature as well as the difference between the optical and acoustic waveguides and proposed several fiber designs to mitigate Stimulated Brillouin scattering (SBS) to produce higher output powers. The numerical modeling shows that an increase in SBS threshold by 3-6 dB can be achieved using Ge-codopant while maintaining diffraction limited beam quality. The key parameters that can affect the SBS performance are specified and optimal parameters for SBS suppression are obtained. The study also highlights the need to take into account the effects of minor refractive index profile variation in evaluating SBS performance. 相似文献