共查询到20条相似文献,搜索用时 57 毫秒
1.
2.
介绍了拉锥光纤耦合的SOA组件的结构特点,并针对该结构计算分析了光耦合损耗的最小值,为了进一步减小SOA组件的光耦合损耗,提出了不对称形式的拉锥光纤耦合的SOA组件结构,这在原有的制作工艺技术条件下,中以将整个组件的光耦合损耗降低1dB。 相似文献
3.
介绍了一种新的建立在相干检测原理上的光衰减标准。与采用功率比法的装置相比,本装可以达到更高的灵敏度和更好的线性,基测试动态范围大于60dB。 相似文献
4.
光纤通信技术是指把光波作为信息传输的载波,以光纤作为信息传输的媒介,将信息进行点对点发送的现代通信方式。光纤通信技术的诞生及深入发展是信息通信史上一次重要的改革。光纤通信技术从理论提出到工程领域的技术实现,再到今天高速光纤通信的实现,前后经历了几十年的时间。本文对光纤通信的发展以及单模光纤与多模光纤的特点进行了阐述。 相似文献
6.
7.
8.
9.
10.
本文着重介绍作者研制的单模光纤群折射率参数的测量系统的原理、测试结果及误差分析。其测量总不确定度(1σ)优于6×10-5。该测量系统将用于OTDR的校正及光纤传输特性的研究。 相似文献
11.
12.
Ya-Ni Zhang 《Journal of Modern Optics》2013,60(21):3563-3571
A new structure for single-polarization single-mode photonic-crystal fiber is proposed and numerically analyzed by using a full vector finite element method with anisotropic perfectly matched layers. The cutoff wavelength of two linearly polarized states can be controlled artificially by varying the structure parameters of photonic crystal fiber. The confinement loss are also numerically calculated and optimized at 650 nm communication wavelength of polymer optical fiber. From the numerical results it is confirmed that the proposed fiber is low-loss single-polarization single-mode photonic-crystal fiber within the wavelength range from 0.63 to 0.73 µm, where only the slow-axis mode exists and the confinement loss is less than 0.05 dB m?1. 相似文献
13.
Angela Amphawan Vivekanand Mishra Kashif Nisar Benjaporn Nedniyom 《Journal of Modern Optics》2013,60(20):1745-1752
This paper presents a qualitative, real-time backlighting positioning sensor for the alignment of an optical beam to a minutely deviated diffraction order axis to increase the power coupling efficiency into a multimode fiber in selective launches. Results show that the technique facilitates the alignment of the lenses to the first diffraction order axis and improves the power coupling efficiency into a multimode fiber. 相似文献
14.
A kind of single-polarization and single-mode totally internal reflection photonic crystal fiber (SPSM TIR-PCF) is proposed in this paper. It is a PCF structure with elliptical air holes in the cladding and four large holes in the first ring. A full-vector plane wave expansion method is employed to analyze this PCF structure. The numerical results show that this PCF structure can realize an ultra-broad SPSM bandwidth of 540?nm with a confinement loss less than 0.1?dB?km?1, the broadest bandwidth to the best of our knowledge. Moreover, the structure that we proposed can realize a high nonlinear coefficient. 相似文献
15.
Waleed S. Mohammed Xija Gu Joachim Meier Peter W.E. Smith 《Journal of Modern Optics》2013,60(7):1033-1049
In this paper we present a simple and novel method to maximize on-axis coupling efficiency to radially symmetric fibers without the need for extra free space optical elements. The method is based on inserting a segment of step-index multimode fiber (MMF), cleaved to a particular length, between the input fiber and the output fiber (OF). The MMF segment modifies the input field to match the guided modes in the OF. Using this technique we show that, by inserting an appropriate length MMF segment, it is theoretically possible to obtain a coupling coefficient as high as ?0.8 dB between a single mode fiber and a graded index ring-shaped fiber and ?0.32 dB for a multi-shell fiber. Our experimental measurements showed good agreement with theoretical predictions for the ring fiber. 相似文献
16.
光纤出射光强分布研究 总被引:5,自引:1,他引:5
对多模光纤出射光束的光强分布用横向位移法进行了理论分析和实验研究,并用数值计算的方法分析实验测量数据.结果表明,高斯光束可以很好地描述光纤出射光强的分布,光纤出射光束光强分布参数主要与光纤芯径和出纤光功率等有关,为强度调制型光纤传感器的优化研制提供了必要的实验依据. 相似文献
17.
Prosenjit Roy Chowdhury Sanchita Pramanik Somenath Sarkar 《Journal of Modern Optics》2013,60(6):580-585
Accurate knowledge of spot size, an important criterion in single-mode fiber optics, is obtained by two different optimization techniques, the well-known variational method and Marcuse formulation. The later is more accurate but cannot predict fiber parameters from given spot sizes. In this study, it is shown for the first time to the best of our knowledge that using simultaneously Marcuse relations of fiber spot sizes for single-mode graded index fibers and also variational formulation, we can more accurately and easily determine the fiber parameters for a particular normalized frequency. Then it is shown with typical example of fractional power in the core that in the case of such fibers, this synthesis of these two useful approaches can also more accurately estimate propagation characteristics of practical interest. This equivalence provides an easy and useful connection between two fundamental but disjoint approaches and should find wide use. 相似文献
18.
Theoretical investigations of stimulated brillouin scattering-based tunable slow light in (i) Er-doped tellurite and (ii) undoped tellurite fibers are reported. Maximum allowable pump power for undistorted output pulse, Brillouin gain, time-delay, figure-of-merit, and time-delay slop efficiency of both the fibers has been obtained. We have found that (i) Brillouin gain up to ~91 dB and time delay of 140 ns can be achieved using 1100 mW pump power in 2 m Er-doped fiber and (ii) Brillouin gain up to ~86 dB and time delay of ~227 ns using 23 mW pump power in 100 m undoped tellurite fiber can be achieved. Simulated results indicate that the time delay in fibers can be tuned with the pump power to obtain tunable slow light features in these fibers. We feel that detailed theoretical investigations and simulations carried out in the study have potential impact in the design and development of slow light-based photonic devices. 相似文献
19.
平面镜半导体光束整形的设计优化与光纤耦合 总被引:1,自引:0,他引:1
本文在光纤耦合理论分析的基础上,采用平面镜反射整形方法对半导体准直光束进行重排,提出了应用于半导体光束整形的整形器结构表达式.针对慢轴发散角较大引起整形次数增加和多次反射易损耗的特点,分析并优化平面镜的结构参数,设计了整形次数为13次的平面整形器,使得半导体激光器快、慢轴方向的光束实现光参数积均衡.通过对整个光学系统的模拟和实验,表明采用该方法能够实现条阵半导体激光耦合进入芯径200μm、数值孔径为0.22的光纤中,耦合效率接近50%. 相似文献
20.
为了解决光纤多普勒测振仪远距离非接触测量物体振动时,信号偏弱、过零点波形凌乱、难于解调的问题,本文提出了一种新型光纤准直系统。本系统主要采用在小型C-lens光纤准直器后端增加整形系统并借助ZEMAX软件对高斯光束进行准直并优化,通过对光纤准直系统成品进行耦合测试实验,使用C-lens准直器与光纤准直系统进行信号耦合效率的测试对比。实验结果表明:改进后的准直系统能够满足2 m的工作距离,空间返回光耦合效率最大能达到6.3%,极大地提升了多普勒信号的对比度,提高了远距离光纤多普勒测振仪对振动的测量精度。
相似文献