光纤连接器端面几何参量自动测量仪

报道了一种高精度测量光纤连接器端面几何参量的自动测量仪。叙述了光纤连接器的端面几何参量的测量原理。由光纤连接器端面形貌和纤芯中心坐标,可以高精度得到曲率半径、顶点偏移量、端面倾斜角和光纤高度等影响连接器性能的关键端面几何参量。该仪器体积小,自动化程度高,用户界面友好,使用方便,可测量物理接触、角度式物理接触等类型的光纤连接器端面几何参量。实际测量证明,该测量仪有很好的重复测量精度。该测量仪与美国Dorc公司ZX-1 mini PMS测量仪和Norland公司NC3000测量仪相比,测量精度水平相当。该仪器样机已通过华东国家计量测试中心的测试。     

倒锥透镜型塑料光纤连接器光学特性研究

提出一种基于倒锥透镜光纤端的新型塑料光纤连接器.为了增大光纤的数值孔径，降低光纤端面对于对准准确度的要求，连接器的光纤连接端面制成倒锥透镜形状.利用截断法对该类型连接器的光学特性进行了测试.1 m长光纤跳线总损耗有75.7％集中在5.4 dB～6.0 dB之间，连接损耗70.7%集中在2.1 dB~2.7 dB之间，同一组跳线插拔200次连接损耗有95％集中分布在2.2 dB～2.58 dB.实验结果表明：倒锥透镜型塑料光纤连接器可以满足“光纤入户”对连接器性能的要求.     

抛光对光纤连接器回波损耗的影响

分别选用氧化铝和氧化硅材料的抛光砂纸,在施加不同抛光压力、抛光时间,以及抛光助剂等工艺条件下,实验研究了抛光对连接器回波损耗的影响规律。通过实验发现:氧化铝砂纸干式抛光使光纤连接器的回波损耗仅保持在32～38dB之间;氧化硅砂纸干式抛光会造成光纤端面污损,使得连接器的回波损耗降低到20dB以下;氧化铝与氧化硅砂纸湿式抛光均可使光纤连接器的回波损耗提高到45～50dB,但氧化铝砂纸湿式抛光会造成80nm以上的光纤凹陷。因此,制作高回波损耗的光纤连接器应优先选用氧化硅砂纸湿式抛光工艺,抛光时间应控制在20～30s。     

有方向性锥形光纤连接器及其耦合特征

光纤续接时,横向偏移对耦合效率的影响非常显著,为了降低光纤续接对横向偏移的敏感性,提出了新型有方向性锥形通信光纤连接器。采用了沿信号传输方向的锥形结构,从而提高其可靠性。根据波动理论,对新连接器的纵向传播常数进行泰勒级数展开,得到了锥形光纤功率分布的近似解。分析了锥体长度、锥度以及和光纤折射率等参数对耦合效率的影响。还试制了6个锥形连接器样品,进行了耦合效率实验测量,实验测量结果和理论分析是一致的,从而验证了理论分析的正确性。     

量子点单光子源的光纤耦合

半导体量子点在低温下产生谱线细锐的激子发光可制备单光子源.光纤耦合可避免低温共聚焦装置扫描定位和振动影响,是实现单光子源即插即用和组件化的关键技术.在耦合工艺上,基于微区定位标记发展出拉锥光纤与光子晶体腔或波导侧向耦合、大数值孔径锥形端面光纤与量子点样片垂直耦合等技术;然而,上述工艺需要多维度精密调节以避免柔软光纤的畸形弯曲实现对准和高效耦合.陶瓷插针或石英V槽封装的光纤无弯曲且具有大平滑端面,只要与单量子点样片对准贴合就可保证垂直收光, V槽封装的排式光纤还可通过盲对粘合避免扫描对准,耦合简单.本文在前期排式光纤粘合少对数分布Bragg反射镜(distributed Bragg reflector, DBR)微柱样片实现单光子输出基础上,经理论模拟采用多对数DBR腔提升样片垂直出光和光纤收光效率,使光纤输出单光子计数率大大提升.     

基于压电陶瓷闭环控制的线性可调谐环形腔光纤激光器

提出了一种基于压电陶瓷闭环控制的线性可调谐环形腔光纤激光器。光纤激光器环形腔结构中光纤光栅固定在压电陶瓷上,通过控制压电陶瓷改变光纤光栅波长,从而改变环形腔光纤激光器的波长,构成基于压电陶瓷的可调谐环形腔光纤激光器。应变传感器贴附在压电陶瓷上,实时监测压电陶瓷的步长变化,通过惠斯顿桥式电路反馈给驱动控制系统,并补偿和修正压电陶瓷固有的磁滞和蠕变特性,形成压电陶瓷闭环控制系统。实验结果表明基于压电陶瓷闭环控制的可调谐环形腔光纤激光器调谐线性度好,波长调谐范围可达0.9 nm,线宽为4 k Hz,波长稳定性为±0.01 nm,功率稳定性为±0.3 d B。     

单模光纤连接损耗研究

本文从单模光纤高斯模场解析分析法入手,推出了单模光纤归一化频率与高斯模场直径的解析表达式,此后,导出了单模光纤连接中同时存在横向偏移,轴线倾斜,端面间隙,以及光纤直径不匹配时的连接损耗更加完整而普通的计算公式,从而为单模光纤连接器及单模光纤熔接机对准系统的设计提供了依据。     

不同基质掺Yb~(3+)光纤的单频极限输出功率

综合分析了不同基质掺Yb3+光纤的材料特性,在改进的极限输出功率理论模型的基础上,对Yb3+掺杂的硅光纤、磷酸盐光纤、YAG晶体(或陶瓷)光纤以及蓝宝石光纤的单频极限输出功率特性进行了详细分析。计算结果表明,YAG晶体(或陶瓷)光纤和蓝宝石光纤单频极限输出功率可以达到10kW以上。分析了单模情况下的极限输出功率,结果表明YAG晶体(或陶瓷)光纤和蓝宝石光纤在单模情况下也有较大优势,目前的单频激光功率还有很大的提升空间。对于单频激光光纤材料而言,降低受激布里渊散射(SBS)增益系数、提高导热性能是提高极限输出功率的有效途径。     

一种新型光交叉连接器的设计

由于光交叉连接器(OXC)在密集波分复用(DWDM)网络中起关键作用，文中提出一种采用双向环行器的新型光交叉连接器设计方案。其基本结构由一个双向环行器与一个光纤布拉格光栅(FBG)组成，构成一个2×2光交叉连接器，再根据这一基本结构设计出可满足实际需要的N×N光交叉连接器。此方法具有结构简单、体积小、价格便宜及所需环行器数量少(比传统的少67％) 等优点。最后，把新型光交叉连接器的插入损耗与传统结构连接器的插入损耗进行了比较。仿真结果表明，新结构比传统结构具有更小的插入损耗。     

光纤光栅双折射效应的实验研究

本文对均匀光纤光栅和线性啁啾光纤光栅的双折射效应分别进行了实验研究. 利用压电陶瓷的压电效应实施对均匀光纤光栅和线性啁啾光纤光栅的侧向挤压, 使之产生双折射, 通过改变施加在压电陶瓷上的电压值, 可以实现对光纤光栅双折射大小的控制. 侧向挤压线性啁啾光纤光栅可以补偿光纤通信系统中的偏振模色散.     

Multiple fiber connectors for multimode fibers

We report on a multiple fiber connector for multimode fibers with a low insertion loss of ? 0.22 dB. The simple, standard photolithographic fabrication process involved can yield reproducibly the tight tolerances that are required for low loss connectors.     

Calibrated optical fiber power meters: Errors due to variations in connectors

We discuss potential errors in the measurement of optical fiber power when using a calibrated power meter with connectors of various types and from different vendors. Data are given on the error and standard deviation due to biconic connectors from a limited number of vendors. We speculate that the error is due to reflecting surfaces on the connector end. To confirm the hypothesis, we tested two connectors whose reflective ends have noticeable differences. The data illustrate the variability seen among connectors. Our data indicate that a user should expect measurement error in most cases. We issue a call for caution based on the results.     

Calibrated optical fiber power meters: Errors due to variations in connectors

We discuss potential errors in the measurement of optical fiber power when using a calibrated power meter with connectors of various types and from different vendors. Data are given on the error and standard deviation due to biconic connectors from a limited number of vendors. We speculate that the error is due to reflecting surfaces on the connector end. To confirm the hypothesis, we tested two connectors whose reflective ends have noticeable differences. The data illustrate the variability seen among connectors. Our data indicate that a user should expect measurement error in most cases. We issue a call for caution based on the results.     

Soliton squeezing generated in an all-fiber contiguration

We experimentally demonstrate amplitude squeezed soliton utilizing intensity-dependent self-phase modulation in an asymmetric Sagnac interferometer.The system.whose components are connected via ferrule connector/physical connection(FC/PC)fiber connectors,constitutes all-fiber configuration to generate squeezed soliton.Soliton amplitude reduction measured by homodyne detection is near 4.0 dB below the shot-noise level.Optimal squeezing fields in both simple and compact all-fiber configuration are obtained.     

Two-Dimensional Super High Density Multi-Fiber Connector

We have developed 32-fiber and 60-fiber super high density multi fiber connector. This 32-fiber connector can be applicable for single-mode fiber and 60-fiber connector for multi-mode fiber. We have also established PC (physical contact) connection technology by optimizing polishing condition and clamping force.     

Optical interconnect based on a fibre bus

A technology which may form a powerful optical interconnection scheme based on a bus architecture is presented. It is shown that the fibre array connectors involved require alignment tolerances comparable to those of present electrical connectors. Further system flexibility can be obtained by tailoring the connector wavelength characteristics. Results of an experiment, where distributed amplification within the backplane of an optical bus was used to compensate for the power removed at the access points, are also presented. This allows a significantly higher number of output ports to be served than would be possible using a passive bus. As an example application, the feasibility of using the technology as the backplane interconnection in a card and rack system is demonstrated. Extension to a switching scheme using the multi-dimensional optical network concept is described.     

Test method for reliable estimate of the return loss of a fiber-optic connector

A novel test method for estimating return loss of F.O. connector is proposed. Limitations of the current industry standard test procedure (FOTP-107) are discussed. In the new procedure, geometrical shape of the connector end face is analyzed using non-contacting optical method. The measurements are fully automated eliminating subjective operator input. Growing family of PC polished low return loss connectors benefit the most from the proposed test method. No reference connector is necessary. The results are very repeatable. Connectors are tested for the worst case performance and are guaranteed to maintain low return loss in the field.     

Application of reduced scale tests to improve the thermal performance of high-voltage substation connectors

The thermal behavior of high-voltage substation connectors is a critical aspect that must be considered during the design stage. Most research about the thermal performance of substation connector devices is based on full-scale models. This paper proposes a downscaling method to evaluate the thermal performance of reduced scale substation connectors. The theoretical results attained in this paper were validated by means of FEM simulations and experimental tests. Reduced scale simulation and testing will be an essential tool for assessing the thermal performance of substation connectors and other electrical equipment during the design and validation stages.