共查询到18条相似文献,搜索用时 125 毫秒
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光纤预制棒的大型化是降低光纤拉丝成本的必要手段,本文介绍了利用OVD法生产大尺寸光纤预制棒的工艺方法,主要包括大尺寸光纤预制棒在沉积、烧结、保温过程中的设备与工艺介绍. 相似文献
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结合光纤散射机理分析,从光纤预制棒折射率分布、掺杂浓度、拉丝张力和拉丝热处理等方面着手研究,通过优化预制棒沉积工艺和改善拉丝条件来制备低损耗单模光纤,并采用光时域反射仪(OTDR)进行检测,结果表明,单模光纤在满足ITU-T G.652标准的同时,在1 550nm波长的衰减可进一步降低。 相似文献
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介绍了单模光纤的传输性能(衰减、色散)和光学几何特性(截止波长、模场直径、包层直径、模场同心度误差、包层不圆度)及其测试;光缆的机械性能(拉伸、压扁、冲击、反复弯曲、抗弯折)和环境性能(衰减温度特性等)及其检测。 相似文献
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介绍了单模光纤的传输性能(衰减、色散)和光学几何特性(截止波长、模场直径、包层直径、模场同心度误差、包层不圆度)及其测试;光缆的机械性能(拉伸、压扁、冲击、反复弯曲、抗弯折)和环境性能(衰减温度特性等)及其检测。 相似文献
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A review of high-speed drawing and coating of optical waveguide fiber, and related work is given. This paper also includes a discussion on the effects of fiber pulling at a high draw rate on the optical and mechanical properties of the silica fiber. The coating mechanics that describes high-speed coating application in terms of process variables is explained. Finally, recent achievements with fibers coated at high speeds are presented. 相似文献
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刘立起 《电子工业专用设备》2011,40(2):24-26
改造方案是在原进口中频感应加热炉拉丝机上再加装一台石墨加热炉,使之成为一机两炉工作状态,同时在一台电脑控制下,使用同一拉丝控速系统,可在同一主体设备上分别将大,小直径规格的预制棒拉制成光纤. 相似文献
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Microstructure analysis in the coupling region of fiber coupler with a novel electrical micro-heater
Fused-tapered fiber coupler is widely used in optical-fiber communication, optical-fiber sensor and optical signal processing. Its optical performance is mainly determined by the glass properties in the coupling region. In this study, the effect of fused biconical taper (FBT) process on glass microstructure of fiber coupler was investigated by testing the microstructure of the cross-section of coupling region. The fiber coupler is fabricated with a novel home-designed electrical heater. Our experimental results show that the boundary between fiber core and fiber cladding become vague or indistinct after FBT under transmission electron microscopy (TEM) and Ge2+ in fiber core diffuses into fiber cladding. Crystallizations are observed in coupling region under scanning electron microscope (SEM) and microscopic infrared (IR), and the micro crystallizations become smaller with the drawing speed increasing. The wave number of fiberglass increases after FBT and it is in proportion to the drawing speed. The analysis of the microstructure in the coupling region explored the mechanism of the improvement in the performance of fiber couplers which can be used for the guidance of fabrication process. 相似文献
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Fang-Zheng Lin Yi-Jen Chiu Tsu-Hsiu Wu 《Photonics Technology Letters, IEEE》2007,19(5):276-278
The cladding layer effect on microwave propagation properties of semiconductor p-i-n waveguides is investigated in this letter. Through the optical excitation in quantum wells of p-i-n waveguides, high-speed photocurrent is used to examine the microwave propagation. Two devices of p-i-n waveguides with different cladding layers are fabricated and measured, showing that a higher speed is found in the waveguide of wider cladding width. Verified by the microwave propagation properties, the higher speed is mainly attributed to lower microwave propagation loss due to the lower impedance in the wider cladding layer, suggesting this kind of structure can be applied to high-speed waveguide-based devices 相似文献
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This paper presents the theoretical and experimental investigations on polarization characteristics of PANDA fiber with flat cladding. It is theoretically shown that the modal birefringence in the flat-clad fiber is almost the same as that in the circular-clad fiber. The flat-clad PANDA fiber has been fabricated by grinding off the preform cladding on the opposite faces and then drawing with a low furnace temperature. The modal birefringence of the fiber isB = 5.9 times 10^{-4} and the separation of the bending loss edges for the two polarization modes isDeltaupsilon = 0.51 in the normalized frequency. The polarizing region can be tuned from 1.3 to 1.56 μm by varying the fiber-bending diameter from 3.5 to 4.5 cm. A 1.5-m length of polarizing fiber exhibits extinction ratios of 44.9 and 44.4 dB with insertion losses for the guided mode of 0.25 and 0.41 dB at 1.3 and 1.56 μm, respectively. 相似文献