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双锥光纤滤波器的研制 总被引:4,自引:1,他引:3
实验研究了熔锥条件对双锥光纤滤波器的影响。提出一个高斯模型,预测锥的几何形状。获得了窄带带通双锥光纤滤波器以及带阻中心波长分别为135nm和1559nm的带阻双锥光纤滤波器。 相似文献
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单模与多模光纤耦合器的光束合波 总被引:2,自引:1,他引:1
现有的光纤耦合器在作为分波器使用时具有较低的插入损耗,在作为合波器时插入损耗较大,为实现低损耗合波目的,提出一种由单模与多模光纤共同构成的混合型光纤耦合器。利用耦合波方程理论分析其工作原理,计算机模拟其耦合过程。采用熔锥法制作工艺,完成单模与多模光纤耦合器的制作,实验结果与理论模拟相吻合;该器件单模到多模光纤的耦合效率、多模到多模光纤的耦合效率均在90%以上,实现了两路光束的功率合波。作为低插入损耗合波器件可广泛应用于光通信以及双包层光纤激光器抽运光的注入。 相似文献
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利用传输矩阵法和有限元法分析了光栅周期、调制深度、锥腰直径和不同设计区段长度比等光栅制作参量和结构设计参量对双锥型光纤布喇格光栅光谱特性的影响.软件仿真结果表明:限定相关参量后,光栅周期增大,双锥型光纤布喇格光栅整体反射谱右移,与均匀分布光纤布喇格光栅光谱变化规律一致;调制深度增强,两主反射峰基本不变,而两主反射峰中间的次级峰个数增多,光强增大;锥腰直径减小,激发更多包层模,干涉峰个数增多,强度提升;整根光栅长度保持1cm不变,锥腰区,标准光栅区和渐变光栅区长度比直接影响次级峰的数量和幅值,随着渐变光栅区长度占比的增大,次级峰的幅值增大,同时个数减少.双锥型光纤布喇格光栅可在多参量传感器、多通道滤波器、多通道半导体激光器、色散补偿和光上下载分插复用等方面广泛应用. 相似文献
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分析了光子晶体光纤拉制中各工艺参数之间的相互影响,建立了工艺参数与最终光纤结构之间的对应关系.在温度和送料速度的协调控制下,通过调节气压参数可有效控制气孔结构.实验拉制出孔径孔距比分别为0.45和0.8的单模以及高占空比光子晶体光纤.在制备非均匀孔径光子晶体光纤时,仅靠调控工艺参数往往难以拉制出理想结构,本文以一种单偏振单模PCF结构为例,对预制棒结构进行了优化设计.计算表明可由此拉制出满足要求的光子晶体光纤.
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光子晶体光纤
工艺参数
气压控制
气孔结构 相似文献
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V. J. Tekippe 《Fiber and Integrated Optics》2013,32(2):97-123
The rapid development and deployment of optical fiber for a variety of applications has resulted in a similarly rapid development of myriad components to effectively utilize the fiber. Thus, for example, significant work has been done over the past several years in the development of sources and detectors, connectors, and splices. These components share the common trait of being external to the fiber and hence not part of the fiber per se. Another class of components, however, is made from the fiber itself. A number of components, such as polarizers, analyzers, and mode or wavelength filters, require only simple bending of the fiber in a specified manner. On the other hand, such techniques as polishing, etching, and heating can also be used to alter the transmission properties of the fiber. While a number of interesting devices have been made by these procedures, the present paper is limited to devices made by the biconical taper process. If a fiber is heated and stretched, a biconical taper is formed, which can significantly alter the transmission characteristics of the fiber. Interesting wavelength filters and sensors can be made with single tapers or combinations of tapers. Moreover, if two or more tapered fibers are fused, then coupling of light from one fiber to another can be achieved. The tapering and fusing processes can be used to make wavelength-enhanced couplers, which can be used as wavelength-division multiplexers or nearly wavelength-independent couplers or splitters. In this paper, we discuss the components made by the biconical taper process, their fabrication, in both theory and practice, and their performance. Practical implementations of these components are also discussed, including their manufacturability and reliability. 相似文献
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Abstract An optical coupler distributes light from a main fiber to one or more branch fibers. Optical signals can also be passed bidirectionally along a single fiber [1]. Usually couplers are passive devices which are attached to other components in a system by means of optical fiber connectors, or may be joined to them by splicing. Several basic coupler designs have been discussed in the literature, each having some advantages and disadvantages. The biconical taper coupler [2] consists of two fibers that are fused and subsequently tapered. These fibers may have step or graded index profiles. Beam-splitter types [3] (consisting of discrete components) are generally expensive. Mixing rods are simple and can be ruggedly constructed, but an extra 3dB loss above packing fraction loss is incurred when used with graded index fibers [4]. 相似文献
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An optical coupler distributes light from a main fiber to one or more branch fibers. Optical signals can also be passed bidirectionally along a single fiber [1]. Usually couplers are passive devices which are attached to other components in a system by means of optical fiber connectors, or may be joined to them by splicing. Several basic coupler designs have been discussed in the literature, each having some advantages and disadvantages. The biconical taper coupler [2] consists of two fibers that are fused and subsequently tapered. These fibers may have step or graded index profiles. Beam-splitter types [3] (consisting of discrete components) are generally expensive. Mixing rods are simple and can be ruggedly constructed, but an extra 3dB loss above packing fraction loss is incurred when used with graded index fibers [4]. 相似文献
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对1.5μm波导型声光TE-TM模式转换光滤波器进行了研究。采用了可降低驱动功率的表面声波导结构。在1.5 ̄1.6μm波段实现了可调滤光,通带宽度小于2nm,达到97¥以上转换率所需的射频驱动功率约80mW(19dBm),器件总插入损耗约9dB。 相似文献
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A high efficient LD (laser diode) pumped Tm3+ doped double clad silica fiber laser with an intravacity biconical taper was reported. A biconical taper located ~3 cm from the output end of the fiber laser was fabricated by heating and stretching method with a length 1.5 cm and waist diameter ~20 µm. The slope efficiency was 49.8% with respected to the launched pump power, and the maximum output power was 1.97 W. Pre and post output laser power ratio was ~10. This fiber laser was compared with other three biconical tapered fiber lasers (the same fiber with different tapers) and a uniform geometry fiber laser. With intracavity biconical tapers, fiber lasers’ thresholds were ~1 W higher than the fiber laser without the taper (1.97 W). The pump end’s slope efficiencies of fiber lasers with tapers were 3–5% in contrast with 37.6% of the uniform one. After tapered, the pre and post laser power ratios were much higher than the un-tapered one’s, but not changed much with the launched pump power. 相似文献
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K.A. Stasiewicz R. Krajewski L.R. Jaroszewicz M. Kujawińska R. ?wi??o 《Opto-Electronics Review》2010,18(1):102-109
Investigations of internal structure changes along an optical fiber during the manufacture of biconical taper have been described. Basing on the constant volume theory, classification of biconical structures manufactured on a special set-up is presented and discussed. The interferometric tomography method has been used for determination of 3D geometry and refractive index distribution in manufactured optical fiber tapers. The experiments provide detailed information on external (diameter of cladding) as well as internal (core diameter and refractive index profile) changes along the taper region. The results have been discussed in relation to the parameters of the manufacturing process. 相似文献
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单模光纤双圆锥体的传输特性 总被引:1,自引:0,他引:1
本文研究并制作了光纤双圆锥体滤波器,给出了耦合模总相位差与滤波性能之间的关系,讨论了推的对称性对滤波器峰值传输的影响,对不同结构的锥体谱特性进行数值计算以验证分析结果,最后给出了实验结果对照. 相似文献
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Jianghai Wo Qizhen Sun Xiaolei Li Deming Liu Perry Ping Shum 《Applied physics. B, Lasers and optics》2014,115(1):1-8
A modal interferometer based on multimode–singlemode–multimode fiber structure built with a biconical taper for fiber curvature measurement is proposed and experimentally demonstrated. Due to the tapered singlemode fiber acting as a high-efficient mode power converter to enhance the modes coupling, curvature sensor with improved sensitivity is achieved by monitoring the defined fringe visibility of the interference spectrum. The measuring range can be tuned by changing the waist diameter of the fiber taper. Meanwhile, the sensor shows an intrinsic ability to overcome the influence of temperature cross-sensitivity and the power fluctuation of light source. The advantages of easy fabrication, high-quality spectrum with improved sensitivity, and small hysteresis will provide great potential for practical applications of the sensor. 相似文献