基于准分子激光加工技术的内嵌光纤型微流控器件的制备

为了方便、快速、低成本地检测样品,提出一种内嵌光纤型微流控芯片的制备方法.利用248 nm的KrF准分子激光在聚甲基丙烯酸甲酯(PMMA)基片上进行微加工,构建芯片结构,并嵌入腐蚀过的直径35μm的单模光纤,从而形成内嵌光纤型芯片.探讨了准分子激光加工参数以及嵌入光纤的方法.结果表明,用准分子激光加工芯片,可控性好、简便可靠、加工过程可实现无人化.内嵌光纤实现了光纤的相互对准以及光纤对流道中央的对准,可以灵敏地获取样品的光学信号.     

MEMS光开关及其与光纤组装方式的研究

光开关是一种在光路中应用极其广泛的光无源器件,可用于扫描、投影、通讯等多种不同的领域,其中用于全光通讯中连接光纤之间的光开关日渐成为人们关注的焦点.高性能、低成本、又能大量生产的MEMS光开关很好地满足了全光网络对器件的要求.本文对这种MEMS光纤光开关的类型、特点以及研究现状进行了介绍,并给出了MEMS光开关与输入输出光纤的组装与自组装以及主要方式.     

Recent progress on high-speed optical transmission

The recently reported high spectral efficiency (SE) and high-baud-rate signal transmission are all based on digital coherent optical communications and digital signal processing (DSP). DSP simplifies the reception of advanced modulation formats and also enables the major electrical and optical impairments to be processed and compensated in the digital domain, at the transmitter or receiver side. In this paper, we summarize the research progress on high-speed signal generation and detection and also show the progress on DSP for high-speed signal detection. We also report the latest progress on multi-core and multi-mode multiplexing.     

基于光载波抑制的光标记交换新技术

介绍一种新的光标记交换技术,它是利用光载波的抑制来产生具有固定频率间隔的双波长光波,并对这两路光波分别进行调制,以加载光标记和光数据载荷.在网络的节点处使用波长变换技术进行标记交换.该技术结构简单,易于实现,克服了现有的光标记交换技术中的一些不足之处.     

光纤中光控光延迟新技术

光纤中光控光延迟技术因其灵活、易操作、可有效地推动现代光通信系统的发展等优点,近年来引起人们极大的关注。本文回顾了光纤中光控光延迟技术的研究进展,介绍了光控制光速的基本原理,着重阐述了在光纤中利用受激布里渊散射、受激拉曼散射、光学参量放大、波长转换、孤子碰撞、掺铒光纤中的相干布居数振荡等非线性效应实现光控光延迟的新方法的物理机制和最新进展,分析了各种方法的优缺点。最后讨论了在光纤中实现光控光延迟技术的研究意义和发展前景。     

Pulsed radiation-induced attenuation in certain optical fibers

Using the X-ray pulse from the HERMES II simulation machine at Sandia National Laboratories, the author measured the pulsed radiation-induced attenuation in two optical fibers considered to be `non-rad-hard': the 50 μm core graded-index fiber from Corning and the plastic (PMMA) fiber from the Mitsubishi Rayon Company. These fibers were exposed to radiation up to doses of 19.5 and 28 krad(Si), respectively. In addition, fits of their postradiation recovery were made to the geminate recombination model, from which the recombination rate and generation constants, characteristic of this theory, were determined. These parameters should be useful in determining the response of the fibers to radiation conditions other than those encountered here     

Tunable attenuator based on polymer microstructured optical fibers

The polymer microstructured optical fiber is a kind of fiber whose core and cladding are composed of air holes and organic compornoleel by a certain rule. Similar with silica microstructured optical fibers (SMOF), according to the light guide mechanism PM…     

Engineering modes in optical fibers with metamaterial

In this paper, we report a preliminary theoret-ical study on optical fibers with fine material inclusions whose geometrical inhomogeneity is almost indistinguish-able by the operating wavelength. We refer to such fibers as metamaterial optical fibers, which can conceptually be considered as an extension from the previously much publicized microstructured optical fibers. Metamaterials can have optical properties not obtainable in naturally existing materials, including artificial anisotropy as well as graded material properties. Therefore, incorporation of metamaterial in optical fiber designs can produce a new range of fiber properties. With a particular example, we will show how mode discrimination can be achieved in a multimode Bragg fiber with the help of metamaterial. We also look into the mean field theory as well as Maxwell-Garner theory for homogenizing a fine metamaterial structure to a homogeneous one. The accuracies of the two homogenization approaches are compared with full-structure calculation.     

如何选用光纤

文中以光纤最新标准为依据 ,介绍光纤的技术发展 ;同时 ,阐述了光纤的分类、结构和性能 ;最后 ,按光纤的特点提出了选用方案建议。     

光纤技术的发展及其在光通信中的应用

随着光纤网络的快速增长，光纤技术的发展越来越重要。光子晶体光纤是一种新型光纤，它将会极大地影响光通信的发展，为此对传统光纤进行了分析，对光子晶体光纤的性质和应用前景也进行了讨论和评价。     

Fabrication of multiple parallel suspended-core optical fibers by sheet-stacking

We demonstrate the fabrication of a novel type of optical fibers with multiple parallel air-suspended cores by the sheet-stacking method. Using this technique we have constructed optical fibers with up to 10 parallel micron-size suspended cores. No extra scattering loss from the fabrication process was observed in a fabricated dual air-suspended core fiber. The sheet-stacking method opens the way towards using a wide range of optical glasses for manufacturing multiple parallel suspended-core specialty optical fibers with novel optical functionalities such as dispersion tunability. Fusion splicing has also been successfully used to connect such a multiple core fiber with a conventional silica fiber.     

高速光纤通信系统中高阶PMD补偿技术研究

随着光放大器和色度色散补偿技术的不断提高，光纤的偏振模色散（PMD）已经成为超高速、超长距离光纤通信系统发展的主要障碍，在40Gbit/s或更高速率的光纤通信系统中，PMD的影响已不可忽略，必须考虑PMD的补偿问题，从高阶PMD对40Gbit/s NRZ系统影响的数值模拟发现，当光纤中PMD高阶效应比较明显时，将严重劣化一阶PMD补偿的效果，另外，通过对两种高阶PMD补偿器的比较介绍，认为两段级联的高队PMD补偿系统是一种比较现实的补偿方法。     

单偏振单模微结构聚合物光纤理论设计

采用全矢量有限元法并结合完美匹配边界条件,设计实现了一种新型结构的单偏振单模（single polarization single mode,SPSM）微结构光纤（Microstructured optical fibers,MOFs）,以聚合物聚甲基丙烯酸甲酯（polymethyl methacrylate,PMMA...     

Impulse response analysis of graded index polymer optical fiber

Polymer optical fibers (POF) are of great interest the last decade in optical communication networks for short and medium distance applications. Based on the theory of generalized impulse response of multimode channels, an analytical method for time response evaluation is proposed for a graded index polymer optical fiber (GIPOF) with polymethylmeta-crylate (PMMA) core material.     

Fault tolerance design for large-scale optical switches

In this paper, we present an enhanced fault tolerance in large-scale optical switches through innovations in architecture and control logic design. A large-scale switch is constructed from a network of 2×2 optical switch elements (SEs). Classic switch network architectures, such as the Benes, are not designed with fault tolerance in mind. There are three major contributions in this paper: (1) we developed an analytical method, referred to as the probability accumulation method, to calculate the average connection blocking probability in a faulty switch network; (2) we provided a failure-aware routing algorithm to effectively circumvent connections from defected SEs in a dilated Benes switch; and (3) we improved the connectivity pattern of the Benes network to further reduce the blocking probability, especially when the SE failure rate is low.     

Advancements in semiconductor core optical fiber

Presented here is a review of recent progress in the nascent field of glass-clad semiconductor core optical fibers. Such fibers, generally focused to-date on silicon and germanium cores, define a new class of optical fibers that have the potential to significantly advance the fields of nonlinear fiber optics and infrared power delivery. They also can provide considerable insight into the fundamentals of crystal growth and the interplay between thermodynamics and kinetics under non-equilibrium conditions. More specifically, this review begins with a brief history of the international efforts to-date and is followed by a more in-depth discussion of the processing and properties of crystalline unary (silicon and germanium) and binary (indium antimonide) semiconductor optical fibers prepared by a molten core approach that enables long lengths at relatively high speeds by comparison to other fabrication methods. Further, the fundamental performance limits are postulated as are a range of present and future applications.     

Chirped rectilinear core longitudinally-graded optical fibers

Reported here is a straight-forward and flexible method to fabricate silica optical fibers of circular cladding cross-section and rectilinear cores whose aspect ratio and refractive index profile changes with position along the fiber in a deterministic way. Specifically, a modification to the process recently developed to produce longitudinally-graded optical fibers, LGFs [Opt. Express 20 (2012) 17394–17402], was employed. Herein reported are MCVD-derived germanosilicate fibers with rectangular cores where the aspect ratio changes by nearly 200% and the average refractive index changed by about 5%. Fiber losses were measured to be about 50 dB/km. Such rectangular core fibers are useful for a variety of telecommunication and biomedical applications and the dimensional and optical chirp provides a deterministic way to control further the modal properties of the fiber.     

High electromagnetic shielding of plastic package for 2.5-Gb/s optical transceiver modules

A lightweight, low-cost plastic package for a 2.5-Gb/s optical transceiver module, that also has good electromagnetic shielding properties, has been fabricated using woven continuous carbon fiber (CCF) epoxy composite. The shielding effectiveness (SE) of the CCF epoxy composite has been modeled theoretically and measured from 500 MHz to 3 GHz using the ASTM D4935 and a near-field test method. Two types of weaving patterns were studied: a balanced twill structure (BTS) and a parallel structure. The BTS was able to achieve an SE of about 80 dB under plane wave conditions and about 50 dB under near-field conditions because of the numerous conductive between crossing fibers. The SE of the proposed package is at least 20 dB greater than the previous package which used a liquid crystal polymer composite. In addition to better shielding performance, the proposed package costs less because it uses less carbon fiber. The proposed package for an optical transceiver is suitable for use in a low-cost lightwave transmission system     

双包层单模光纤光学参数对传输特性的影响

对特征方程直接求导解得了基模群时延和群速色散,讨论了双包层单模光纤不同折射率分布对传播常数、群时延、群速色散以及零色散点波长的影响.研究结果表明:光学参数,即纤芯和外包层的相对折射率(P)以及内包层和外包层的相对折射率(R)对该类光纤的传播常数、群速度、群速色散和零色散点波长均有比较明显的影响,影响的大小及规律随参数的不同又有所不同.这些规律为设计满足不同色散要求的双包层单模光纤提供了理论依据.     

高非线性光纤及其应用

介绍了各种高非线性光纤的原理，并对其在超连续（SC）脉冲的产生和波长变换上的应用作了讨论。