基于聚合物填充的微结构光纤温度传感器

温度作为环境变化的重要基本参数,其快速精确的检测方法备受科学界及工业界的关注.本文提出并验证了一种基于聚合物微腔的Fabry-Perot干涉结构的单模光纤温度传感器.该传感器使用质量分数为40％的氢氟酸(HF)溶液在单模光纤(SMF)末端端面腐蚀一定深度的凹型槽,然后将一定浓度的聚甲基丙烯酸甲酯(PMMA)溶液转移到腐...     

Experimental network synchronization via plastic optical fiber

In this paper, network synchronization of coupled Chua’s circuits in star configuration is experimentally studied. In particular, plastic optical fiber (POF) is used in the network like communication channels among chaotic nodes to achieve synchronization. The master signal is sent to multiple slaves through a fiber optical coupler with corresponding electrical/optical and optical/electrical stages. An application to encrypted chaotic communication to transmit analogical signal and image messages to multiple receivers is also given.     

千兆位塑料光纤以太示范网络

文章介绍了所组建的全氟树脂塑料光纤千兆以太网的设计方案、设备选择及安装，给出了网络的性能测试数据，分析了全氟树脂塑料光纤及其所构筑的千兆以太网存在的问题，分析了全氟树脂塑料光纤千兆以太网的应用前景，提出了我国应加紧该领域研究的建议。     

一种适用于塑料光纤局域网的收发器研究

提出了一种适用塑料光纤局域网的光纤收发器.收发器首先将输入的数据源进行CMI编码,再经过发送单元发送光信号;其次将接收到的光信号经过解码后送至光接收单元还原出原始数字序列.完成了仿真实验及实验室中与现有局域网中广泛使用的RJ-45接头的连接.实验证明该光纤收发器的可行性和有效性.     

塑料光纤在通信网中的应用

通过对塑料光纤(POF)传输特性的分析,了解和熟悉塑料光纤在损耗、带宽、色散及温度等方面的性能特征。根据塑料光纤在短距离高速通信网传输数据中的的优越性能,设计了以塑料光纤为传输介质的全光网络传输系统和语音电路传输系统。     

塑料光纤在楼宇布线中的应用

塑料光纤（POF）技术日益成熟,其产品在通信领域的应用量不断扩大.文章简述了POF的性能,探讨了各种POF在楼宇布线中应用的可行性,总结了当前楼宇布线标准和POF标准的发展概况,最后分析了当前布线标准所存在的缺陷和POF标准制定的紧迫性.     

Long-distance gigabit-range optical fiber transmission experiments employing DFB-LD's and InGaAs-APD's

High-speed and long-distance transmission characteristics have been examined at 1.2, 2, and 4 Gbit/s, employing mesa structure DFB-DC-PBH LD transmitters and planar InGaAs APD receivers. High receiver sensitivities, -40 dBm at 1.2 Gbit/s, -37.4 dBm at 2 Gbit/s and -32.4 dBm at 4 Gbit/s, have been obtained employing high-speed and low noise InGaAs APD/FET receiver circuits. Long-span transmissions, 1.2-Gbit/s 170-km, 2-Gbit/s 141-km, and 4- Gbit/s 120-km at 1.55 μm, and 4-Gbit/s 74-km at 1.3 μm, have been performed. Power penalties caused by the LD wavelength chirping in the 1.5- μm wavelength region and error rate flooring caused by the LD side-mode oscillation in the 1.3- μm wavelength region are discussed. The transmission length is limited not only by the DFB LD wavelength chirping but also by the two-mode oscillation, which was observed at the pulse leading edge when LD bias current was near the threshold current. From the 1.3 μm wavelength 4-Gbit/s experiment, it was found that the pattern effect of the side-mode oscillation caused the error rate floor, when the LD bias current is set near the threshold current, and that the error rate floor disappeared when the bias current is set slightly above the threshold.     

Design and characterization of a plastic optical fiber activecoupler

In this letter, we report on the first active coupler developed with the plastic optical fiber technology. The device constructed combines the characteristics of the most important devices arising from this technology, which are switches and couplers. The solution adopted is based on the structure of a passive contact coupler and on the switching properties of a nonquiral nematic liquid crystal. The device designed yields an experimental coupling of 4.5 dB with excess losses under 2.5 dB if the device acts as a coupler; and a dynamic range of 3 dB and switching times of 2 ms if the device acts as a switch     

基于OpenCV的光纤端面检测系统研究

针对光纤端面制备中各种因素的影响会导致光纤端面产生缺陷的问题,研究了一种基于机器视觉技术的光纤端面检测系统。针对光纤端面显微图像的结构特点,使用图像处理算法拟合其中的椭圆,并提出了一种基于同心椭圆约束的椭圆检测方法,挑选出纤芯和包层轮廓的拟合椭圆。依据获取的拟合椭圆参数将光纤端面划分为三个检测区域,进行分区域的瑕疵点检测和统计。全部算法使用VS2010和OpenCV开发实现。实验表明,该检测系统可以对光纤端面进行准确的质量测定。     

基于SCBSS信号处理技术的SMS多参量光纤传感系统

基于单通道盲信号分离技术(Single Channel Blind Source Separation,SCBSS)及单模-多模-单模(Single-mode-Multimode-Single-mode,SMS)光纤结构的模间干涉理论,提出了一种多参量光纤传感技术,实现了振动与应力、振动与温度的同时测量。在振动与应力同时测量时,振动频率误差为0.17 Hz,分离出的应力信号与实验操作吻合。在振动与线性降温、自然升温同时测量实验中,振动频率误差均在0.60 Hz以内。线性降温时,温度误差在7.13%以内;自然升温时,温度误差在8.03%以内。该方法结构简单,成本低廉,精度高,可推广用于其他光纤传感系统,实现多参量同时测量。     

通信塑料光纤的最新进展

本文综述了各种通信用塑料光纤研究的最新进展。同时，也给出了塑料光纤在各种短距离通信中的应用实例。     

Low temperature characteristics of UV-curable resin coated optical fiber

Transmission characteristics of coated optical fiber depend on coating materials at low temperature. Loss increase phenomena are compared for UV-curable resin coated and silicone-nylon coated fibers. Different mechanisms induce loss increase depending on coating materials. Lateral forces are caused by shrinkage and Young's modulus increase at low temperature for UV-curable resin coated fibers. These forces cause fiber microbending for correlation lengths of not more than 1 mm. However, for silicone-nylon coated fibers, axial forces cause fiber buckling for correlation lengths longer than 5 mm. The relationship between the UV-coating structure and loss increase at low temperature is also described.     

PMD outage probabilities of optical fiber transmission systems employing bit-to-bit alternate polarization

The impact of differential group delay (DGD), induced by polarization-mode dispersion, on the performance of differential phase-shift keyed and on-off keyed modulation formats employing bit-to-bit alternate polarization (APol) is investigated by means of numerical simulation. Thereby, it is observed that the optical signal-to-noise ratio (OSNR) penalty due to DGD is almost independent of the power splitting ratio between the principal states of polarization (PSP) of a DGD emulator, when APol modulation formats are employed. Although this leads to a higher mean OSNR penalty for a given DGD value compared to conventional modulation formats, it is shown that the allowed mean DGD for required low system outage probabilities does not change significantly.     

Development of miniature optical fiber hybrid WDM coupler employing the FBT technology

An innovative technique for fabricating the optical fiber hybrid wavelength-division multiplexing (WDM) coupler is presented. The device is comprised of two components, a wavelength division multiplexer and an optical fiber coupler, in a miniature stainless steel tube. The outstanding features of the ultra-low polarization dependent loss (PDL) under 0.05 dB and the compact size of ∅3.5 × 65 mm for bare-fiber type of package are accomplished by using the pioneering methodology combining the main techniques of twisted and parallel fusion processes in the fused biconical taper (FBT) technology. Besides, its miniaturization is more competitive in both of the applications of optical communication and sensing systems where a compact-sized package is required for extending the flexibility of installation.     

BER estimation in optical fiber transmission systems employing all-optical 2R regenerators

A bit error rate estimation method for optical fiber transmission systems employing all-optical 2R regenerators is presented. The method is based on the linearization of the nonlinear transfer function of the regenerators in three sections. Using this linearized three-section model, the impact of 2R regeneration on the system performance as a function of the extinction ratio, the clamping factor, and the steepness of the transfer function is studied.     

基于塑料光纤的激光散斑特性研究

为了解决激光成像系统中的散斑问题,利用ULN2003芯片驱动喇叭振动光纤对激光成像系统中的散斑特性进行了研究。采用波长为532nm的激光作为系统光源,通过线阵CCD图像传感采集系统对激光散斑图像进行采集,对塑料光纤在不同振动频率下的激光散斑对比度进行了分析。结果表明,在光纤振动幅度不变、振动频率在0Hz~20Hz内逐渐增加时,图像散斑对比度逐渐减小;当振动频率大于16Hz时,图像的散斑对比度趋于稳定,达到良好的散斑抑制效果,可用于激光显示及激光成像等领域。     

一种用于FTTH的实用塑料光纤连接器的研究

塑料光纤以其芯径大、柔韧性好、连接方便和耦合效率高等优点,为光纤到户(FTTH)接入问题提供了很好的解决方案.文章通过MATLAB对塑料光纤连接器中的光纤耦合效率问题进行了模拟仿真.提出了一种用于FTTH的实用塑料光纤连接器结构,该连接器具有连接损耗低、操作简单、安装方便和性价比高等特点.     

GaN resonant cavity light-emitting diodes for plastic optical fiber applications

The optical designs of resonant GaN light-emitting diodes (LEDs) have been determined for maximum extraction efficiency into typical plastic optical fiber of numerical aperture 0.5. An optimum extraction efficiency of 3.9% can be achieved for a practical resonant cavity LED (RCLED), taking account of current growth and processing considerations. The optimized device is a metal-active layer distributed Bragg reflector construction. Constructive interference effects from the top metal mirror are found to play the dominant role in efficiency enhancement. The extraction efficiency of an optimized resonant single-mirror LED is found to be 3.3%, indicating a small compromise in performance compared with the more complex RCLED structure.     

塑料光纤在智能电网通信中的应用分析

我国＂十二五＂电网发展规划明确指出,要加快智能电网的建设,实现电力光纤入户。智能电网建设的关键技术之一是电力通信。目前,由于我国电力通信专用网呈现＂骨干网强、接入网弱＂、＂高（电压）端强,低端弱＂的态势,配电、用电环节的通信水平相对输电网而言差距较大,而智能配电和用电建设是智能电网用电环节的一个重要组成部分。因此,智能电网中的＂最后一百米＂显得尤为重要。伴随着光纤生产技术的发展,塑料光纤以其芯径大、柔韧性好、接续方便等特点,即将成为接入网的传输媒质。