光纤族系列绪论

目前,在有线电视和通信网络中,采用光纤干线已成主流。随着光纤的技术进步,光纤族也已形成系列。本文拟对正在不断开发和应用的光纤族系列产品作一简介。 1 光纤的分类 光纤是光导纤维(OF:Optical Fiber)的简称。但光通信系统中常常将Optical Fiber(光纤)又简化     

微孔光纤的研究进展

本文在回顾微孔光纤研究历史的基础上，着重介绍了微孔光纤理论与实验研究的最新成果。     

光纤技术进展及其发展趋势

回顾了光纤的发展历程及国内外光纤生产与应用情况,最后阐述了当前国际的光纤前沿技术。     

锥形光纤在光纤传感和光纤激光器上的应用

介绍了近年来得到广泛研究的锥形光纤技术的发展现状,尤其是在光纤传感和光纤激光器上的应用.在光纤上直接拉制出的锥区可用于制作小型化、一体化、具有许多优良光学特性的光纤器件.锥形光纤按束腰直径和光纤拉锥区的长度比,可分为锐锥度光纤(锥区长度和锥区的束腰直径较接近)和缓锥度光纤(锥区的长度远远大于束腰的直径).锐锥度光纤可以制作Michelson或者Mach-Zehnder干涉仪可用来实现折射率传感器;同时它还可改变激光光斑的强度分布,获得平顶光斑输出.利用单模缓锥度光纤可以实现窄线宽可调谐滤波器;另外基于缓锥度光纤可以实现多模光纤至单模光纤的转换器.锥形光纤结构紧凑,制作简单、成本低,必将成为多种实用光纤器件的核心.     

分布式掺铒光纤放大器的理论分析

给出了一种分析分布式掺铒光纤放大器的理论方法，可以对放大器的信号增益和泵浦吸收进行分析，并能够为分布式掺铒光纤放大器的设计提供理论依据。通过推导得出了基本公式，并就一些特殊情况作了讨论。该方法适用于１４８０ｎｍ和９８０ｎｍ泵浦的放大器系统。     

光纤传感器现状研究

回顾了光纤传感器的现状。光纤传感器具有抗电磁干扰、重量轻、尺寸小、灵敏度高、带宽宽以及易于实现多路或分布式传感等优点。应变、温度和压力是研究最广泛的被测对象，光终光栅传感器是研究最广泛的光纤传感器技术。光纤陀螺仪和光纤电流传感器是光纤传感器技术相当成熟和商用的良好示例。讨论了不同的光纤传感器技术，尤其是光纤光栅传感器、光纤陀螺仪和光纤电流传感器技术，重点讨论了原理和现状。目前，光纤传感器通信己取得一些成功，但在不同的领域．它们仍需与其它成熟的传感器技术竞争。人们正在不断开发和试验新的设计，不仅是传统的被测对象，还有新的应用。     

浅谈通信传输中的光纤知识

光信号的传输,目前在通信传输系统中,已可与电信号分庭抗礼,占据半壁江山。光纤作为光信号的传输介质,其重要性自是不言而喻。本文仅浅谈下光纤的分类,连接,衰减,连接,检测。     

一种全新结构的保偏光纤及其器件

本文在论述当代国外几种保偏光纤类型的基础上，着重讨论了我们自行发明的一种全新结构“类矩型”保偏光纤的特点，并介绍用“类矩型”保偏光纤研制的一系列保偏光纤器件的情况。     

基于光纤锥和多模渐变光纤的马赫-曾德尔干涉仪的传感特性研究

提出了一种基于光纤锥和纤芯失配光纤结构的马赫-曾德尔干涉(MZI)传感器。在距离单模光纤(SMF)锥25mm处熔接一段长30mm的多模渐变光纤(GI MMF),形成SMF-光纤锥-SMFGI MMF-SMF结构。其中,光纤锥起到增加包层模能量的作用,GI MMF为传感臂。传感器外界环境温度、折射率及应力的改变都会使传感器的纤芯基模和包层模的光程差发生改变,从而引起传感器干涉谱发生变化,通过监测干涉谱的变化可以实现对外界物理量的测量。实验研究结果表明,当环境溶液温度在30~89℃范围内变化时,传感器的温度灵敏度为78.6pm/℃,线性度为0.997;环境溶液折射率在1.333~1.394变化范围内,传感器的折射率灵敏度为81.48dB/RIU,线性度为0.989;轴向应变在0~933.3με变化范围内,传感器的应变灵敏度为0.33×10-2 dB/με,线性度为0.998。本文传感器可以实现多个物理量的同时区分测量。     

Multi-wavelength fiber laser based on broadband fiber grating and HiBi fiber loop mirror

Multi-wavelength fiber lasers have attracted a lot of in- terest in recent years because of its potential applications in optical wavelength division multiplexing (WDM) systems, fiber sensors, and other fiber-optics instruments. Because of the predominant…     

基于稀土掺杂石英光纤的单频光纤激光器

系统研究了利用稀土掺杂的石英光纤作为激光增益介质来实现分布布拉格反射式单频光纤激光器。实验中,分别将掺有Nd3+、Yb3+、Er3+/Yb3+和Tm3+的商用石英光纤,熔接到激光谐振腔中,实现了基于石英玻璃光纤的光纤激光系统在多波段的单纵模运转。对各光纤激光器的单频特性进行了研究,其中,激光器线宽可达几十千赫（特别是对于Er3+/Yb3+共掺光纤激光器,其线宽窄于7 kHz）,激光系统的强度噪声接近于散粒噪声极限,实验中获得了激光波长由930 nm到2m的单频光纤激光器。实验结果证明:商用的稀土掺杂石英光纤能够作为有效的增益介质来实现短腔型单频光纤激光器。同时,通过进一步的系统集成,基于稀土掺杂石英光纤的单频光纤激光器将得到更加广泛的应用。     

L-band multiwavelength fiber laser using an elliptical fiber

In this letter, we propose and demonstrate a simple and novel technique to get multiwavelength operation in the L-band by using an elliptical core erbium-doped fiber. The principle of operation is based on the anisotropic gain effect in a polarization-maintaining fiber. Stable multiwavelength operation is achieved at room temperatures. The lasing lines may be controlled by a polarization controller     

Novel fiber sensor arrays using erbium-doped fiber amplifiers

We examine the signal-to-noise ratio (SNR) performance of a novel type of time domain multiplexed sensor arrays in which low gain (1-10 dB) fiber amplifiers are incorporated to compensate for splitting losses between sensors. The system noise figure for passive and amplified sensor arrays is presented, along with expressions to optimize the array parameters for high SNRs. We show that practical amplified sensor arrays exhibit low system noise figures that allow much larger arrays (hundreds of sensors) than passive arrays     

Single-mode hole-assisted fiber as a bending-loss insensitive fiber

We investigate the design and characteristics of a single-mode and low bending loss HAF both numerically and experimentally. An air filling fraction S is introduced to enable us to design a HAF with desired characteristics more easily. We show that we can expect to realize a single-mode and low bending loss HAF by considering the S dependence of the bending loss α_b and cutoff wavelength λ_c as well as their relative index difference Δ dependence. We also show that the mode-field diameter (MFD) and chromatic dispersion characteristics of the single-mode and low bending loss HAF can be tailored by optimizing the distance between the core and the air holes. We also investigate the usefulness of the fabricated HAFs taking the directly modulated transmission and multipath interference (MPI) characteristics into consideration. We show that the designed HAF has sufficient applicability to both analog and digital transmission systems. Our results reveal that the single-mode and low bending loss HAF is beneficial in terms of developing a future fiber to the home (FTTH) network as well as for realizing flexible optical wiring.     

气压式光缆系统

气压式光缆系统是解决光纤接入最用户的方案之一,本文介绍了构成该系统的传送理论及主要部件的结构,并对其机械特性、压送特性、传输特性等进行了比较全面的分析与评估。     

光子晶体光纤在光纤激光器中的应用

光子晶体光纤研究的日趋成熟不仅拓宽了光纤激光器的研究领域,同时也推动了激光技术的发展.文章针对大模面积双包层光子晶体光纤的特点,探讨了其在光纤激光器中的应用,重点阐述了光子晶体光纤在光纤激光器应用领域的最新进展,并介绍了燕山大学在制备稀土掺杂光子晶体光纤上所取得的最新成果.     

Switchable and tunable multiwavelength erbium-doped fiber laser with fiber Bragg gratings and photonic crystal fiber

We propose and report on a novel multiwavelength-switchable-tunable erbium-doped fiber laser with excellent stability and uniformity based on four-wave mixing (FWM) in a highly nonlinear photonic crystal fiber. By adjusting the attenuators, the single, dual, or triple wavelengths can be lasing simultaneously. Under the influence of the FWM, the spectrum is stabilized and the uniformity is less than 0.6 dB.