【作者】 林国栋；

【导师】 刘岚岚；

【作者基本信息】 北京交通大学 ， 光学工程， 2009， 硕士

【摘要】 近年来光纤放大器向大功率、大增益带宽以及低噪声方向发展,以满足密集波分复用系统、光纤CATV系统和空间光通信系统的应用。超大功率、超宽带和参数优化越来越成为光纤放大器追求的目标和国内外关注的焦点。本文根据双包层光纤的结构特点,采用包层泵浦耦合技术,对1550nm的大功率光纤放大器进行了理论和实验的研究。本文首先从理论上对铒镱共掺双包层光纤放大器进行了设计和优化。采用Runge-Kutta法求解放大器的速率与功率传输方程,数值分析了在975nm泵浦下,双包层光纤放大器的输出信号功率、增益,讨论了它们随激活光纤长度、输入泵浦功率以及输入信号光功率的关系。实验测量了放大器的主要性能指标。当泵浦光波长975nm,泵浦总功率为10W时,对λ=1550nm的信号光,在Ps=0dBm时,该放大器的输出功率可达400mW,小信号增益在26dB以上。随着光纤通信技术的飞速发展,光纤测试设备也同步发展起来,对于传输光的监测与测量显得尤为重要。光探测器正是诸多急待开发的光纤系统测量仪器中的常用的、重要的基础设备。本文对市场上各种常见的光探测器进行了分类介绍,着重分析了热释电光探测器的工作原理,设计了高功率光纤夹持头,并对一种常见的大功率热释电光探测器进行了实验研究,对它的工作性能进行了评定和比较。更多还原

【Abstract】 Fiber amplifiers with high-power, wide-gain band and low-noise figure are required for applications to DWDM systems, fiber CATV system and space optical communication system. Ultrahigh-power, ultra-wide band and optimal parameters are becoming the goals the fiber amplifier pursues for and the focus both at home and abroad. Based on the characteristics of double-cladding fiber’s configuration, the amplifier with high-power output at 1550 nm is studied in this dissertation by using the cladding-pumped coupling technique.In this dissertation, the double cladding Er³⁺-Yb³⁺ co-doped fiber amplifiers is designed and optimized through theoretical analysis at first. Using the Runge-Kutta method to solve the rate and power propagation equations of amplifiers, the output signal power, gain and noise characteristics of double cladding Er³⁺-Yb³⁺ co-doped fiber amplifiers pumped at 975nm are investigated numerically. Their varyings as functions of the active fiber length, input pump power and input signal power are described.The experiment measured the major functional parameters of the amplifier. When the pumping wavelength was 975nm and the total pumping power was 10W, the output power of the amplifier at 1550nm reached 400mW with Ps=0dBm and the small-signal gain was more than 26dB.With the development of fiber communication technology, fiber measure equipment is also in progress, which is obviously important to the measurement of transferring laser. Optical detectors are important fundamental equipments in many fiber system measure instruments that need empolder urgently.In this dissertation, all kinds of familiar optical detectors on the market are introduced classifiedly. The principle of the pyroelectricity optical detector is analyzed emphatically. A high-power fiber-chucking device is designed. A kind of high-power pyroelectricity optical detector is studied through experimentation, and its characteristic is assessed and compared.更多还原