Digital optical signal amplifier using an Er-doped fiber optical bistable device

The principle and charecteristics of verious digital optical signal amplifiers using Er-doped fiber optical bistability devices have been discussed. Optical signal gain and its variation with the parameters of the devices with constant or pulse optical bias have been calculated, and the design principle of those devices has been given. Supported by the National Natural Science Fundation of China Zhang Yuancheng: born in Aug. 1938, Professor     

E r 3+ -doped fiber optical bistability by Ar+-laser

Under The nonlinear optics condition the all-fiber optical bistability operation has been realized in an all-fiber resonator consisted of Er-doped fiber and optical fiber couplers. The experimental bistability threshold is consistent with the theory. Supported by National Natural Science Foundation of China Song Qian: born in Aug. 1937. associate professor     

Optical fiber grating bistability

It is proposed that a segment of Er-doped fiber with a couple of fiber gratings on the ends may be used as a novel optical bistability device with low power and high speed. Operation and bistability threshold of device are analysed in accordance with the distributed feedback couple-mode theory and the nonlinear characteristic of Er-doped fiber. It is shown that a nanoseconds microwatts bistable operation of a centimeter device is realizable under nowaday technological condition. Supported by the National Natural Science Foundation of China Zhang Yuancheng: born in Aug. 1938. Professor     

1.55 μm wavelength operation of E r 3+ -doped optical fiber bistability

An all-optical all-fiber optical bistability operation has been realized in an all-fiber cavity consisted with Er-doped fiber and optical fiber-loop miroors. The experimental bistability threshold is consistent with the theory. Foundation item: Supported by the National Natural Science Foundation of China (69487007) Biography: Song Qian (1937-), female, Professor. Research direction: nonlinear optics and all-optical communication.     

窄线宽单频线偏振掺铒光纤环形腔激光器

报道了利用在未泵浦掺铒光纤中,驻波饱和吸收诱发的自写入光纤光栅的窄带滤波特性及反射波长自适应特性,并通过在腔中置入光纤起偏器,使掺铒光纤环形腔激光器产生单频线偏振激光输出,其线宽在0.75KHz以下,输出光具有典型的光学双稳态特征.     

Optical switching and digital signal amplification using an optical fiber grating OBD

It is proposed that an optical fiber grating bistability device may be used for an all-optical switching or an all-optical digital signal amplifier with low power and high speed. The principle, characteristic and parameter are analysed, and some design ideas are given. Supported by National Natural Science Foundation of China Song Qian: born in Aug. 1937, Professor     

掺Er~（3＋）光纤的光学双稳与多稳的相干控制

本文研究掺Er3＋光纤系统中的光学双稳和多稳,定性分析了双稳态的形成机理.通过理论衍生公式对系统特性进行拟合,在改变相干场的拉比频率和耦合方式的情况下,对系统的双稳与多稳能进行有效的控制.     

Absorptive nonlinearity in Er-doped optical fiber

Optical absorptive nonlinearity in Er-doped optical fiber has been discussed and measured at the window wavelength 1.55 μm for optical communications firstly. It is proposed that the mechanism of this absorptive nonlinearity is the induced absorption. The first order nonlinear absorptive coefficient and the imaginary part and the complex value of the third-order susceptibility at that wavelength are obtained from the measured absorptive nonlinearity. Foundation item: Supported by the National Natural Science Foundation of China (69487007) Biography: Song Qian (1937-), female, Professor. Research direction: nonlinear optics and all-optical communications.     

有机聚合物全光开关的实验研究

报道了两种非线性有机聚合物（非醚ＰＰＱ和Ｐｏｌｙ－３ＢＣＭＵ）波导全光开关的实验研究。应用前向简并四波混频原理在ＰＰＱ薄膜光波导中演示了全光开关功能。利用Ｐｏｌｙ－３ＢＣＭＵ的光漂白性质，设计并制备了能与光纤系统兼容的波导光开关实验器件。     

非线性光学效应在光纤通信中的应用研究

为了研究非线性光学效应在光纤通信中的应用,首先阐述了非线性光学的定义,探讨了非线性光学在光纤通信方面的应用发展．指出其研究展望．着重数值模拟了非线性光学效应在光纤通信中用作光纤拉曼放大器时的物理过程．结果表明：基于Chraplyvy模型能够较好地模拟出受激拉曼散射作为光纤拉曼放大器原理的过程．并且其程序运行效率高于采用洛仑兹模型．结论与文献相比有新的进展,为非线性光学的进一步理论、实验和应用研究提供了参考．     

Dispersive nonlinearity in Er-doped optical fiber

Optical dispersive nonlinearities in Er-doped optical fiber are discussed and measured at the third window wavelength 1.55 μm for optical communications firstly. The experimental method, which is developed by us, is based on dynamic scanning for fixed-point-interference (DSFPI) of two fiber beams. The real part and complex value of the third-order susceptibility at the wavelength are also obtained from the measured Kerr coefficient and nonlinear-absorption coefficient reported elsewhere. Foundation item: Supported by the National Natural Science Foundation of China(69487007) Biography: SONG Qian(1937-), female, Professor. Research direction: nonlinear optics and all-optical communications.     

具有光学双稳特性的连续波准三能级激光器的一般模型(英文)

简要报道由所建立的具有光学双稳特性的准三能级激光器的一个简单模型所导出的主要结果。该模型从理论上预言,在某些特定条件下激光运转的输入-输出关系可存在滞后回线。Yb掺杂的钒酸盐晶体激光振荡中所出现的光学双稳态行为的主要特征,都可由该模型得到解释。     

基于光子晶体光纤非线性环路镜光开关的研究

采用光子晶体光纤构成非线性光学环路镜,利用非线性环路镜中信号光与控制光之间交叉相位调制效应实现全光开关. 讨论了光子晶体光纤结构参数对其非线性的影响,建立了基于光子晶体光纤非线性环路镜光开关的理论模型,研究了光开关的透过特性及影响光开关性能的因素. 研究结果表明,基于光子晶体光纤非线性环路镜的光开关,可以在较短的环长和较低的开关功率下实现高速光开关操作,其开关特性可由控制光功率灵活调控. 光子晶体光纤非线性环路镜光开关为实现用于高速光通信系统中的光开关技术提供了一种重要思路.     

高速光纤通信测量技术的发展趋势

 光纤通信单信道速率持续向100 Gbit/s甚至更高发展,对测量仪器的带宽提出了更高的要求。由于电子瓶颈的限制,传统的电示波器极限带宽在70～90 GHz。目前能够测量100 Gbit/s光通信信号的电示波器技术难度和成本越来越高。为了突破电子瓶颈的限制,需要采用新的采样机理对超高速光通信信号或超宽带光信号进行测量。介绍了光域采样的基本原理和相应的光采样示波器及光采样示波器研发的进展。随着信道速率的不断提高,光纤链路的物理损伤对信号的影响越来越显著,如何监测光纤链路的物理损伤成为超高速光通信网需要解决的问题。基于对光物理层损伤的研究,提出了采用分数阶傅里叶变换测量光纤链路色散和非线性效应的方法,并对高速光纤通信链路的测量技术发展作了展望。     

光纤通信中非线性香农极限的突破——光频梳应用及发展趋势

 受限于光纤克尔非线性效应对传输信号质量的影响,光纤通信系统的传输速率和容量难以突破非线性香农极限的限制。利用光频梳的相干特性结合数字信号处理技术突破了早期非线性香农极限的传输性能,有望开启光频梳在下一代光纤通信领域研究的新时代。本文介绍光频梳的定义及产生机制、光频梳在信息通信系统中的最新典型应用、基于光频梳和通信信号处理技术在其他物理科学领域中的交叉应用,探讨了光频梳技术的未来发展方向。     

Hybrid fiber optical bistability and optical signal processing

A hybrid fiber optical bistable device with electrical feedback has been proposed and analyzed. Bistability operation and some applications for optical signal processing have been realized experimentally. Supported by the National Natural Science Fundation of China Song Qian: born in Aug. 1937, Professor     

光纤通讯系统中光弧子传输研究的新进展

综述了国外光纤通讯系统中光弧子传输研究的一些新进展,包括：１．光纤中Ｎ弧子相互作用;２．光纤中的光脉冲传播;３．在色散移位光纤中的飞秒经了－弧子相互作用;４．强耦合非线性参数弧波;５．光纤中有限带宽弧子传播的高阶效应;６．用非线性环形反射射对有限带宽弧子传播中的噪声积累进行抑制。     

基于NOLM中XPM效应的光脉冲压缩研究

提出了利用色散位移光纤(DSF)构成的非线性光纤环路镜(NOLM)中交叉相位调制(XPM)效应获得光脉冲压缩的新方法,并进行了相关分析.数值结果表明:在NOLM中,利用泵浦脉冲与其中一路信号脉冲共同传输时的交叉相位调制(XPM)效应,可使最终输出的信号脉冲获得较好的压缩.     

非线性Schrdinger 方程在光纤通讯中的应用(英文)

综述了非线性Ｓｃｈｒ¨ｏｄｉｎｇｅｒ 方程在光纤通讯系统中的一些应用，主要内容有：１） 光纤中Ｎ孤子相互作用；２） 光纤中的脉冲传播；３） 在色散移位光纤中的飞秒孤子孤子相互作用；４） 强耦合非线性参数孤波；５） 光纤中有限带宽孤子传播的高阶效应；６） 用非线性环形反射镜对有限带宽孤子传输中的噪声积累进行抑制。     

一种新的光纤数值孔径测量方法

光纤的数值孔径NA(numericalaperture)是光纤的一个重要光学参数,它在一定程度上表征光纤集光能力和与光源耦合的难易程度,同时对连接损耗及衰减特性也有影响.它与光纤传输系数的计量有密切的关系,对光纤的传输带宽有着很大的影响.光纤数值孔径的测量方法有多种,但所需的实验装置都比较复杂.本文提出了一种利用光纤传感实验仪实现光纤数值孔径测量的简单方法,该测量方法可靠易行.