匹配光纤光栅温度传感解调系统

实验了一种基于一维调节器的光纤光栅静态温度(温度缓变)探测系统。在系统中,一维调节器与步进电机相连,步进电机由PC(计算机)通过PLC(可编程逻辑控制器)进行控制,匹配光纤光栅被固定在一维调节器上用来解调增敏光纤光栅传感器探测到的温度信号,匹配光栅的Bragg周期可通过调节一维调节器进行控制,其透射的光信号经光电检测电路检测并与调节架形成闭环控制。实验测得,在10℃~70℃范围内系统温度传感探测精度为±0.3℃。     

一种光CDMA频域的二次方一致性码

在二次方一致性的基础上,构造了一种容量大、自相关和互相关特性好的码族研究表明,采用这个码族的光码分多址(OpticalCDMA)系统比波分复用(WDM)系统拥有大得多的用户数而且这个码族很适合于异步和多比特率接入的光码分多址系统据我们了解,这种码字用于在光码分多址非相干频域编制中为首次被提出.     

16×10Gb/s啁啾光纤光栅色散补偿系统性能研究

运用啁啾光纤光栅法对在G.652光纤传输的16×10 Gb/s信号实现色散补偿数值模拟和研究,分析了入纤光功率、色散斜率以及啁啾光纤光栅色散补偿带宽对系统误码率的影响,结论是:入纤光功率在8～16 dBm之间时系统的性能较好;啁啾光纤光栅的色散补偿带宽对系统的影响较大;光纤的色散斜率对系统误码率有一定的影响.     

介绍《导波光学物理基础》一书

近几十年来 ,由于激光器和光导纤维的发明 ,使传统的电信息处理逐渐让位于现代光信息处理 ,世界由电子时代迈向光子时代 .对应此巨大转变 ,光信息科学与技术这一崭新的学科专业也应运而生 ,并获得了很大发展 .作为光信息科学与技术领域的基础学科 ,导波光学 (包括集成光学和纤维光学两个分支 )的重要性不言而喻 .佘守宪教授编著的《导波光学物理基础》(北方交通大学出版社 ,2 0 0 2年 8月出版 )一书 ,是他从事“导波光学”教学和科研成果的总结 ,凝聚了他在集成光学、纤维光学等学科上 2 0余年的心血 .该书从经典电磁场理论和近代光学基础出…     

拉曼放大辅助波长可选择的全光开关

使用3-dB耦合器组成M-Z干涉仪,在M-Z干涉仪的一臂加入高非线性光纤(HNLF)组成的反向拉曼放大器,改变放大器的泵浦波长及强度,可实现波长可选择的全光开关。其功能可用于波分复用(WDM)系统,对不同波长的上、下载选择有很大的应用意义。理论分析了实现这一功能的可行性和参数选择,考虑拉曼放大并伴有交叉相位调制(XPM)引起信号光的相移,推导分析了在引入放大的同时又引入相移,怎样选择放大和相位匹配问题,来实现波长可选择的光开关的要求。     

Investigation of the guided-mode characteristics of hollow-core photonic band-gap fibre with interstitial holes

This paper investigates the guided-mode characteristics of hollow-core photonic band-gap fibre (HC-PBGF) with interstitial holes fabricated by an improved twice stack-and-draw technique at visible wavelengths. Based on the simulation model with interstitial holes, the influence of glass interstitial apexes on photonic band-gaps is discussed. The existing forms of guided-mode in part band gaps are shown by using the full-vector plane-wave method. In the experiment, the observed transmission spectrum corresponds to the part band gaps obtained by simulation. The fundamental and second-order guided-modes with mixture of yellow and green light are observed through choosing appropriate fibre length and adjusting coupling device. The loss mechanism of guided-modes in HC-PBGF is also discussed.     

Ultra-violet and mid-infrared continuum generation by cross-phase modulation between red-shifted solitons and blue-shifted dispersive waves in a photonic crystal fiber

Using a photonic crystal fiber with a zero dispersion wavelength of the fundamental mode at 780 nm designed and fabricated in our lab, the ultraviolet and mid-infrared continua are generated by cross-phase modulation between red-shift solitons and blue-shift dispersive waves. The dependences of continuum on the pump power and wavelength are investigated. With the pump working at 820 nm, when the pump power increases from 300 to 500 mW, the bandwidths of ultraviolet and mid-infrared continua change from 80 to 140 nm and 100 to 200 nm, respectively. The wavelength of ultraviolet continuum is below 246 nm, and the wavelength of mid-infrared continuum exceeds 2500 nm. Moreover, the influences of pump power on wavelength and conversion efficiency of different parts of continua are also demonstrated.     

光子晶体光纤的研究新进展

介绍了国内外光子晶体光纤(PCF)研究的新进展,涉及到大负色散PCF研究、光子带隙型PCF的带隙与模式研究、利用PCF的波长可调节有效频率变换、基于PCF的可见光波段平坦超连续谱(SC)和高效宽带切伦科夫辐射(CR)的产生等,并介绍了近期在PCF相关理论和实验方面研究进展,包括PCF的数值分析新方法,极大负色散的PCF...     

Investigation of the influence of the key parameters onthe system performance in all-ptical label switching based on FSK/ASK orthogonal modulation format

<正>The transmission characteristics of the optical label switching system based on the FSK/ASK orthogonal modulation format is investigated.The factors that affect the transmission performance,such as the FSK tone space,dispersion compensation and coupler split ratio,are studied by numerical simulation.The proposed scheme is also experimentally demonstrated with a transmission of 155 Mbit/s FSK label combined with 10 Gbit/s ASK payload.