【摘 要】
：
The generation of coherent optical subcarriers based on a concatenated dual-drive Mach-Zehnder intensity modulator (IM) and two phase modulators (PMs) is proposed and experimentally demonstrated. The modulation index and DC bias of PM IM modulation are th
【出 处】
：
ChineseOpticsLetters
论文部分内容阅读
The generation of coherent optical subcarriers based on a concatenated dual-drive Mach-Zehnder intensity modulator (IM) and two phase modulators (PMs) is proposed and experimentally demonstrated. The modulation index and DC bias of PM IM modulation are theoretically investigated. Theoretical analysis and numerical study are also carried out to examine the proposed scheme. We use 25-GHz RF synchronous sinusoidal signals to drive cascaded two-stage PMs and IM, through which we generate 28 subcarriers with peak power fluctuations less than 4 dB. The measured tone-to-noise ratio of the subcarrier is higher than 40 dB. The experimental results show that for 100-Gb/s polarization multiplexing QPSK signal, the receiver sensitivity of the back-to-back signal is -28.6 dBm, and the power penalty is lower than 1 dB after 100-km transmission at the BER of 1 \times 10^{-9}.
其他文献
Effective medium theory is a powerful tool to solve various problems for achieving multifarious functionalities and applications. In this article, we present a concise empirical formula about effective permittivity of checkboard structures for different d
光刀，癌探针，微型焊接机及通讯网等是一些有希望的应用。
为了解不同类型气溶胶的消光特性及粒子多次散射效应对可见光传输性能的影响,选取400, 488, 550, 694 nm波长和海洋型、沙尘型、水溶性、烟尘4种常见气溶胶,基于Mie散射理论和建立的稳态蒙特卡罗计算模型,研究了可见光的大气传输衰减特性。结果表明,单个粒子散射强度随入射波长的增大而减小;海洋型、水溶性、烟尘粒子的消光效率因子随波长的增大而减小,沙尘型粒子则相反;海洋型、沙尘型、水溶性粒子的消光以散射为主,烟尘粒子则以吸收为主。利用稳态蒙特卡罗方法模拟多次散射效应,结果表明,光波在海洋型气溶胶中透
圆环达曼光栅(CDG)产生的贝塞尔光束照明可以扩展光学相干层析成像(OCT)系统的焦深,使得系统在较大成像深度范围均保持高的横向分辨率。但CDG一级衍射环的分裂效应会导致贝塞尔光束轴向能量分布出现凹陷,削弱了焦深扩展的效果。本研究团队在分析CDG衍射原理的基础上,优化设计了无一级衍射环分裂效应的CDG,并通过仿真证明了该CDG产生的贝塞尔光束不存在轴向能量凹陷,具有更好的焦深扩展效果;然后将优化设
Point pattern matching is an essential step in many image processing applications. This letter investigates the spectral approaches of point pattern matching, and presents a spectral feature matching algorithm based on kernel partial least squares (KPLS).
建立了用于测量钠原子光谱的无多普勒饱和荧光光谱测量系统。在该系统中使用了线宽约100 kHz的窄线宽染料激光器和光电二极管探测器。钠泡温度控制在65 ℃。两束相向传播的激光束在钠泡中重叠共同激发荧光。光电二极管被放置在钠泡的侧面接收、探测激发的荧光。LabVIEW软件控制的数据采集卡采集光电二极管的信号。通过扫描染料激光器的激光频率,可以观测到钠原子的无多普勒特征D2a,交叉共振以及D2b。当激光频率扫描的步长约为2 MHz时,在实验中观测到了D2a中的三条谱线。
We experimentally demonstrate multichannel wavelength multicasting for two nonreturn-to-zero quadrature phase-shift keying (NRZ-QPSK) channels based on four-wave mixing (FWM) in semiconductor optical amplifier (SOA). Through the interaction with the two p
本文提出用光谱加宽的方法,直接测定高功率激光系统的“B积分”。并对一个由九级放大器组成的Nd玻璃高功率激光行波放大系统进行了实际测量,获得较为满意的结果。
针对光栅横向剪切干涉仪研究了旋转绝对检测的方法，并用前36项Zernike多项式标定出剪切装置的系统误差非对称项。研究结果表明，将面形检测的绝对算法应用于检测镜头系统波像差，在干涉仪系统误差消除后可以达到相对理想的检测精度。实验数据的重复性的均方根可以达到0.14 nm。
针对基于原始点对特征的三维目标识别算法中存在的内存浪费、效率不高的问题,提出了一种基于增强型点对特征的三维目标识别算法。通过在原始点对特征的第4个分量上乘以一个符号函数,得到了一种区分性更强的点对特征,消除了原始点对特征存在的二义性。考虑到待识别目标三维模型存在的自遮挡,利用点对之间的视点可见性约束,剔除了目标三维模型哈希表中存在的大量冗余点对,节省了内存开销并提高了三维目标识别算法的识别准确率和