The basic principles and simulation methods of a null-coupler-based OADM are studied firstly, especially in the crosstalk of a Y-branch structure and the coupling properties of a tilted grating.
论文首先研究了零耦合器型OADM器件的基本原理与设计方法，特别是Y分支的串扰特性与斜光栅的耦合特性。
Carbon nanotubes (CNTs) grown directly on graphite substrate are fabricated firstly using electrodeposited iron particles by chemical vapor deposition. Most of CNTs have "y" junction structure.
首次以电沉积铁为催化剂，采用经典化学气相沉积技术在石墨基体上成功实现纳米碳管的直接生长，大部分纳米碳管具有“Y”形结构。
Firstly, we carry out vertical edge detection on the three components of Y, U and V because the vertical edges in the license plate area are very abundant.
该方法利用车牌区域竖直边缘异常丰富的特点，采用一种针对性很强的边缘提取算子，对Y，U和V三个颜色分量分别进行竖直边缘提取；
Firstly, the modified Y-W equation was used to estimate the parameters of the time-varied auto-regressive part and the error signal;
首先，采用改进的Y—W方程对TVARMA模型时变自回归部分系数进行估计，并计算残差序列；
Firstly, the modified Y-W equation was used to estimate the parameters of the time-varied auto-regressive part and the error signal;
首先，采用改进的Y—W方程对TVARMA模型时变自回归部分系数进行估计，并计算残差序列；
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