Because beams radiate upon motion along the grating,the energy flow in the output channel drops with increasing channel number.In typical situations such as the one depicted in Fig.1(c),the energy losses are of the order of 25% of the input value even for outputs located at the 50th channel.
由于光束是沿着光栅的运动发光,在输出通道里的能流随着通道数量的增加而下降.犹如图示1（c）所描述的典型状况,能量损失是输入值的25%,甚至位于第50条通道的输出值也一样.
The energy radiation rate decreases with a decrease in the modulation period.Already at T= π/4 (which is of the same order as the soliton width) the soliton is barely affected by the periodic variation of the refractive index and thus propagates as in a uniform medium even for considerable depth of refractive-index modulation p =1 [Fig.1(a)].Figure 2(d) shows the dependence of the output channel on the period of the modulation at a fixed incident angle.Note the rapid growth of the radiation loss rate that is accompanied by a decrease in the number of the output channel.
随着调制周期的降低,能量的照射率也下降.折射指数的周期变化对已位于T= π/4（与光孤子宽度同顺序）的光孤子几乎没有影响,因此,甚至是在颇深的折射指数调制p=1【图示1(a)】,光孤子也犹如在一个均匀介质中传播.图示2(d) 显示的是输出通道在固定的入射角与调制周期的关系.注意随着输出通道数量的减少而快速扩大的照射损失率.
The output channel number decreases with increasing guiding parameter.Such behavior,which supports the central idea of tunable discreteness put forward here,is illustrated in Fig.3.Figures 3(a) and 3(b) demonstrate the possibility of controlling the soliton mobility by varying the refractive-index modulation depth,i.e.,the effective discreteness of the lattice.
增加引导参数可减少输出通道数量.图示3 阐明了这种特性,它支持在此提出的可调谐离散性的中心思想.图示3 (a) 和3 (b) 表明,通过改变折射指数调制深度,既是对晶格的有效离散,有可能控制光孤子的迁移率.
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