求翻译：实验测得和数字模拟得到的 相移光栅的透射谱如图9.12所示。插入损耗就是以分贝表示的透射率。中心尖峰处于1549.94nm处，半峰值宽度为450MHz,。。是什么意思？

The experimental and digital simulation of the phase shift grating transmission spectrum shown in Figure 9.12. Transmission rate of the insertion loss is expressed in decibels. The center peak in the 1549.94nm at half peak width for the 450 megahertz. .

Experiments and numerical simulations are measured by the phase shift of the transmission spectrum grid as shown in Figure 9.12 . Insertion loss in decibels is the transmittance. Center peak is 549.94 NM, half-peak width of 450 MHz. .

The experiment obtains the phase-shift diffraction grating which obtains with the digital simulation to pass spectrum as shown in Figure 9.12.The insertion loss is by the decibel expression transmittance.The central peak is in 1549.94nm place, half peak value width is 450MHz.。

Experimental measurement and numerical simulation by phase shift gratings transmission spectrum as shown in Figure 9.12. Transmission rate of insertion loss is expressed in decibels. Center peak is in 1549.94nm, half-peak width of 450MHz, ...

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