并且拉曼散射光谱向低波数方向移动，有助于增加光致电子的跃迁几率，提高多相光催化过程的本征量子效率。

The Raman scattering shifted to low wave number direction helped to increase the transition probability of photon-generated electrons and improved photoefficiency.

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一定的传输距离和发射光功率情况下，不同的子载波数存在一个最佳的光调制指数，使得系统载噪比最大；

Under a certain deliver distance and the light power, the different sub-carries number to exist a best optical modulation index, making the system's carrier-to-noise ratio biggest.

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