增加激光光源谱宽和减少信号带宽可以有效地提高载噪比。
Increasing spectrum linewidths of laser sources and reducing bandwidths of signals can enhance CNR effectively.
光拍频干扰噪声大大地降低了单信道的载噪比，严重地劣化了系统的性能，因而必须加以抑制。
OBI noise drastically reduces CNR of each channel and seriously degrades the system performance, therefore must be suppressed.
为了提高收视质量，对系统设计中的载噪比和复合三次差拍（CTB）指标必然提出更高的要求。
As a result, it would carse more serious noiSe and distortion, In order to improve the reception quality, we are asked to make better design of a carrier for its noise ratio and CTB target.
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.
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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