对给定调制参数的余弦-高斯光束，通过适当选取分数傅里叶变化阶数可以获得平顶的光强分布。
A flat-topped beam can be achieved by a suitable choice of the transform order for the Cosine-Gaussian beams with the modulation parameter.
采用分布反馈式半导体激光器作为光源，通过光源调制实现气体体积分数的谐波检测，显著提高了检测的灵敏度。
Using DFB LD as light source, the detection sensitivity has been greatly improved by light source modulation harmonic measurement.
进行了FSK, MSK和GMSK调制解调的算法的研究，并在此基础上总结了部分数字信号调制的通用的算法。
It also studies the algorithms of FSK, MSK, GMSK modulation and demodulation mode, and summarizes the general the software modulation and demodulation algorithm.
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