Phase modulator and amplitude modulator are both indispensable optical modulator in quantum cryptographic communication.
相位调制器与振幅调制器是连续变量量子密钥分发中不可缺少的光调制器件。
The principle of MQAM modulation and demodulation was outlined,and variable rate QAM,which could improve the spectral efficiency distinctly,was introduced in detail,its particular application in EDSL System was also discussed in this paper.
概述多电平正交振幅调制(MQAM)调制解调的一般原理,介绍一种能有效提高频谱利用率的变速率调制技术,并论述它在EDSL系统中的具体应用。