Different types of LCSLM have different modulation characteristics, in particular their phase modulation characteristic, so this must be measured before it is used.
但由于不同型号的液晶空间光调制器的调制特性，尤其是位相调制特性存在较大的差异，故在实际使用前均需加以测量后才能应用。
Aiming at the spectrum spread problem of traditional digital modulation signals, a time-phase modulation (TPM) method with abrupt phase change characteristic is proposed.
针对传统数字调制信号频谱扩展问题，提出具有相位突变特性的时相调制(TPM)方式。
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