论文部分内容阅读
对于光纤ＡＭＣＡＴＶ外调制传输，调制器的偏置工作点设置是非常重要的。通过理论分析得出：当工作点偏离最佳偏置点时，主要对系统的组合二次失真ＣＳＯ（ＣｏｍｐｏｓｉｔｅＳｅｃｏｎｄＯｒｄｅｒｄｉｓ－ｔｏｒｔｉｏｎ）产生影响，并导出相应的公式。对于ＰＡＬ／Ｄ制５５０ＭＨｚＣＡＴＶ系统，要保证ＣＳＯ小于－７０ｄＢｃ，工作点的偏移不能大于１０ｍＶ；实验结果和理论分析一致。
For fiber AMCATV external modulation transmission, the modulator bias operating point setting is very important. The theoretical analysis shows that when the working point deviates from the optimal bias point, it mainly affects the system Composite Composed Second Displacement (CSO) and derives the corresponding formula. For the 550MHz CATV system of PAL / D, ensure that the CSO is less than -70dBc and the offset of the operating point can not be greater than 10mV. The experimental results are consistent with the theoretical analysis.