摘要
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。
The Modulator′s bias point setting is very important for optical fiber AM CATV externally modulated transmission. In this paper it is concluded that when the bias point drifts away from the best bias point, CSO (Composite Second Order distortion) is influenced severely, whereas CTB (Composite Triple Beat distortion) is not influenced. The related formulas were deduced for PAL/D 550 MHz CATV transmission, the maximum voltage deviation from the best bias point is less than 10 mV. The experimental results agree well with the theoretical analysis.
出处
《中国激光》
EI
CAS
CSCD
北大核心
1998年第10期905-908,共4页
Chinese Journal of Lasers
