An improved background extinction was researched and proposed.
2.研究并提出了一种改进型背景消减法。
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The results also show that the performance of this communication system can be affected by background optical, APD gain and modulation extinction ratio.
该通信系统还受背景光、雪崩光电二极管（APD）增益和调制消光比等因素的影响。
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