关于光检测器,下列说法正确的是: With regard to photodetectors, the following statements are correct:
A.
PIN光电二极管,I层掺杂浓度较高,吸收效率明显。 PIN photodiode, i-layer doping concentration is high, absorption efficiency is obvious.
B.
PIN光电二极管I层中光生电子空穴对漂移分量占主要地位。 The drift component of the photogenerated electron hole pair in the i layer of PIN photodiode is the main component.
C.
APD雪崩光电二极管只放大信号光并不放大噪声。 APD avalanche photodiodes only amplify signal light but not noise.
D.
采用升压型开关倍压电路可以提供较高电压来驱动APD,但效率较低。 Using boost switching voltage multiplier circuit can provide higher voltage to drive APD, but the efficiency is low.