Examination to eliminate undesirable phase delay of an avalanche photodiode (APD) for intensity‐modulated light
Examination to eliminate undesirable phase delay of an avalanche photodiode (APD) for intensity‐modulated light
复制标题
检查以消除强度调制光雪崩光电二极管 (APD) 的不良相位延迟
DOI：
10.1063/1.1146107
复制
发表时间：
1995
影响因子：
1.6
通讯作者：
N. Suzuki
中科院分区：
文献类型：
--
作者：
S. Yokoyama;A. Okamoto;T. Araki;N. Suzuki
当入射光的调制频率超过几百MHz时，雪崩光电二极管(雪崩光电二极管)中输入光和输出电流之间的不良相位延迟是显著的。延迟程度随着入射光强的减小而增大。为了阐明这一现象，研究了雪崩光电二极管的相位延迟、输出电流和倍增系数(电流增益)之间的关系。研究发现，随着入射光强的降低，雪崩光电二极管的倍增因子增大，导致雪崩光电二极管的截止频率降低。假设截止频率定义了信号延迟，则已经相对于乘法因子量化了相位延迟量。这样的相位延迟可以通过在调制光上叠加偏置光以使总强度保持恒定来消除。为了证实这一点，提出了一种采用强度调制激光二极管和非调制激光二极管(LD)的伺服控制系统。
Undesirable phase delay in avalanche photodiode (APD) between input light and output current is noticeable when modulation frequency of the incident light is over several hundreds of MHz. The degree of the delay increases with a decrease of the incident intensity. To clarify this phenomenon, relationships among the phase delay, output current, and the multiplication factor (current gain) of APD have been investigated. From this investigation, we found that the multiplication factor of APD increased with a decrease of the incident intensity, resulting in a decrease of the cutoff frequency of the APD. Supposing that the cutoff frequency defines the signal delay, the amount of the phase delay has been quantified with respect to the multiplication factor. Such a phase delay can be eliminated by superimposing a bias light on the modulation light so that the total intensity remains constant. To confirm this, a servo control system using an intensity modulated laser diode and unmodulated laser diodes (LDs) was c...