为了简化和改善光载无线通信系统, 提出了一种光探测器偏压调制技术, 利用PIN光探测器(PIN-PD)和单行载流子光探测器(UTC-PD)的输出光电流随偏压变化的特性进行调制.采用光探测器偏置调制技术, 光电探测和调制可以在一个光探测器上同时实现.研究表明当入射光功率为2.93 dBm 时, PIN-PD在10 GHz射频副载波上的调制带宽为800 MHz, UTC-PD在150 GHz射频副载波上的调制带宽为18.75 GHz.调制带宽随入射光功率的增大而增大, 当入射光功率为12.93 dBm时, UTC-PD在150 GHz射频副载波上的调制带宽可达25 GHz.调制深度与正弦偏压调制信号的最小值有关.

To simplify and improve Radio-over-Fiber (RoF) communication systems, a kind of modulation technology based on the variation of output photocurrent with bias of PIN photodiode (PIN-PD) and unitraveling-carrier-photodiode (UTC-PD) is proposed, which is called photodiode bias modulation. By using this modulation technology, both photodetection and optoelectronic modulation can be achieved simultaneously in one PD. Based on two analytical models, the modulation bandwidth of the PIN-PD is predicted as 800 MHz at a 10 GHz RF subcarrier, and the modulation bandwidth of the UTC-PD is predicted as 18.75 GHz at a 150 GHz RF subcarrier, when the incident optical power is both 2.93 dBm. The modulation bandwidth increases with the incident optical power, when the incident light power is 12.93 dBm, the modulation bandwidth of the UTC-PD can reach 25 GHz at a 150 GHz RF subcarrier. The modulation depth is associated with the minimum value of the sinusoidal bias modulation signal.