针对行波光电探测器阵列仅提高了光电探测器的输出功率而输出带宽未得到改善的特点, 提出了一种由光电二极管组构成的高性能行波光电探测器阵列新结构.即把两个光电二极管级联后再将两个级联支路并联, 然后在光电二极管组上串联电容构成单个阵列单元, 再按照阵列式结构将这些阵列单元用电感连接起来构成新型行波光电探测器阵列.对比分析了行波光电探测器阵列新旧结构的功率合成、频率响应和回波损耗特性.在应用同等数量二极管的条件下, 新型行波光电探测器阵列输出功率减少了一半, 但工作带宽提高了一倍.此外, 回波损耗随着阵列中应用二极管数目的增加相对于原阵列而言改善得更加明显.研究结果表明, 本文提出的行波光电探测器阵列新结构能够在增加输出功率的同时提高工作带宽, 更好地满足未来光载无线通信对光电探测器高功率宽带宽的需求.

Traveling-wave photodiode arrays can combine the output power of the diodes without increasing the bandwidth. To deal with such problem, a kind of high-performance diode groups traveling-wave photodiode arrays structure was proposed. Firstly, two-element near-ballistic uni-traveling-carrier photodiodes were cascaded, and then parallel these two cascaded branches. After that, we have a capacitor in series on these diode groups to form array units. Then these array units were cascaded and connected with inductors based on traveling-wave detector arrays to constitute new traveling-wave photodiode arrays. The power synthesis, frequency response and return loss of traveling-wave photodiode arrays were analyzed and compared. Under the condition of applying the same amount of diode, the output power of the new traveling-wave photodiode arrays is halved and its cut-off frequency is doubled. In addition, compared to traditional structure, the return loss improves more obviously with the number of diodes in arrays increasing. The results show that this new traveling-wave photodiode arrays structure can increase the output power while improve the working bandwidth, better meet the requirements of high-power and high-bandwidth photodetector in future radio-over-fiber wireless communication.