随着大容量的单模光纤在通信网络中的广泛应用,人们期望有甚高速(>2Gb/s)光传输系统来满足通信容量增加的要求。光前端接收器是这些系统中的关键性元件,因为要求它同时具有宽带宽和低噪音,而这二者常常是矛盾的。超宽度带宽的接收器对于未来的外差通信系统尤为重要,因外差接收器通常要求的带宽是数据速率的数倍。业已报道过采用带有APD光电二极管的GaAs FET集成互阻抗型的低噪音接收器,其 With the widespread use of high-capacity single-mode optical fibers in communication networks, very high speed (> 2Gb / s) optical transmission systems are expected to meet the demands of increased communication capacity. Optical front-end receivers are a key element in these systems, as they are required to have both wide bandwidth and low noise, both of which are often contradictory. Ultra-wide bandwidth receivers are particularly important for future heterodyne communications systems because heterodyne receivers typically require several times the data rate. GaAs FET integrated transimpedance low noise receivers using APD photodiodes have been reported, which