A low noise GaAs hybrid front-end amplifier suitable for coherent optical links is described. The microwave characterisation and modelling of a low capacitance PIN photodiode is used in the design of a high impedance (integrating) receiver. A 5 GHz bandwidth, transimpedance gain of 430Ohm and an equivalent input noise current spectral density of 6 pA/VHz at the IF frequency of 1.2GHz is achieved.
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机译：描述了适用于相干光链路的低噪声GaAs混合前端放大器。低电容PIN光电二极管的微波表征和建模用于高阻抗（集成）接收器的设计中。在1.2GHz的IF频率下，实现了5 GHz带宽，430Ohm的跨阻增益和6 pA / VHz的等效输入噪声电流频谱密度。
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