此參考設計可實現并測量完整的120 mhz高帶寬光學前端;這種前端由高速跨阻放大器、全差動放大器和高速160位議員ADC（具有JESD204B接口）組成。設計中提供了相應的硬件和軟件，用于評估該系統對于隨附激光驅動器和二極管產生的高速光脈沖的響應性能，適合具有光時域反射（OTDR））的應用。

　　A high-speed laser driver pulses the laser diode that transmits an optical pulse through the fiber. The optical attenuator controls the strength of the optical pulse incident on the photo-diode without changing the operating point of the laser diode or its driver. A high-speed photodiode placed in close proximity to the transimpedance amplifier converts the optical energy into an output current. The transimpedance amplifier converts the current into a pseudo-differential output voltage. The subsequent fully differential amplifier （FDA） stage converts the signal to a fully differential signal and level-shifts the output commonmode to match the ADC. The FDA drives the ADC through a doubly terminated 50-? resistor.