We report on photo-detectors consisting of an optical waveguide that incorporates a resonant tunneling diode (RTD). Operating at wavelengths around 1.55 μm in the optical communications C band we achieve maximum sensitivities of around 0.29 A/W which is dependent on the bias voltage. This is due to the nature of RTD nonlinear current-voltage characteristic that has a negative differential resistance (NDR) region. The resonant tunneling diode photo-detector (RTD-PD) can be operated in either non-oscillating or oscillating regimes depending on the bias voltage quiescent point. The oscillating regime is apparent when the RTD-PD is biased in the NDR region giving rise to electrical gain and microwave self-sustained oscillations Taking advantage of the RTD's NDR distinctive characteristics, we demonstrate efficient detection of gigahertz (GHz) modulated optical carriers and optical control of a RTD GHz oscillator. RTD-PD based devices can have applications in generation and optical control of GHz low-phase noise oscillators, clock recovery systems, and fiber optic enabled radio frequency communication systems.
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机译：我们报告的光电探测器由一个包含谐振隧道二极管（RTD）的光波导组成。在光通信C波段中以大约1.55μm的波长工作，我们实现了大约0.29 A / W的最大灵敏度，这取决于偏置电压。这是由于具有负差分电阻（NDR）区域的RTD非线性电流-电压特性的性质。谐振隧穿二极管光电探测器（RTD-PD）可以根据偏置电压静态点在非振荡或振荡状态下工作。当RTD-PD在NDR区域偏置时会产生明显的振荡状态，从而产生电增益和微波自持振荡。利用RTD的NDR独特特性，我们证明了对千兆赫（GHz）调制光载波和光的有效检测RTD GHz振荡器的控制。基于RTD-PD的设备可以在GHz低相位噪声振荡器，时钟恢复系统和启用了光纤的射频通信系统的生成和光学控制中应用。
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