Photonic-crystal nano-photodetector with ultrasmall capacitance for on-chip light-to-voltage conversion without an amplifier
Photonic-crystal nano-photodetector with ultrasmall capacitance for on-chip light-to-voltage conversion without an amplifier
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DOI：
10.1364/optica.3.000483
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发表时间：
2016-05-20
期刊：
影响因子：
10.4
通讯作者：
Notomi, Masaya
中科院分区：
文献类型：
--
作者：
Nozaki, Kengo;Matsuo, Shinji;Notomi, Masaya
传统光接收器的功耗主要由连接到光电检测器（PD）的电放大器的功耗决定。超低电容PD可以克服这一限制，因为当与高阻抗负载结合时，它可以在没有放大器的情况下产生足够大的电压。在这项工作中，我们展示了一个超紧凑的InGaAs PD的光子晶体波导的基础上，只有1.7 μ m的长度和小于1 fF的电容。尽管器件尺寸很小，但观察到1 A/W的高响应度和清晰的40 Gbit/s眼图，克服了尺寸和响应度之间的传统权衡。电阻加载的PD实际上被制造用于光-电压转换，并且即使没有放大器，也用电光探针测量了具有千兆赫带宽的千伏/瓦效率。结合实验和理论的结果表明，可以预期超过10 GHz的带宽，导致光接收器的能量消耗低于1 fJ/bit的超低。因此，具有有吸引力的性能水平的无放大器PD是可行的，并且是朝着芯片上密集集成的光子网络/处理器迈出的一步。(C)2016美国光学学会
The power consumption of a conventional photoreceiver is dominated by that of the electric amplifier connected to the photodetector (PD). An ultralow-capacitance PD can overcome this limitation, because it can generate sufficiently large voltage without an amplifier when combined with a high-impedance load. In this work, we demonstrate an ultracompact InGaAs PD based on a photonic crystal waveguide with a length of only 1.7 mu m and a capacitance of less than 1 fF. Despite the small size of the device, a high responsivity of 1 A/W and a clear 40 Gbit/s eye diagram are observed, overcoming the conventional trade-off between size and responsivity. A resistor-loaded PD was actually fabricated for light-to-voltage conversion, and a kilo-volt/watt efficiency with a gigahertz bandwidth even without amplifiers was measured with an electro-optic probe. Combined experimental and theoretical results reveal that a bandwidth in excess of 10 GHz can be expected, leading to an ultralow energy consumption of less than 1 fJ/bit for the photoreceiver. Amplifier-less PDs with attractive performance levels are therefore feasible and a step toward a densely integrated photonic network/processor on a chip. (C) 2016 Optical Society of America