The feasibility of using InGaN/GaN multiple-quantum-well light-emitting diode arrays (LED arrays) as photodiodes (PDs) is investigated experimentally in addition to their light emitting function. Two discrete LED arrays are produced from one 4 × 4 LED array with a parallel-connected pixel configuration. Such compact designs are useful for light emission or detection at the transmitting/receiving terminals of optical wireless communication systems. Despite 4 × 2 LED arrays achieving a light output power of 67.4 mW at 250 mA, they exhibit an optical responsivity (detectivity) of 0.183 A/W (1.61 × 10 ¹² cm Hz ^1/2 W ⁻¹ ) under ultraviolet light illumination (λ = 380 nm) at zero bias. For 4 × 2 LED arrays, the presence of an appreciable ultraviolet light response, together with a high 3-dB bandwidth (∼8 MHz) for modulated light detection, allowed us to build a 15 Mbit/s directed optical link with these LEDs functioning as both the optical transmitter and the receiver. Finally, the unitary LED array-based optical link is capable of real-time transmission of digital audio signals (data rate = 6 Mbit/s) at a propagation distance of 100 cm in free space even though some of the constituent pixels are inactive for light detection.

中文翻译：

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双功能InGaN LED阵列的制造和表征，作为光无线通信的光发送器和接收器

除了其发光功能外，还对使用InGaN / GaN多量子阱发光二极管阵列（LED阵列）作为光电二极管（PD）的可行性进行了研究。由一个具有并联像素配置的4×4 LED阵列产生两个离散的LED阵列。这种紧凑的设计对于光无线通信系统的发送/接收终端处的发光或检测是有用的。尽管4×2 LED阵列在250 mA时达到67.4 mW的光输出功率，但它们仍显示出0.183 A / W（1.61×10 ¹² cm Hz ^1/2 W ^-1 ）在零偏置的紫外光照射下（λ= 380 nm）。对于4×2 LED阵列，存在明显的紫外光响应，以及用于调制光检测的3 dB高带宽（〜8 MHz），使我们能够建立15 Mbit / s定向光链路，使这些LED正常工作作为光发射器和接收器。最后，即使某些组成像素对于非激活状态而言，基于单一LED阵列的光链路仍能够在自由空间中以100厘米的传播距离实时传输数字音频信号（数据速率= 6 Mbit / s）。光检测。