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Saturation current-bandwidth product (SCBP), the key of figure of merit in high-speed and high-power photodiodes (PDs), is mainly limited by the tradeoff between carrier drift time in depletion layer and RC-limited bandwidth of conventional PDs. Here, we present a revolutionary photodiode structure: linear-cascade photodiodes (LCPDs), designed to further improve the SCBP performance. Our demonstrated...
By combing high-modulation-depth (160%) photonic 124GHz MMW sources with NBUTC-PDs for remote (>;25km) generation, 6dB power enhancements and 14.4dBm saturation power are achieved as compared to NBUTC-PDs operated under sinusoidal excitation.
By using optimized shaped optical pulses, we demonstrate a factor-of-∼25 enhancement in the spectral power density of sub-THz wave at 93 GHz compared with that for quasi-sinusoidal optical modulation.
We demonstrate linear cascade near-ballistic uni-traveling-carrier photodiodes. Compared with control (a single device), this novel structure exhibits significant improvement in bandwidth-efficiency and saturation-current-bandwidth products. Record-high saturation-current-bandwidth product ( > 6825 mA-GHz, 91GHz) under 50Ω loads can be achieved.
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