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Highly Tunable Heterodyne Sub-THz Wireless Link Entirely Based on Optoelectronics
IEEE Transactions on Terahertz Science and Technology ( IF 3.2 ) Pub Date : 2021-03-08 , DOI: 10.1109/tthz.2021.3064188
Alvaro Morales , Gleb Nazarikov , Simon Rommel , Chigo Okonkwo , Idelfonso Tafur Monroy

This article presents the experimental demonstration of a fully photonics-based heterodyne subterahertz (sub-THz) system for wireless communications. A p-i-n photodiode is used as a broadband transmitter to upconvert the signal to the sub-THz domain and a photoconductive antenna downconverts the received wave to an intermediate frequency around 3.7 GHz. The optical signals used for photomixing are extracted from two independent optical frequency combs with different repetition rates. The optical phase locking reduces the phase noise of the sub-THz signal, greatly improving the performance of the system when phase modulation formats are transmitted. The sub-THz carrier is tuned between 80 and 320 GHz in 40-GHz steps, showing a power variation of 21.8 dB. The phase noise at both ends of the communication link is analyzed and compared with the phase noise of the received signal with different wireless carriers. As a proof-of-concept, a 100-Mbit/s binary-phase-shift-keying signal is successfully transmitted over 80-, 120-, and 160-GHz carriers, achieving a bit error rate below 10 −5 in the first two cases. These results show the great potential of THz communications driven by photonics to cover an extensive portion of the THz range without relying on electronic components that limit the operating range of the system to a concrete frequency band.

中文翻译:

完全基于光电的高度可调外差次太赫兹无线链路

本文介绍了用于无线通信的完全基于光子学的外差太赫兹(sub-THz)系统的实验演示。pin光电二极管用作宽带发射器,将信号上变频至次THz域,而光电导天线将接收的波下变频至3.7 GHz左右的中频。从具有不同重复率的两个独立的光学频率梳中提取用于光混合的光学信号。光学锁相减少了亚太赫兹信号的相位噪声,大大提高了系统在传输相位调制格式时的性能。次THz载波以40 GHz的步幅在80和320 GHz之间进行调谐,显示出21.8 dB的功率变化。分析通信链路两端的相位噪声,并将其与具有不同无线载波的接收信号的相位噪声进行比较。作为概念验证,可以在80、120和160 GHz载波上成功发送100 Mbit / s二进制相移键控信号,实现低于10的误码率 在前两种情况下为-5。这些结果表明,由光子驱动的太赫兹通信具有巨大的潜力,可以覆盖太赫兹范围的很大一部分,而无需依靠将系统的工作范围限制在特定频段的电子组件。
更新日期:2021-05-04
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