Shams Haymen, Fice Martyn J, Balakier Katarzyna, Renaud Cyril C, van Dijk Frédéric, Seeds Alwyn J
Opt Express. 2014 Sep 22;22(19):23465-72. doi: 10.1364/OE.22.023465.
We experimentally demonstrate photonic generation of a multichannel THz wireless signal at carrier frequency 200 GHz, with data rate up to 75 Gbps in QPSK modulation format, using an optical heterodyne technique and digital coherent detection. BER measurements were carried out for three subcarriers each modulated with 5 Gbaud QPSK or for two subcarriers modulated with 10 Gbaud QPSK, giving a total speed of 30 Gbps or 40 Gbps, respectively. The system evaluation was also performed with three subcarriers modulated with 12.5 Gbaud QPSK (75 Gbps total) without and with 40 km fibre transmission. The proposed system enhances the capacity of high-speed THz wireless transmission by using spectrally efficient modulated subcarriers spaced at the baud rate. This approach increases the overall transmission capacity and reduces the bandwidth requirement for electronic devices.
我们通过实验证明，利用光学外差技术和数字相干检测，在200 GHz载波频率下以QPSK调制格式光子产生多通道太赫兹无线信号，数据速率高达75 Gbps。对三个分别以5 Gbaud QPSK调制的子载波或两个以10 Gbaud QPSK调制的子载波进行了误码率测量，总速率分别为30 Gbps或40 Gbps。还对三个以12.5 Gbaud QPSK调制（总计75 Gbps）的子载波在无光纤传输和有40 km光纤传输的情况下进行了系统评估。所提出的系统通过使用波特率间隔的频谱高效调制子载波提高了高速太赫兹无线传输的容量。这种方法增加了整体传输容量并降低了电子设备的带宽要求。
