Photonic frequency converter for spectrally agile seamless access network in millimeter-wave band

研究了利用新制作的光相位调制器实现单波长和双波长调制的光子下转换技术。对系统特性进行了比较，并在43 GHz和52 GHz频段传输了高阶正交幅度调制(QAM)正交频分复用(Ofdm)信号。我们还演示了第一个无线电-光纤-无线电-光纤系统，用于使用光子下转换在上行链路方向上透明地传输100 GHz无线电信号。在100 GHz频段内，成功地传输了线速分别为30 Gb/S和40 Gb/Gb的16-QAM单载波和正交频分复用信号。提出并研制了一种集成电光频域均衡器的低损耗、高带宽的铌酸锂调制器。制作的钛扩散铌酸锂调制器的光学损耗为5.4dB，半波电压为3.7V，带宽超过110 GHz。

We studied photonic downconversion technology using single and dual wavelength modulation by a newly fabricated optical phase modulator. We compared the system characteristics and transmitted high-order quadrature amplitude modulation (QAM) orthogonal frequency-division multiplexing (OFDM) signals in the 43 and 52 GHz bands over the system. We also demonstrated the first radio-fiber-radio-fiber system for transparent delivery of 100-GHz radio signals in the uplink direction using photonic down-conversion. We successfully transmitted 16-QAM single-carrier and OFDM signals with line rates of 30 and 40 Gb/s over the system in the 100-GHz band. We proposed and developed a low-loss and high-bandwidth lithium niobate modulator integrated with an electro-optic frequency-domain equalizer. The fabricated Ti-diffused lithium niobate modulator has a low optical loss of 5.4 dB, low half-wave voltage of 3.7 V, and high bandwidth exceeding 110 GHz.