We demonstrate a technology to extend the bandwidth of optical transmitters based on optical time interleaving. An optical time-interleaving in-phase-and-quadrature (IQ) modulator (TI-IQM), which consists of a 1-to-2 optical selector followed by two IQMs, generates optical signals with a bandwidth of each side of the optical carrier that is up to twice that of the electronic sub-signals sent to the IQMs. The sub-signals are generated by a digital spectral weaver followed by digital-to-analog converters and tailored so that the targeted extended-bandwidth signal is obtained as the final optical output from the TI-IQM. We verified the concept in a transmission experiment with 150-GBaud 4, 8, and 16-level quadrature amplitude modulation. We successfully generated optical signals with a bandwidth of each side of optical carrier of around 76 GHz, which is almost twice that of the electronic sub-signals.

中文翻译：

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使用光时间交织调制器和数字谱织器扩展发射机带宽

我们演示了一种基于光时间交织来扩展光发射机带宽的技术。光学时间交织的同相和正交（IQ）调制器（TI-IQM）由一个1-to-2光学选择器和两个IQM组成，该光学信号产生光信号的带宽在光的每一侧最多是发送给IQM的电子子信号的两倍的载波。子信号由数字光谱编织器生成，然后由数模转换器生成并进行定制，以便获得目标扩展带宽信号作为TI-IQM的最终光输出。我们在150 GBaud，4、8和16级正交幅度调制的传输实验中验证了该概念。我们成功产生了光信号，其光载波两侧的带宽约为76 GHz，