AI 中文总结
研究针对自由空间光通信受大气湍流影响易中断的问题，通过改进的偏振复用相干光收发器，利用波长分集传输信号，并经最大比合并处理，降低了中断概率，还利用波长相关性进一步降低中断概率。
AI 中文摘要
自由空间光通信（FSOC）链路易受大气湍流引起的衰落导致的中断影响。波长分集可通过在基本不相关的信道上传输相关信息来减轻衰落。在本研究中，我们展示了一个波长分集系统，以减轻湍流对在自由空间中传播的信号的影响。一个改进的偏振复用相干光收发器在具有湍流模拟器的台式自由空间链路上，以200 Gbps的客户速率在C波段内的两个载波频率上传输56.8 GBaud的信号。两个同步的单波长相干接收器捕获每个载波频率上的接收波形，随后使用最大比合并进行数字组合以进行离线处理。我们的结果表明，与单载波传输场景相比，中断概率降低了近20倍。最后，我们观察到C波段中波长之间的衰落相关相关性，利用该相关性可将中断概率降低86%。
英文摘要
Free-space optical communication (FSOC) links are susceptible to outages caused by atmospheric turbulence-induced fading. Wavelength diversity can mitigate fading by transmitting correlated information across substantially uncorrelated channels. In this study, we demonstrate a wavelength diversity system to mitigate the effects of turbulence on a signal propagated in free space. A modified polarization-multiplexed coherent optical transceiver transmits a 56.8 GBaud signal at a client rate of 200 Gbps across two carrier frequencies within the C-band over a bench-top free-space link with a turbulence emulator. Two synchronized single-wavelength coherent receivers capture the received waveforms at each carrier frequency, which are subsequently digitally combined using maximal ratio combining for offline processing. Our results demonstrate a reduction in outage probability by nearly a factor of 20 compared to the single carrier transmission scenario. Finally, we observe fading-dependent correlation between wavelengths in the C-band, which is exploited to reduce the outage probability by 86%.
CommentsRejected at Optics Express
