Frequency Comb Distillation for Optical Superchannel Transmission
Frequency Comb Distillation for Optical Superchannel Transmission
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DOI：
10.1109/jlt.2021.3116614
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发表时间：
2021-12-01
影响因子：
4.7
通讯作者：
Corcoran, Bill
中科院分区：
文献类型：
--
作者：
Prayoonyong, Chawaphon;Boes, Andreas;Corcoran, Bill
光频梳可以为每秒多太比特的光超级信道提供一种有效的光源。然而，随着这些多波长光源的带宽增加，其可导致低的每线功率。光放大器可以用来克服功率限制，但是伴随的自发光噪声会降低光学系统的性能。为了克服这一点，我们演示了宽带噪声降低梳状线使用高Q值的microwave谐振器，其谐振与梳状线对齐，同时提供多个梳状线的紧密光学滤波。通过以这种方式提取光频率梳，当这些线用于相干光通信系统时，我们能够降低所需的梳状线OSNR。通过对一个19.45 GHz的梳状线产生71条线，使用18 Gbaud，64-QAM子信道，频谱效率为10.6 B/s/Hz的性能测试，我们发现噪声污染的梳状线可以降低梳状线所需的光信噪比，当用作发射侧的光载波时，降低了约9 dB，并且当用作接收机侧的本地振荡器时接近12 dB。该演示提供了一种使低功率光频梳能够支持高带宽和高容量通信的方法。
Optical frequency combs can potentially provide an efficient light source for multi-terabit-per-second optical superchannels. However, as the bandwidth of these multi-wavelength light sources is increased, it can result in low per-line power. Optical amplifiers can be used to overcome power limitations, but the accompanying spontaneous optical noise can degrade performance in optical systems. To overcome this, we demonstrate wideband noise reduction for comb lines using a high-Q microring resonator whose resonances align with the comb lines, providing tight optical filtering of multiple combs lines at the same time. By distilling an optical frequency comb in this way, we are able to reduce the required comb line OSNR when these lines are used in a coherent optical communications system. Through performance tests on a 19.45-GHz-spaced comb generating 71 lines, using 18 Gbaud, 64-QAM sub-channels at a spectral efficiency of 10.6 b/s/Hz, we find that noise-corrupted comb lines can reduce the optical signal-to-noise ratio required for the comb by similar to 9 dB when used as optical carriers at the transmitter side, and by similar to 12 dB when used as a local oscillator at the receiver side. This demonstration provides a method to enable low power optical frequency combs to be able to support high bandwidth and high-capacity communications.