Digital broadband linearization of optical links.
Digital broadband linearization of optical links.
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DOI：
10.1364/ol.38.000446
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发表时间：
2013-02
期刊：
影响因子：
3.6
通讯作者：
D. Lam;A. Fard;B. Buckley;B. Jalali
中科院分区：
文献类型：
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作者：
D. Lam;A. Fard;B. Buckley;B. Jalali
我们提出了一种数字后处理线性化技术，以有效地抑制动态失真添加到模拟光链路中的宽带信号。我们的技术实现了高达35 dB的抑制互调失真超过多个倍频程的信号带宽。与传统的线性化方法相比，它不需要过多的模拟带宽来执行数字校正。这是通过从捕获的输出中再生不希望的失真，并从失真的数字化信号中减去它来实现的。此外，我们实验证明了一个记录的无杂散动态范围为120 dB·Hz（2/3）超过6 GHz的电信号带宽。虽然我们的数字宽带线性化技术的进步国家的最先进的光链路，它也可以应用于其他非线性动态系统。
We present a digital postprocessing linearization technique to efficiently suppress dynamic distortions added to a wideband signal in an analog optical link. Our technique achieves up to 35 dB suppression of intermodulation distortions over multiple octaves of signal bandwidth. In contrast to conventional linearization methods, it does not require excessive analog bandwidth for performing digital correction. This is made possible by regenerating undesired distortions from the captured output, and subtracting it from the distorted digitized signal. Moreover, we experimentally demonstrate a record spurious-free dynamic range of 120 dB·Hz(2/3) over a 6 GHz electrical signal bandwidth. While our digital broadband linearization technique advances state-of-the-art optical links, it can also be applied to other nonlinear dynamic systems.