School of Electrical and Computer Engineering, Purdue University, 465 Northwestern Avenue, West Lafayette, Indiana 47907, USA.
Opt Lett. 2010 Oct 1;35(19):3234-6. doi: 10.1364/OL.35.003234.
We demonstrate a scheme based on a cascade of lithium niobate intensity and phase modulators driven by specially tailored RF waveforms to generate an optical frequency comb with very high spectral flatness. In this Letter, we demonstrate a 10 GHz comb with 38 comb lines within a spectral power variation below 1 dB. The number of comb lines that can be generated is limited by the power handling capability of the phase modulator, and this can be scaled without compromising the spectral flatness. Furthermore, the spectral phase of the generated combs in our scheme is almost purely quadratic, which, as we will demonstrate, allows for high-quality pulse compression using only single-mode fiber.
我们展示了一种基于铌酸锂强度和相位调制器级联的方案，该方案由专门设计的射频波形驱动，可生成具有非常高光谱平坦度的光频梳。在本信中，我们演示了一个 10GHz 的梳状结构，在光谱功率变化低于 1dB 的情况下，有 38 个梳状线。可生成的梳状线数量受限于相位调制器的功率处理能力，而在不影响光谱平坦度的情况下，可以对其进行扩展。此外，我们方案中生成的梳状谱的相位几乎完全是二次的，正如我们将展示的，这允许仅使用单模光纤进行高质量的脉冲压缩。
