We demonstrate a versatile technique to generate a broadband optical frequency comb source in the C-band. This is accomplished by nonlinear spectral broadening of a phase modulated comb source driven by dual frequency offset locked carriers. The locking is achieved by setting up a heterodyne optical frequency locked loop to lock two phase modulated electro-optic 25 GHz frequency combs sourced from individual seed carriers offset by 100 GHz, to within 6.7 MHz of each other. We realize spectral broadening in highly nonlinear fiber after suitable amplification to obtain an equalized, nonlinearly broadened frequency comb. We obtain $\sim 86 $∼86 lines in a 20 dB band spanning over 2 THz.

中文翻译：

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基于由双偏移锁定载波驱动的调相梳状光源的非线性频谱展宽的光学频率梳。

我们演示了一种通用技术来生成C波段的宽带光学频率梳源。这是通过由双频偏锁频载波驱动的调相梳状源的非线性频谱展宽来实现的。通过建立外差光频率锁定环来实现锁定，该环路将两个相位调制的电光25 GHz频率梳锁定在彼此之间的6.7 MHz之内，这些频率梳从偏移100 GHz的各个种子载波中获取。经过适当的放大以获得均衡，非线性展宽的频率梳，我们在高度非线性的光纤中实现了频谱展宽。我们获得跨越20 THz的20 dB频带中的\\ sim 86 $〜86线。