Departamento de Tecnología Electrónica, Universidad Carlos III de Madrid, Madrid, Spain.
Opt Lett. 2012 Sep 1;37(17):3657-9. doi: 10.1364/OL.37.003657.
We report the generation of a 95 GHz carrier frequency by optical heterodyning of two wavelengths from adjacent channels from an arrayed waveguide grating-based multiwavelength laser. The extended cavity structure of the device provides low phase noise and narrow optical linewidth, further enhanced by the intracavity filter effect of the arrayed waveguide grating. We demonstrate that the generated RF beat note, at 95 GHz, has a -3 dB linewidth of 250 kHz. To the best of our knowledge, this is the narrowest RF linewidth generated from a free-running dual-wavelength semiconductor laser. The device is realized as a photonic integrated circuit using active-passive integration technology, and fabricated on a multiproject wafer run, constituting a novel approach for a compact, low-cost dual-wavelength heterodyne source.
我们报告了通过光学混频两个相邻通道的阵列波导光栅多波长激光的波长产生 95GHz 的载波频率。该器件的扩展腔结构提供了低相位噪声和窄的光学线宽，进一步增强了阵列波导光栅的腔内滤波效应。我们证明了在 95GHz 下产生的射频差拍信号的-3dB 带宽为 250kHz。据我们所知，这是从自由运行的双波长半导体激光器产生的最窄的射频线宽。该器件使用有源-无源集成技术实现为光子集成电路，并在多项目晶圆运行上制造，构成了一种紧凑、低成本双波长外差源的新方法。
