Dizaji Mohammad Rezagholipour, Krückel Clemens J, Fülöp Attila, Andrekson Peter A, Torres-Company Victor, Chen Lawrence R
Opt Express. 2017 May 29;25(11):12100-12108. doi: 10.1364/OE.25.012100.
Silicon nitride (SixNy) waveguides constitute a technology platform to realize optical signal processing based on the nonlinear Kerr effect. Varying the stoichiometry of the core (i.e., x and y in silicon nitride) provides an additional degree of freedom for engineering the waveguide properties, such as nonlinear Kerr parameter and dispersion. We demonstrate low-stress high-confinement silicon-rich nitride waveguides with flat and anomalous dispersion over the entire C and L optical wavelength transmission bands for optical signal processing based on cross-phase modulation. The waveguides do not show any nonlinear loss for a measured optical input intensity of up to 1.5 × 10 W/cm. In particular, we achieve wavelength conversion of 10 Gb/s signals across the C band; XPM broadening is also observed in the O band. In addition, we highlight the use of SixNy waveguides for nonlinear microwave photonics. Specifically, we demonstrate radio-frequency spectral monitoring of optical signals with a bandwidth of hundreds of gigahertz.
氮化硅（SixNy）波导构成了一个基于非线性克尔效应实现光信号处理的技术平台。改变纤芯的化学计量比（即氮化硅中的x和y）为设计波导特性（如非线性克尔参数和色散）提供了额外的自由度。我们展示了用于基于交叉相位调制的光信号处理的低应力、高限制的富硅氮化物波导，其在整个C和L光波长传输波段具有平坦和反常色散。对于高达1.5×10 W/cm的测量光输入强度，这些波导未显示出任何非线性损耗。特别是，我们实现了C波段10 Gb/s信号的波长转换；在O波段也观察到了交叉相位调制展宽。此外，我们强调了SixNy波导在非线性微波光子学中的应用。具体而言，我们展示了对带宽达数百吉赫兹的光信号进行射频频谱监测。
