Butler S M, Bakoz A P, Singaravelu P K J, Liles A A, O'Shaughnessy B, Viktorov E A, O'Faolain L, Hegarty S P
Opt Express. 2019 Apr 15;27(8):11312-11322. doi: 10.1364/OE.27.011312.
We demonstrate frequency modulation (FM) in an external cavity (EC) III-V/silicon laser, comprising a reflective semiconductor optical amplifier (RSOA) and a silicon nitride (SiN) waveguide vertically coupled to a 2D silicon photonic crystal (PhC) cavity. The PhC cavity acts as a tunable narrowband reflector giving wavelength selectivity. The FM was achieved by thermo-optical modulation of the reflector via a p-n junction. Single-mode operation was ensured by the short cavity length, overlapping only one longitudinal laser mode with the reflector. We investigate the effect of reflector modulation theoretically and experimentally and predict a substantial tracking of the resonator by the laser frequency with very small intensity modulation (IM).
我们展示了外腔（EC）III-V族/硅激光器中的频率调制（FM），该激光器包括一个反射半导体光放大器（RSOA）和一个垂直耦合到二维硅光子晶体（PhC）腔的氮化硅（SiN）波导。PhC腔用作提供波长选择性的可调谐窄带反射器。通过经由p-n结的反射器的热光调制实现了FM。短腔长度确保了单模运行，仅使一个纵向激光模式与反射器重叠。我们从理论和实验上研究了反射器调制的影响，并预测在非常小的强度调制（IM）下激光频率对谐振器的大幅跟踪。
