Andreou Stefanos, Williams Kevin A, Bente Erwin A J M
Opt Express. 2019 Sep 16;27(19):26281-26294. doi: 10.1364/OE.27.026281.
We investigate the effect of a ring resonator on the linewidth and output spectrum of monolithically integrated extended cavity multi-section DBR lasers with an intra-cavity ring resonator. The goal is to achieve an understanding of whether and how the use of an additional ring filter improves the performance of a DBR laser on the aspects of the SMSR and intrinsic linewidth using the capabilities of the InP active-passive integration platform. The laser output spectrum is in good agreement with our theoretical calculations from a steady-state spectral model. A side-mode suppression ratio between 60 and 70 dB is measured for a range of operating semiconductor optical amplifier currents. The frequency noise power spectral density is measured for a range of output power levels. A minimum intrinsic linewidth of 63 kHz is reported. We compare the measured Lorentzian linewidths with our theoretical expectations and present estimates of the possible linewidth improvement with the available photonic integration technology used in this work.
我们研究了环形谐振器对具有腔内环形谐振器的单片集成扩展腔多段分布布拉格反射（DBR）激光器的线宽和输出光谱的影响。目标是利用InP有源-无源集成平台的能力，了解额外的环形滤波器的使用是否以及如何在边模抑制比（SMSR）和本征线宽方面提高DBR激光器的性能。激光输出光谱与我们从稳态光谱模型得出的理论计算结果吻合良好。在一系列工作的半导体光放大器电流范围内，测得的边模抑制比在60至70 dB之间。在一系列输出功率水平下测量了频率噪声功率谱密度。报告的最小本征线宽为63 kHz。我们将测得的洛伦兹线宽与我们的理论预期进行比较，并给出了使用本工作中可用的光子集成技术可能实现的线宽改善的估计。
