论文标题
使用外部光学反馈稳定多模跳和减少长波长激光二极管中相关的噪声
Stabilizing Multimode Hopping Oscillations and Reducing Associated Noise in Long Wavelength Laser Diode Using External Optical Feedback
论文作者
论文摘要
我们通过应用外部光学反馈（OFB）将多模跳振荡（MHO）转换为单模振荡（SMO）。我们表征并比较支持SMO和多模振荡时激光器的噪声性能。该研究基于激光的修改时间延迟多模速率方程模型，该模型包括光谱增益抑制的机理以及由于外部反射器的多次反射而引起的OFB。该研究适用于1.55UM-INGAASP激光器，该激光器以其孤立版本表现出多模型，并支持宽带宽度。根据相对强度噪声（RIN）评估噪声。我们表明，当OFB与不对称增益抑制（AGS）同步时，它会增强一个更长的波长模式的增益并支持SMO。在这种情况下，B可以改善激光的噪声性能。另一方面，当OFB对AGS起作用时，它会维持多模振荡（HMMO）并恶化侧模抑制比（SMSR）和噪声性能。
We report on converting the multimode hopping oscillation (MHO) in long-wavelength semiconductor laser into single-mode oscillation (SMO) by applying external optical feedback (OFB). We characterize and compare the noise performance of the laser when supporting SMO and multimode oscillations. The study is based on a modified time-delay multimode rate-equation model of the laser that includes mechanisms of spectral gain suppression along with OFB induced due to multiple reflections by an external reflector. The study is applied to 1.55um-InGaAsP laser that exhibits multimode hopping in its solitary version and supports wide bandwidth. The noise is evaluated in terms of the relative intensity noise (RIN). We show that when OFB synchronizes with the asymmetric gain suppression (AGS), it enhances the gain of one longer wavelength mode and supports SMO. In this case OFB improves the noise performance of the laser. On the other hand, when OFB works against AGS, it sustains hopping multimode oscillation (HMMO) and deteriorates the side-mode suppression ratio (SMSR) and the noise performance.
