在多模式VCSEL中通过横向几何控制来抑制模式分区噪声
Optics express
|February 20, 2026
概括
优化激光孔径几何学可以抑制垂直腔表面发射激光器 (VCSEL) 的模式分区噪声 (MPN). 这种以几何驱动的方法提高了高速光学互连的性能.
科学领域:
- 光子学和光学工程 光子学和光学工程
- 半导体设备物理 半导体设备物理
背景情况:
- 模式分区噪声 (MPN) 是使用垂直腔表面发射激光器 (VCSEL) 的高速短距离光学链路的一个重大挑战.
- MPN是由VCSEL腔内的不同横向模式组的复杂相互作用引起的.
- 现有的MPN抑制方法往往会影响VCSEL的内在性能.
研究的目的:
- 研究一种以几何驱动的方法来抑制VCSEL中的MPN.
- 为了将横向光圈几何与横向模态分布和MPN特征相关联.
- 通过优化VCSEL设计来证明光学互连的改进性能指标.
主要方法:
- 三个具有不同的侧孔几何形状的VCSEL的制造和表征.
- 静态和小信号性能特征的分析.
- 测量平方根平均 (RMS) 光谱宽度和低频相对强度噪声 (RIN).
- 在背对背和光纤传输场景中评估发射器分散闭眼四元期 (TDECQ) 和定时动.
主要成果:
- 发现侧向孔径几何是横向模态分布和MPN的主要决定因素.
- 一个不对称的光圈设计将模式能量集中到一个主导模式组中,显著减少了MPN.
- 优化的VCSEL实现了0.387nm的RMS光谱宽度和观察到的最低RIN.
- 记录了出色的TDECQ (0.86dB背靠背,100米OM4光纤后1.24dB) 和低定时动 (6.65ps,8.03ps).
结论:
- 侧面几何优化是抑制VCSEL中MPN的有效策略.
- 这种方法可以提高光学互连的性能,而不会影响激光器的内在特性.
- 这些发现使高利率的光学互连能够满足高速度应用的要求.
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