マルチモードVCSELのモードパーティションノイズを,横の幾何学制御を介して抑制する
Optics express
|February 20, 2026
まとめ
レーザー開口の幾何学を最適化すると,垂直孔の表面放射レーザー (VCSEL) のモードパーティションノイズ (MPN) が抑制されます. この幾何学的なアプローチは,高速光学相互接続の性能を向上させます.
科学分野:
- フォトニクスと光学工学
- 半導体デバイスの物理 半導体デバイスの物理
背景:
- モードパーティションノイズ (MPN) は,垂直孔表面発射レーザー (VCSEL) を利用する高速短距離光学リンクにおける重要な課題です.
- MPNは,VCSEL腔内の異なる横向きモード群の複雑な相互作用から生じる.
- MPN抑制のための既存の方法は,しばしばVCSELの固有の性能に影響を与える.
研究 の 目的:
- VCSELにおけるMPN抑制のための幾何学主導のアプローチを調査する.
- 横断アパートル幾何学と横断モダルの分布とMPNの特徴を相関させるため.
- 最適化されたVCSEL設計を通じて,光学インターコネクトの性能指標を向上させることを実証する.
主な方法:
- 異なる横開口幾何学を持つ3つのVCSELの製造と特徴付け.
- 静的および小信号性能特性の分析.
- 平方根平均 (RMS) のスペクトル幅と低周波相対強度ノイズ (RIN) の測定.
- トランスミッター分散眼閉四次 (TDECQ) とバック・トゥ・バックおよびファイバー伝送シナリオにおけるタイミングジッターの評価.
主要な成果:
- 横開口の幾何学は,横断モデルの分布とMPNの主要な決定因子であることが判明しました.
- 非対称な開口設計は,モダルのエネルギーを支配的なモードグループに集中させ,MPNを大幅に削減しました.
- 最適化されたVCSELは,0.387nmのRMSスペクトル幅と観測されたRINの最低値を達成しました.
- 優れたTDECQ (0.86dB連続,100m OM4ファイバー後1.24dB) と低タイミングジッター (6.65ps,8.03ps) が記録されました.
結論:
- 横方向幾何学の最適化は,VCSELにおけるMPNを抑制するための効果的な戦略です.
- このアプローチは,レーザーの本質的な特性を損なうことなく,光学相互接続の性能を向上させます.
- この発見により,高速度アプリケーションの要求に合わせて,より高利率の光学相互接続が可能になる.
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