简单双段量子点锁模激光器中偏压分辨的梳状谱形成机制，用于无隔离器、太比特级O波段互连
Bias-resolved comb-formation regimes in a simple two-section quantum-dot mode-locked laser for isolator-free, terabit-scale O-band interconnects
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中文总结 AI 辅助
本研究绘制双段量子点锁模激光器的偏压平面，区分短脉冲、宽带、低噪声、可传输及反馈稳定等不同工作区，实现无隔离器太比特级O波段互连。
中文摘要 AI 辅助
实际的O波段量子点锁模梳状光源必须同时具备宽平顶带宽、低射频定时噪声、可纠错的裸线调制以及反馈容限，然而这些功能通常被单独优化，且它们与梳状谱形成动力学之间的关系仍不清楚。本文绘制了简单双段InAs/GaAs量子点锁模激光器的增益电流/饱和吸收体偏压平面，以分辨不同的应用特定工作区。低注入、高反向偏压区产生0.80 ps脉冲，与幅度调制工作方式一致；而高注入、中等偏压区则产生16.16 nm（2.75 THz）平顶梳状谱，包含110条谱线，波形延伸至14.98 ps，与更强的频率调制贡献一致。据我们所知，这是量子点锁模梳状光源中报道的最宽3 dB带宽。在另一个低噪声偏压点，拍频表现出0.58 kHz洛伦兹线宽，并在4至80 MHz范围内积分定时抖动为41.6 fs，据我们所知，这是高信道数O波段量子点无源梳状光源中报道的最低值。在无隔离器25 Gb/s NRZ传输中，13.73 nm 3 dB带宽内的所有94个载波均低于7% HD-FEC阈值。使用最大带宽偏压下的全部110个载波，预计总速率可达2.75 Tb/s。在另一个反馈测试偏压点，宽带锁模得以保持，且当反馈超过约-28 dB时，射频拍频进入反馈稳定区，其线宽缩小42倍。因此，短脉冲、宽带、低噪声、可传输和反馈稳定的工作状态分别占据不同的可选区域，而非单一通用最优状态。该区域分辨图将量子点梳状谱形成物理与无隔离器、太比特级O波段互连联系起来。
英文摘要
Practical O-band quantum-dot (QD) mode-locked comb sources must combine wide flat-top bandwidth, low radio-frequency (RF) timing noise, error-correctable bare-line modulation, and feedback tolerance, yet these functions are usually optimized separately and their relation to comb-formation dynamics remains unclear. Here we map the gain-current/saturable-absorber-bias plane of a simple two-section InAs/GaAs QD mode-locked laser to resolve distinct application-specific regimes. A low-injection, high-reverse-bias regime produces 0.80 ps pulses, consistent with amplitude-modulated operation, whereas a high-injection, intermediate-bias regime yields a 16.16 nm (2.75 THz) flat-top comb with 110 lines and a 14.98 ps extended waveform, consistent with a stronger frequency-modulated contribution. To our knowledge, this is the broadest reported 3 dB bandwidth among QD mode-locked comb sources. At a separate low-noise bias, the beatnote exhibits a 0.58 kHz Lorentzian linewidth and a 41.6 fs integrated timing jitter over the 4 to 80 MHz range, to our knowledge the lowest reported for a high-channel-count O-band QD passive comb. In isolator-free 25 Gb/s NRZ transmission, all 94 carriers across a 13.73 nm 3 dB band remain below the 7 percent HD-FEC threshold. Using all 110 carriers at the maximum-bandwidth bias gives a projected aggregate rate of 2.75 Tb/s. At a separate feedback-test bias, broadband mode locking is preserved and, beyond approximately -28 dB feedback, the RF beatnote enters a feedback-stabilized regime whose linewidth is reduced 42-fold. Thus, short-pulse, broadband, low-noise, transmission-ready, and feedback-stabilized operation occupy distinct selectable regions rather than a single universal optimum. This regime-resolved map links QD comb-formation physics to isolator-free, terabit-scale O-band interconnects.
