Ultra-broadband flat-top quantum do comb lasers
Ultra-broadband flat-top quantum do comb lasers
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DOI：
10.1364/prj.446349
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发表时间：
2022-05-01
影响因子：
7.6
通讯作者：
Zhang, Jian-Jun
中科院分区：
文献类型：
--
作者：
Huang, Jing-Zhi;Ji, Zi-Tao;Zhang, Jian-Jun
量子点（QD）锁模激光器作为主动梳状发生器利用其小尺寸、低功耗、大光学带宽和高温稳定性的优点，这是用于光通信、光学互连和激光雷达等应用的理想多波长源。报道了一种基于InAs/GaAs量子点增益结构的四阶碰撞脉冲锁模激光器（CPML），该激光器能够在O波段产生超稳定的光频梳，频率间隔为100 GHz，工作温度高达100 ℃。在25 ℃时，获得了3dB光带宽为11.5nm（20条梳线）的创纪录的平顶光梳。梳状线的平均光学线宽被测量为440 kHz。单通道不归零调制速率为70 Gbit/s，四电平脉冲幅度调制为40 GBaudis。为了进一步扩展梳状带宽，提出了在不同温度下驱动的QD-CPML阵列，以实现36 nm的光学带宽（包含60个具有100 GHz模式间隔的梳状线），能够实现4.8 Tbit/s的总传输容量。实验结果表明，利用量子点CPML作为宽带梳状光源构建未来大带宽、高功率效率的光互连是可行的。(C)2022中国激光出版社
A quantum dot (QD) mode-locked laser as an active comb generator takes advantage of its small footprint, low power consumption, large optical bandwidth, and high-temperature stability, which is an ideal multi-wavelength source for applications such as datacom, optical interconnects, and LIDAR. In this work, we report a fourth-order colliding pulse mode-locked laser (CPML) based on InAs/GaAs QD gain structure, which can generate ultra-stable optical frequency combs in the O-band with 100 GHz spacing at operation temperature up to 100 degrees C. A record-high flat-top optical comb is achieved with 3 dB optical bandwidth of 11.5 nm (20 comb lines) at 25 degrees C. The average optical linewidth of comb lines is measured as 440 kHz. Single-channel non-return-to-zero modulation rates of 70 Gbit/s and four-level pulse amplitude modulation of 40 GBaudis are also demonstrated. To further extend the comb bandwidth, an array of QD-CPMLs driven at separate temperatures is proposed to achieve 36 nm optical bandwidth (containing 60 comb lines with 100 GHz mode spacing), capable of a total transmission capacity of 4.8 Tbit/s. The demonstrated results show the feasibility of using the QD-CPML as a desirable broadband comb source to build future large-bandwidth and power-efficient optical interconnects. (C) 2022 Chinese Laser Press