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High-channel-count 20 GHz passively mode-locked quantum dot laser directly grown on Si with 4.1 Tbit/s transmission capacity
Optica ( IF 10.4 ) Pub Date : 2019-01-25 , DOI: 10.1364/optica.6.000128
Songtao Liu , Xinru Wu , Daehwan Jung , Justin C. Norman , M. J. Kennedy , Hon K. Tsang , Arthur C. Gossard , John E. Bowers

Low-cost, small-footprint, highly efficient, and mass-producible on-chip wavelength-division-multiplexing (WDM) light sources are key components in future silicon electronic and photonic integrated circuits (EPICs), which can fulfill the rapidly increasing bandwidth and lower energy per bit requirements. We present here, for the first time to our knowledge, a low-noise high-channel-count 20 GHz passively mode-locked quantum dot laser grown on a complementary metal-oxide-semiconductor compatible on-axis (001) silicon substrate. The laser demonstrates a wide mode-locking regime in the O band. A record low timing jitter value for passively mode-locked semiconductor lasers of 82.7 fs (4–80 MHz) and a narrow RF 3 dB linewidth of 1.8 kHz are measured. The 3 dB optical bandwidth of the comb is 6.1 nm (containing 58 lines, with 80 lines within the 10 dB bandwidth). The integrated average relative intensity noise values of the whole spectrum and a single wavelength channel are 152 dB/Hz and 133 dB/Hz in the frequency range from 10 MHz to 10 GHz, respectively. Utilizing 64 channels, an aggregate total transmission capacity of 4.1 terabits per second is realized by employing a 32 Gbaud Nyquist four-level pulse amplitude modulation format. The demonstrated performance makes the laser a compelling on-chip WDM source for multi-terabit/s optical interconnects in future large-scale silicon EPICs.

中文翻译:

直接在Si上生长的高通道数20 GHz无源锁模量子点激光器,传输容量为4.1 Tbit / s

低成本,占地面积小,高效且可批量生产的片上波分复用(WDM)光源是未来硅电子和光子集成电路(EPIC)的关键组件,可以满足快速增长的带宽以及更低的每位能量需求。我们在此首次了解到,是在互补金属氧化物半导体兼容轴(001)硅基板上生长的低噪声,高通道数20 GHz被动锁模量子点激光器。激光在O波段表现出较宽的锁模状态。对于被动锁模半导体激光器,其创纪录的低定时抖动值为82.7 fs(4–80 MHz),并且RF 3 dB的窄线宽为1.8 kHz。梳子的3 dB光带宽为6.1 nm(包含58条线,10 dB带宽内的80条线)。整个光谱和单个波长通道的积分平均相对强度噪声值为-152 D b/赫兹-133 D b/赫兹分别在10 MHz至10 GHz的频率范围内。通过使用32 Gbaud Nyquist四级脉冲幅度调制格式,利用64个通道,可以实现每秒4.1 TB的总总传输容量。所展示的性能使该激光器成为未来大型硅EPIC中用于多兆位/秒光学互连的引人注目的片上WDM光源。
更新日期:2019-02-20
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