Electro-optically tunable laser with ultra-low tuning power dissipation and nanosecond-order wavelength switching for coherent networks
Electro-optically tunable laser with ultra-low tuning power dissipation and nanosecond-order wavelength switching for coherent networks
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用于相干网络的具有超低调谐功耗和纳秒级波长切换的电光可调谐激光器
DOI：
10.1364/optica.392820
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发表时间：
2020
期刊：
影响因子：
10.4
通讯作者：
Mitsuteru Ishikawa
中科院分区：
文献类型：
--
作者：
Y. Ueda;Takahiko Shindo;S. Kanazawa;Naoki Fujiwara;Mitsuteru Ishikawa
云计算快速增长背后的巨大数据流量给移动的前传和数据中心网络的运行带来了压力，因此需要改善其功耗和延迟。我们开发了一种电光可调谐激光二极管，采用可调谐滤波器，实际上是调整，即使有很小的折射率变化的电光效应。该激光器的实际调谐范围超过35 nm，线宽约为350 kHz，调谐功耗小于10 mW。我们还实现了100 Gb/s相干信号小于50 ns的高速光开关。除了在光通信中的应用之外，电光可调谐激光二极管还有益于激光传感应用，因为其较高的调谐速度增加了传感系统的时间分辨率。此外，传统上难以与高速调谐协调的窄线宽也可以在使用相干检测时实现更长的感测距离和/或更高的信噪比。我们的研究结果表明，我们可以利用电光效应来克服传统的可调谐激光二极管的局限性，并彻底改变光通信和激光传感系统。
The huge amount of data traffic behind the rapid growth of cloud computing is putting pressure on the operation of mobile fronthauls and data center networks so there is a need to improve their power consumption and latency. We developed an electro-optically tunable laser diode employing a tunable filter that is practically tuned even with small refractive index change of the electro-optic effect. The laser shows a small tuning power dissipation of less than 10 mW for a practical tuning range of over 35 nm with a linewidth of about 350 kHz. We also achieved high-speed optical switching of less than 50 ns for 100 Gb/s coherent signals. In addition to its application in optical communications, the electro-optically tunable laser diode is also beneficial to laser sensing applications because its higher tuning speed increases the time resolution of the sensing system. Furthermore, a narrow linewidth, conventionally difficult to reconcile with high-speed tuning, can also enable a longer sensing distance and/or a higher signal-to-noise ratio when using coherent detection. Our result shows that we can use the electro-optic effect to overcome the limitations of conventional tunable laser diodes and drastically change optical communications and laser sensing systems.