Yang Jingjing, Fan Jie, Zou Yonggang, Wang Haizhu, Ma Xiaohui
Opt Lett. 2022 May 1;47(9):2141-2144. doi: 10.1364/OL.458119.
A novel monolithic dual-wavelength tapered laser diode based on a composite distributed Bragg reflection (DBR) grating is demonstrated. The composite DBR grating, composed of two sub-gratings with different effective refractive indices, is designed. With the aid of the lateral expansion effect of the optical field in the ridge waveguide, the dual-wavelength operation of tapered laser diode is realized by using the composite DBR grating as a narrow linewidth filter. At the ridge current of 190-300 mA and the heat sink temperature of 20℃, the tapered laser diode obtains dual-wavelength emission with wavelengths of 1025.4 nm and 1036.2 nm, respectively. The linewidths of both wavelengths are less than 36 pm, and the minimum power difference between the two wavelengths is 1.2 dB. The spectral distance between the two wavelengths can be modulated from 10.4 nm to 10.9 nm by adjusting the heat sink temperature of the tapered laser diode from 13.8℃ to 20.7℃.
展示了一种基于复合分布式布拉格反射（DBR）光栅的新型单片双波长锥形激光二极管。设计了由两个具有不同有效折射率的子光栅组成的复合DBR光栅。借助脊形波导中光场的横向扩展效应，通过使用复合DBR光栅作为窄线宽滤波器来实现锥形激光二极管的双波长工作。在190 - 300 mA的脊电流和20℃的散热器温度下，锥形激光二极管分别获得波长为1025.4 nm和1036.2 nm的双波长发射。两个波长的线宽均小于36 pm，且两个波长之间的最小功率差为1.2 dB。通过将锥形激光二极管的散热器温度从13.8℃调节到20.7℃，两个波长之间的光谱间距可从10.4 nm调制到10.9 nm。
