研制了1550 nm波段的窄线宽、低噪声混合集成外腔半导体激光器,将保偏光纤布拉格光栅(FBG)作为反馈元件与半导体增益芯片进行耦合,并利用FBG斜边处的大群时延特性将半导体激光器的线宽压窄。所得到的蝶形封装激光器原型器件实现了稳定的单纵模、单偏振激光的保偏输出,在1 kHz处积分线宽为15.9 kHz的输出功率≥30 mW,洛伦兹线宽为4.85 kHz,本征线宽为4.06 kHz,相对强度噪声≤-155 dB·Hz ^-1@1 MHz,偏振消光比>25 dB,无跳模电流调谐范围≥8 GHz,无跳模温度调谐范围≥14 GHz,6 h功率稳定度为1.7%,频率漂移量<50 MHz。

A narrow-linewidth, low-noise hybrid integrated external cavity laser at 1550 nm is fabricated, the polarization maintaining fiber Bragg grating (FBG) as optical feedback component is coupled with the semiconductor gain chip, and the laser linewidth is reduced by the large group delay characteristics at the sloping side of the FBG reflectance spectrum. The butterfly-packaged laser realizes a single longitudinal mode and polarization-maintaining output of the single polarization laser, including the output power ≥30 mW with integral linewidth of 15.9 kHz at 1 kHz, the Lorentz linewidth of 4.85 kHz, the intrinsic linewidth of 4.06 kHz, the relative intensity noise ≤-155 dB·Hz -1 at 1 MHz, the polarization extinction ratio >25 dB, the current tuning range without mode hopping ≥8 GHz, the temperature tuning range without mode hopping ≥14 GHz, the power stability of 1.7% within 6 h, and the frequency variations <50 MHz.