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多波长窄线宽激光光源可以大幅降低高密度波分复用器(DWDM)光网络节点设备的光源成本。用有源光纤环形腔内相位调制方法来产生多波长光源,避免了激光阈值特性引起的模式竞争导致的输出功率稳定性差的缺点,通过腔长控制与射频调制频率调节可以实现数百个波长窄线宽激光稳定输出,导出了该方法产生多波长光源光波表达式。数值计算结果表明:相对总输出和单波长相对输出与组成光纤环形腔的输入/输出耦合器的耦合系数和相位调制器的相位调制深度有关,耦合器的耦合系数在0.9以下,同时相位调制深度在2.0 rad以上有利于输出功率稳定,总输出和单波长输出功率分别达到几百毫瓦和毫瓦级。对任意边带激光线宽的理论分析和计算显示:在腔内环行时间不是远大于输入光的相干时间时,任一波长激光的线宽与输入激光的线宽相当。
Multi-wavelength narrow-linewidth laser light source can significantly reduce the light source cost of high-density wavelength division multiplexer (DWDM) optical network node device. The multi-wavelength light source is produced by the phase modulation method in the active fiber ring cavity to avoid the disadvantage of poor stability of the output power due to the mode competition caused by the laser threshold characteristic. The cavity length control and the RF modulation frequency adjustment can achieve hundreds of wavelength narrow The linewidth laser output is stable, and the expression of light wave generated by this method is derived. The numerical results show that the relative total output and single-wavelength relative output are related to the coupling coefficient of the input / output coupler and the phase modulator depth of the phase modulator. The coupling coefficient of the coupler is below 0.9 and the phase modulation depth Above 2.0 rad, the output power is stable, and the total output and single-wavelength output power reach several hundred milliwatts and milliwatt respectively. The theoretical analysis and calculation of the laser linewidth of any sideband show that the linewidth of any wavelength laser is equivalent to the linewidth of the input laser when the intracavity rotation time is not much longer than the input light coherence time.