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有源光纤环形腔内相位调制产生多波长激光 被引量:7

Multi-Wavelength Laser Generated by an Active Fiber Ring Resonator Incorporating an Optical Phase Modulator
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摘要 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 lasers can greatly reduce the cost for light sources used in dense warelength division multi-plexing(DWDM) optical network node equipment.A way to achieve it by an active fiber ring resonator incorporating an optical phase modulator is proposeed.Its output power is stable because there is no mode competition in it.Hundreds of laser wavelengths can be achieved when the frequencies of input laser and radio frequency modulation signal coincide with the frequency of the resonator's longitudinal mode.The expression of the multi-wavelength laser is derived.Computed results show that the relative total output and the single-wavelength relative output are related to modulation depth of phase modulator and coupling coefficient of the input/output coupler.The coupling coefficient below 0.9 and the phase modulation depth above 2.0 rad benefit stability of output power.Total output and single-wavelength output power can reach several hundreds milliwatt and milliwatt levels. Theoretical analysis and calculations show the linewidth of any laser wavelength in the multi-wavelength laser is about equal to that of input laser when the circulating time inside the resonator is not much larger than coherent time of input laser.
作者 胡宗福 王浩
出处 《光学学报》 EI CAS CSCD 北大核心 2010年第3期833-838,共6页 Acta Optica Sinica
基金 国家自然科学基金(60972002)资助课题
关键词 激光技术 多波长激光 有源光纤环形腔 相位调制 laser technique multi-wavelength laser active fiber ring resonator phase modulation
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