提出一种新颖的单片集成双微环耦合的双波长半导体激光器结构.集成于激光腔内的2个微环谐振腔作为模式选择滤波器,通过游标效应选择谐振模式,同时还可作为等效的反射镜面以形成行波腔.这种无需解理的行波激光腔代替了需要解理面的法布里-珀罗驻波腔.理论仿真表明,跟驻波腔结构相比,行波腔双微环激光器结构简单,可获得约34 mA的较低的阈值电流和大于31 dB的边模抑制比.合理地控制有源区的增益峰值和谐振模式分布,该激光器能提供一致性和稳定性较好的双波长激光输出.

A novel monolithically integrated double microring resonator coupled dual-wavelength semiconductor laser is proposed.Two microring resonators incorporated in the laser cavity are used as the strong mode-selection filters to select the resonance modes by vernier effect and the equivalent reflective mirrors to form the traveling-wave cavity.A cleavage-free traveling-wave laser cavity replaces the standing-wave FP cavity formed by cleaved reflective facets.Theoretical simulations show that,compared to standing-wave supported structures,traveling-wave structure double microring coupled laser offers many promising advantages,including simple fabrication,reasonably low threshold current of about 34 mA and good side-mode suppression ratio (SMSR) of over 31 dB.The new design can provide dual wavelength lasing with excellent uniformity and stability as the gain peak of the active region and the resonance modes distribution are controlled properly.