Double microring resonator coupled dual-wavelength semiconductor lasers

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.