Theoretical Analysis of Buried Heterostructure Laser for Stable Dual Wavelength Generation

• Soumi Pal, Arpit Khandelwal, and Nitin Bhatia
• received 02/29/2024; accepted 04/17/2024; posted 04/17/2024; Doc. ID 522669
• Abstract: Stable dual wavelength emission from a laser is desirable for microwave signal generation using the opticalheterodyning method. As both optical wavelengths are generated from the same cavity, the phase noise ofthe generated microwave signal is minimized. In this work, we exploit the inherent birefringence in theburied heterostructure (BH) semiconductor laser to generate dual polarized modes. We carefully analyzethe mode competition between various modes in the cavity and propose the desirable gain modificationconditions for stable dual mode oscillations when the laser is operating near the threshold. We show thatthe required asymmetry in the gain for two stable modes can be obtained from the mode confinementfactors and facet losses. We also show the applicability of our results to a homogeneously broadenedmultimode laser.