Optical gain in O-band active regions with multiple dot-in-well layers. - Jandu, G. M.; Smith, A. R.; Allford, C. P.; Power, S.; Mishra, P.; Cao, Z.; Jarvis, L.; Zhang, X.; Deng, H.; Tang, M.; Liu, H.; Smowton, P. M. (APL Photonics, 2025)