The axis of the integrated superluminescent light source was tilted with respect to the output facet normal for lasing suppression. A new phenomenon (lasing suppression) was observed in the tilted integrated device. Three new schemes were proposed and demonstrated further to suppress the lasing by analysing the reason for lasing in the tilted structure. The lasing was suppressed successfully at high pumping levels, and high superluminescent powers (more than 300 mW) were obtained at a pulsed condition with the spectral full width at half maximum of 25-30nm.