InAs quantum dot (QD) ridge waveguide (RWG) lasers comprising single-port multi-mode-interference-reflectors (MMIR) and single-cleaved reflectors are designed, fabricated, and characterized, to demonstrate capability for optoelectronic-integrated circuits. Simulations of an MMI- R show high values of fundamental mode reflectivity (> 80%) and good selectivity against higher-order modes. Deep-etched MMIR lasers fabricated with 0.5 mm long cavities have a threshold current of 24 mA, compared to 75 mA for standard cleaved-cleaved RWG lasers of the same length, both at 25 oC, and 56 mA compared to 102 mA at 55 oC. MMIR lasers exhibit stable ground state operation up to 50oC and show promise as small footprint sources for integrated photonics.

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