Low cost optical network unit (ONU) light sources based on tunable distributed feedback (DFB) laser array using for wavelength division multiplexing-passive optical network (WDM-PON) are fabricated by nanoimprint lithography (NIL) and butt-joint regrowth (BJR). The multi-mode interference coupler (MMI) is used as output device for the monolithic integrated device. The tested results indicate that, the threshold current is less than 10 mA, side mode suppression ratio (SMSR) is higher than 40 dB, tunable range is wider than 10 nm and output power is larger than 0.2 mW.