The parallel multi-wavelength light source plays a critical role in optical input/output (I/O) systems by providing multiple wavelengths to enhance data transmission capacity and flexibility. This paper proposes and experimentally demonstrates a novel on-chip parallel multiwavelength light source based on an 8-wavelength distributed feedback (DFB) laser array, an arrayed waveguide grating (AWG), and Ybranches light power splitter for optical I/O applications. The π-phase-shifted laser array is designed using the reconstructed equivalent chirp (REC) method for precise wavelength control. The AWG is designed for 8-wavelength multiplexing, while the Y-branches function as output interfaces, supporting 64 channels across 8 ports simultaneously. An output power exceeding 6.9 dBm is achieved at each of the 8 output ports. Furthermore, the linewidth of representative wavelength is measured to be 361.5 kHz, and clear 25 Gb/s non-return-to-zero (NRZ) eye diagrams are obtained. The proposed parallel multi-wavelength source scheme offers a compact and promising solution for advancing optical I/O technology.