Optical pulse source is one of the key techniques in optical code-division multiple access (OCDMA), and optical source affects the performance of the OCDMA system directly. The pulse chirp’s effect on performance of OCDMA temporal phase en/decoder is researched, and the feasibility of employing optical pulse source with frequency chirp in OCDMA is analyzed. Based on gain-switched distributed feedback (DFB) laser and equivalent phase-shifted superstructured fiber Bragg grating en/decoder, a 60 km OCDMA transmission at the rate of 2.5 Gb/s with bit error rate lower than 10-9 is experimentally demonstrated. The of theoretical analysis and experimental results indicate that the optical pulse source with frequency chirp can be applied in OCDMA system, which is significant for reducing the system cost and enhancing the practicality of OCDMA technology.