Improving the code capacity is a key of optical code division multiple access (OCDMA) system, and the usual method is to search for new code structure. We propose a novel way to facture π/n equivalent phase shift (EPS) OCDMA en/decoders without studying the code structure. The method only changes the physical structure of fiber grating and can enhance the soft-capacity for 5 times. Based on the fiber grating fabrication plot we fabric π/5- and 2π/5-EPS en/decoders. The results of simulation and experiment show the π/n-EPS en/decoders can get better performance than the ordinarily one.