Effective design of optical code-division multiple access networks by using the modified prime code

In optical code-division multiple access (OCDMA) networks using a well-known prime code, the code weight w is always fixed to the maximum number of users M (i.e. the code size). When M becomes very large the resulting cost and optical power losses of OCDMA encoder/decoder can be very high. To overcome this difficulty, an efficient design is presented for OCDMA networks, which is based on the modified prime (MPR) codes. The use of MPR codes can maintain the fixed w for a given bit error rate and any M. While MPR codes still preserve the same cross-correlation constraint as prime codes