Novel linear combinatorial code for wavelength-time OCDMA system

The scheme of the wavelength-time (λ-t) optical code division multiple access (OCDMA) system with a linear combinatorial code (LCC) proposed first in the paper is designed. The capacity and the bit error rate of system are analyzed. The result shows that two parameters, named as the number of sub-codeword and the maximum number of same sub-codeword in a LCC, determine the preference of the LCC. In LCCs system, the capacity is improved notably with the increase of the number of sub-codeword, and the bit error rate can be controlled by varying the combinatorial parameters of the code. When the number of sub-codeword is constant, the bit error rate is degraded with the increase of maximum value of same sub-codeword in all LCCs system. When the maximum value of same sub-codewords in all LCCs is fixed, the bit error rate is improved with the increase of the number of sub-codeword.