Multiple-wavelength optical orthogonal codes under prime-sequence permutations

In this paper, a new family of wavelength-time codes, called multiple-wavelength optical orthogonal codes (MWOOCs), is constructed. The new codes use prime sequences for wavelength permutations on top of a time-spreading OOC. The advantage is that the code cardinality is a quadratic function of the number of wavelengths. This property is particularly useful in high bit-rate optical CDMA applications, in which the number of time slots is very restricted. This limitation can be compensated and even improved in our MWOOCs by increasing the number of available wavelengths, through the use of lasers with broadened supercontinuum spectrum