Interference elimination in optical CDMA passive optical network using multiple-weight codewords

摘要

A spectral-amplitude coding optical code-division multiple access network for multimedia transmissions is proposed. This scheme allows users with different service requirements to transmit data without interference theoretically, and the number of service classes is flexible and can be any integer theoretically if the required light sources and optical components are available. Because the corresponding encoder/ decoder uses arrayed waveguide gratings of smaller physical sizes, the imperfect phenomenon such as crosstalk in the encoders is alleviated and the realization is more practical for the application of passive optical networks. When the bit error rate is smaller than 10~(-9), the effective number of active users in this scheme is larger than that of classical SAC schemes supporting no differentiated service.