Performance of code-division-multiple-access communications over multimode optical fiber channels

This paper presents results from a theoretical investigation to evaluate the performance of code-division-multiple-access communications over multimode optical fiber channels in an asynchronous, multi-user, communication network environment. Gold sequences are used in spectral spreading of user signals, employing direct-sequence biphase-shift-keying and intensity modulation techniques. The channel model employed is a lossless linear system approximation of the field transfer function for the α-profile multimode optical fiber. The performance measures for the system; i.e., signal-to-noise ratio and bit-error probability at the ith receiver are derived as functions of channel characteristics, spectral spreading, number of active users, and the bit energy to noise (white) spectral density ratio and are used to characterize the overall system performance