Pulse combining and time-space coding for multiple accessing with fiber arrays

Summary form only given. The results of theoretical and experimental studies evaluating the use of pulse sequences for code-division multiple accessing for networking, data distribution, and various applications are summarized. Removal of phase noise effects is of prime importance, as they can be much more severe than the multiple accessing interference. One study has shown that the phase noise effect depends on the source linewidth, the accuracy of the correlator design, and the sequence pulse widths and that the latter should be about 3-5 times the laser coherence time. Electronic correlators avoid the phase noise problem and are generally superior to optical correlators provided accurate bit timing is maintained and the data rates are not excessive.<>