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We present a comparative analysis of performance characteristics of the optical code-division multiple-access systems, which are based on spectralamplitude coding (SAC) and are implemented using eight different one-dimensional optical codes and a multi-array laser. We try to find the best code for the SAC systems by taking into consideration such parameters as system requirements for the number of users, the data rate and the type of network suitable for a particular code. Our simulations reveal that the capacity of the SAC systems can be improved when those systems are implemented with a laser rather than incoherent light source. Moreover, we demonstrate that the laser-based SAC system performs well in terms of high data rates, which is followed by improved bit error rates occurring with increasing number of users. As a trade-off among different performance characteristics, different optical codes under analysis can be applied for different specific communication systems. The suggested codes support the maximal data rates up to 12 Gbps for approximately 50 users. The maximal fibre length that supports error-free transmission is equal to 70 km. [ABSTRACT FROM AUTHOR]