In recent years, several methods have been found to construct chaotic sequences, which have good correlation
properties and increase security of the transmission. The length of chaotic sequence can be choosed in terms of the
situation, and the balance property can be controlled. In this paper, using the Chebyshev map of third degree, we design a
kind of true balanced chaotic sequence in which the number of "+1" and "-1" are equal and apply them into
non-coherent OCDMA system with balance complementary structure to reduce the complexity of the system and
improve system performance. In terms of BER, our numerical simulations show that systems based on chaotic spreading
sequences perform better than Gold sequence.
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