ABSTRACT
In recent years, Code Division Multiple Access (OCDMA) optical networks have been widely used, which allows a large number of subscribers and provides high noise immunity to narrowband and pulsed interference. The main characteristics of OCDMA networks are the probability of an error per bit taking into account interference, the transmission rate of messages, the number of active subscribers and the network structure. OCDMA networks typically have a point-to-point or star topology, where each node has its own code. The transfer rate decreases rather slowly with an increase in the number of users. The main problem when transmitting information with code division multiplexing is the provision of a low level of interference interference. To solve this, it is necessary to use orthogonal optical sequences with good auto and cross-correlation properties. The use of such sequences allows one to achieve a low level of side peaks, which determine the noise of non-orthogonality and, accordingly, the level of interference interference. Increasing the level of which significantly increases the likelihood of error and reduces the data transfer rate. This article will describe the principles of the basic techniques fiber optic communication line with code division multiplexing.
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