Abstract
A numerical simulation study of the performance of encoding and decoding of short optical pulse in OCDMA (Optical Code Division Multiple Access) systems under non-linear optical effects is presented. The performance of encoding and decoding short pulses is obtained through use of device FBG (fiber Bragg grating) where the codes are inserted through discrete jumps in the optical phase (±π). The multiuser interference is also the object of the present study, where a figure of merit (interference figure) is used to quantify the interference in multiuser auto and cross correlation. We evaluate the dependence of the multiuser interference for the coupling constant of FBG. Finally, the interference inserted in the autocorrelation due to nonlinear effects generated in the nonlinear switching of the coded pulse in a dual core nonlinear directional coupler is examined, where temporal broadening of pulses decoded is observed.
Highlights
The increasing demand for traffic information is leading to an increase of the capacity and functionality of communication systems
The performance of encoding and decoding of short optical pulses is obtained using fiber Bragg gratings (FBG), in which the Gold codes are inserted through discrete jumps in the optical phase (±π)
The process of encoding and decoding of short pulses, using spectral phase coding, was studied in the context of multiuser interference and interference associated to nonlinearities in a dual core optical coupler
Summary
The increasing demand for traffic information is leading to an increase of the capacity and functionality of communication systems In this context, characteristics such as bandwidth, security of transmitted information and the data rate transmission, are critical to the evolution of systems. Characteristics such as bandwidth, security of transmitted information and the data rate transmission, are critical to the evolution of systems In this sense, access and multiplexing techniques allow the simultaneous existence of multiple users on the network sharing the same optical domain. The OCDMA technology uses the temporal encoding employing a delay line network In this method, an ultrashort optical pulse is converted into a pulse train with low intensity, so each replica pulse occupies a temporal position according to the delay line, resulting in the coded pulse. A second delay line network having a complementary delay response was used so that the pulses in the train are despread into the same time slot [3]
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