The Common Influence of Time Shift and Appearing Place of Interference on Signal Propagation along Optical Fiber

Abstract

It is common knowledge that dispersion affects signal propagation along an optical fiber. Providing that a signal propagates along optical telecommunication systems at a high data rate and at a long distance, the influence of nonlinear effects on signal propagation should be taken into consideration. Since nonlinear effects decrease negative influence of dispersive effects, they are desirable if systems work under anomalous dispersive regime. The influence of interferences, which are often present in optical systems and can appear anywhere along the fiber, can be considerable. Bearing this in mind, the subject of this paper is to investigate the influence of one interference, that appears at the beginning or in the middle of an optical fiber and influence of two simultaneous interferences that appear at the beginning and in the middle of a fiber, respectively. In addition to the previously mentioned, the paper studies time shift influence of interference on propagation of Gaussian signal along an optical fiber, as well. All these influences are considered by pulse shape at the end of optical fiber for SIR (signal-to-interference ratio) equals 10dB or 20dB. The pulse at the receiver is determined by solving Schrödinger equation. Ill. 5, bibl. 9 (in English; summaries in Lithuanian, English and Russian).