Cascaded optical communication systems with in-line semiconductor optical amplifiers

Abstract

The optimization of the performance of installed standard-monomode fibers based optical transmission systems with in-line semiconductor optical amplifiers (SOA's) is reported in this paper. Both solitons and nonreturn-to-zero (NRZ) signals are studied and their capacities are compared. This investigation is based on numerical simulations by solving the nonlinear Schrödinger equations with the split-step method while the SOA is simulated with two different models that we show to be in a good agreement. Transmissions over distances of the order of several hundreds of kilometers are shown to be possible, and very long distances can be reached expecially if in-line sliding filters are used.

Amplification of solitary optical waves in fibers with positive group velocity dispersion

“…Fiber transmission system with periodic amplification of optical pulses with SLA and bandpass optical filters is a typical system for consideration of such waves. In difference with the papers [2][3][4][5][6][7], where the model with averaged amplification (see below) was used in the study of such fiber transmission systems, we apply here a model with the periodical lump amplification by SLA [7].…”

“…It has been shown that solitary optical waves can propagate in cascaded optical communication systems with in-line semiconductor laser amplifiers (SLA) in spite of the noise generated in SLA [2]. If one neglects the noise, the preservation of solitary wave in such media can be explained on one hand with the presence of strong balance between the group velocity dispersion and nonlinearity, and on the other hand with the presence of the delicate balance between loses and nonlinear amplification.…”

“…It is well known that stationary solitary optical waves (SW) can be generated in dissipative nonlinear media with group velocity dispersion (GVD) and amplification [1][2][3][4][5][6][7]. It has been shown that solitary optical waves can propagate in cascaded optical communication systems with in-line semiconductor laser amplifiers (SLA) in spite of the noise generated in SLA [2].…”

The analysis of the error statistics in a 5 × 40 Gbit/s fibre link with hybrid amplification

“…This is an important example of patterning in optical channels [4], which in digital communication is seen as dependency of the single-bit error probability on the surrounding bits. As another example of the same, we cite the patterning effects caused by the saturation of a semiconductor optical amplifier gain (see [5,6]). In this paper we present one more system with nontrivial patterning effects: an SMF/DCF RZ-OOK WDM link with hybrid Raman/EDFA amplification at a channel rate of 40 Gbits/s.…”

Equivalent Circuit Models for Optical Amplifiers

“…They are very attractive for their wide gain spectrum, and capability of integration with other devices. In the linear regime, they can be used for both booster and in-line amplifiers (O'Mahony, 1988;Settembre et al, 1997;Simon, 1987). Also, much research activities have been done on all-optical signal processing with SOAs (Danielsen et al, 1998;Durhuus et al, 1996).…”