Generating dark solitons through cross-phase modulation in optical fibers (original) (raw)

Dark-soliton generation in optical fibers

Optics Letters, 1989

We study the generation of dark-pulse solitons in nonlinear-optical fibers in the normal dispersion regime. We demonstrate that dark solitons may be created as pairs by an arbitrary dark pulse without a threshold and obtain the parameters of the generated solitons. The cases of soliton creation by a boxlike dark pulse and a random Gaussian pulse are also described.

Dark solitons produced by phase steps in nonlinear optical fibers

Optics Communications, 1990

We demonstrate analytically that dark solitons may be produced from phase steps in nonlinear optical fibers at the positive group velocity dispersion. We study the cases of a step and two steps in the phase ofa cw background in detail. The parameters of generated solitons are calculated. The influence of the background broadening and dissipative losses on the dark-pulse evolution is discussed too.

Dark optical solitons with finite-width background pulses

JOSA B, 1989

Using numerical solutions of the nonlinear Schrodinger equation, we show that for positive group-velocity dispersion, optical dark pulses superimposed upon background pulses only -10X wider can exhibit stable soliton propagation in single-mode fibers. During propagation the background pulse spreads (which reduces its intensity) and develops a frequency chirp. Nevertheless, as the background pulse evolves the dark pulse adiabatically maintains its soliton characteristics. These numerical results are in excellent agreement with recent experimental investigations of dark-pulse propagation in fibers.

Generation of vector dark-soliton trains by induced modulational instability in a highly birefringent fiber

Journal of the Optical Society of America B, 1999

We present a set of experimental observations that demonstrate the generation of vector trains of dark-soliton pulses in the orthogonal axes of a highly birefringent optical fiber. We generated dark-soliton trains with terahertz repetition rate in the normal group-velocity dispersion regime by inducing a polarization modulational instability by mixing two intense, orthogonal continuous laser beams. Numerical solutions of the propagation equations were used to optimize the emission of vector dark pulses at the fiber output.

Fiber Bragg grating for optical dark soliton generation

IEEE Photonics Technology Letters, 2000

We investigate theoretically and experimentally the generation of dark soliton pulse trains at several gigahertz repetition rate by means of a fiber Bragg grating used as a passive filtering element at the output of a mode-locked laser. We show that a proper choice of the grating parameters allows for the transformation of bright pulse train into odd dark pulse trains with continuous-wave (CW) background.

The Optical Soliton Propagation in Nonlinear Dispersive Fiber

International Journal of Computing and Digital Systemss

The establishment of the optical fiber has transformed media transmission systems all over the world, empowering an extraordinary measure of data transmission, all at the speed of light. One of the most important achievements of the following optics development will be the utilization of solitons of optics in optical fibre communication. The uncommon sort of optical signals is soliton that can spread through an optical fiber accurate for long transmission distances. A quick advance for the period of the 1990s has changed over optical solitons into a reasonable contestant for current light wave system. In this paper, a short outline of the improvement of non-direct optics and optical solitons is given. The reason for this paper is to give a thought regarding the impacts of the two modulation processes which are four waves mixing FWM and cross phase modulation XPM going with the spread of the pulses at various carrier frequencies. Furthermore, we tentatively show soliton spread in the basic transmission remove for optical fiber and more complicated trend conduct in a higher transmission distance, showing that the effect of optical fiber length contracts for each mode.

The Evolution and perturbation of Solitons in DispersiveNonlinear Optical Fiber

IOSR Journal of Electronics and Communication Engineering, 2014

A system of coupled nonlinear Schrodinger (NLSEs) of two fundamental and dark solitons are numerically investigated by Split-Step Fourier Method (SSFM) simulation. The stability of the evolved 'bright' envelopes as the superimposed of two dark solitons has been compared with the interaction of bright fundamental solitons in the perturbed or lossy fiber. Dynamic nature of the solitons in the the presence of nonlinear-dispersive phenomena, their relative amplitude i r relative phase i  and their separation distance 0 q (0 r) are evaluated in the simulation.

Observation of incoherently coupled dark-bright vector solitons in single-mode fibers

Optics Express, 2019

We report experimental observation of incoherently coupled dark-bright vector solitons in single-mode fibers. Properties of the vector solitons accord well with those predicted by the respective systems of incoherently coupled nonlinear Schrödinger equations. To our knowledge, this is the first experimental observation of temporal incoherently coupled dark-bright solitons in single mode fibers.

Optical Solitons in Fiber Optic Communications

An overview of optical solitons was presented in this project. Starting from the nonlinear effects on the refractive index and the wave equation, the Nonlinear Schrodinger Equation (NLSE) was developed. The NLSE is capable of describing both temporal and spatial solitons of both the bright and dark types. The solutions to these NLSE were also given, and their physical properties were explored. The crux of soliton theory is that the 𝛽2 linear dispersive effects (GVD or diffraction) can be balanced by intensity dependent nonlinear effects, creating a field that does not change in shape as it propagates. This places a defining condition between the pulse width and amplitude. Simulation results of soliton propagation through a dispersive fiber were presented, and it was found that the exact initial conditions of a soliton do not have to be matched, since solitons are self-adjusting. The implementation of optical solitons for fiber optic communications were studied, and the relations between bit-rate, transmission distance, and pulse widths in a typical setup were determined. There are several challenges in the implementation, the most important is power loss in the fiber, which causes an exponential broadening of pulse width during propagation. Finally, a brief description of previous experimental results on soliton transmission in fiber optic communications was presented.