scholarly journals Erbium - doped fiber laser systems: Routes to chaos

2014 ◽  
Vol 11 (4) ◽  
pp. 551-563
Author(s):  
Vesna Rubezic ◽  
Ana Jovanovic
Keyword(s):  
Fiber Laser ◽  
Chaotic Behavior ◽  
Laser System ◽  
Period Doubling ◽  
Optical Modulator ◽  
Dynamical Behaviors ◽  
Electro Optical Modulator ◽  
Erbium Doped ◽  
Laser Systems ◽  
The Time Domain

Erbium-doped fiber laser systems exhibit a large variety of complex dynamical behaviors, bifurcations and attractors. In this paper, the chaotic behavior which can be achieved under certain conditions in a laser system with erbium-doped fiber, is discussed. The chaos in this system occurs through several standard scenarios. In this paper, the simulation sequence of quasiperiodic, intermittent and period-doubling scenario transitions to chaos is shown. Quasiperiodic and intermittent transitions to chaos are shown on the example system with a single ring. The electro-optical modulator was applied to the system for modulating the loss in the cavity. We used the sinusoidal and rectangular signals for modulation. Generation of chaos is achieved by changing the parameters of signal for modulation. Period-doubling transition to chaos is illustrated in a system with two rings. Simulation results are shown in the time domain and phase space.

scholarly journals Study of Chaos Control of a Dual-Ring Erbium-Doped Fiber Laser Using Parameter Method

2018 ◽  
Vol 0 (0) ◽  
Author(s):  
Yan Senlin
Keyword(s):  
Fiber Laser ◽  
Chaos Control ◽  
Chaotic Behavior ◽  
Single Parameter ◽  
Parameter Method ◽  
Period 2 ◽  
Periodic State ◽  
Erbium Doped ◽  
Different Levels ◽  
Dual Ring

AbstractThis paper aims to study single-parameter and dual-parameter chaos control of a dual-ring erbium-doped fiber laser. We present the control model to pressure chaotic behavior of the laser to a periodic state or multi-periodic states by introducing a periodic mutational signal to adjust the losses of dual ring. When the loss of single ring is shifted between two different levels, the laser behaviors can be deduced to two single-period states, while two rings can emit cyclic pulses. We find a control-locking regime and discuss its frequency characteristic of the laser. When another signal is taken to control to perform on the loss, the laser can be deduced to show a period-2 state, a period-3 state, period-4 state and other multi-periodic states. And we find dual-dynamic controlled regimes, in which, one ring of the laser can be produced to show a periodic state while another ring presents a period-3 state. We find also a dual-period regime or a period-4 regime. When both the losses of dual ring are adjusted by shifting between different levels, the laser can produce a period-4, a period-6 and other multi-periodic states. The result indicates that chaos control of a dual-ring erbium-doped fiber laser can be realized using the single-parameter and dual-parameter methods.

scholarly journals Clinical feasibility trial on 1940 nm Tm: fiber laser intervention of hyperplastic inferior nasal turbinates

2012 ◽  
Vol 1 (3) ◽  
Author(s):  
Ronald Sroka ◽  
Miriam Havel ◽  
Christian Betz ◽  
Thomas Kremser ◽  
Andreas Leunig
Keyword(s):  
Fiber Laser ◽  
Laser System ◽  
Operation Time ◽  
Endoscopic Examination ◽  
Feasibility Trial ◽  
Nasal Breathing ◽  
Contact Mode ◽  
Endoscopic Control ◽  
Validated Questionnaire ◽  
Laser Systems

AbstractA number of different laser systems have been used for volume reduction of hyperplastic nasal turbinates. In case of endonasal application, fiber-controlled diode lasers are preferred due to reasons of cost and practicability. The aim of this clinical feasibility study was to show the coagulative and tissue reducing effects using a novel Tm: fiber laser system emitting at λ=1940 nm.This clinical feasibility trial included 11 patients suffering from hyperplastic inferior nasal turbinates, who were therapy-refractory to conservative medical treatment. The obstructive nasal cavity was treated using the 1940 nm Tm: fiber laser at <5 W output power. The treatment was performed in non-contact mode under endoscopic control. Patients’ symptoms were documented both preoperatively and on days 1–3 and 28 postoperatively using a non-validated questionnaire. Additionally, an endoscopic examination was performed.None of the patients showed infections, and no hemorrhages or other complications occurred intra- or postoperatively. The mean laser activation time during the surgical procedure was extremely short being 28.0±8.5 s. In conjunction with a low power setting (median, 3 W; mean±standard deviation, 3.3±1.1 W), a low energy of 90.2±37.8 J was applied. A significant reduction in nasal obstruction could be documented in all patients on day 28 postoperatively. Evaluation, as assessed preoperatively and 4 weeks postoperatively, showed significant subjective improvements.The treatment of hyperplastic inferior turbinates using a 1940 nm Tm: fiber laser provides sufficient tissue reduction in a short operation time using low total energy. Patients described a significant improvement in nasal breathing postoperatively.

Effect of Attenuation on Four-Wave Mixing Generation

2011 ◽  
Vol 378-379 ◽  
pp. 748-751
Author(s):  
M.A. Nizam ◽  
N. Arsad ◽  
Hanim Abdul Razak ◽  
S. Shaari ◽  
A.E. Annuar ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Fiber Laser ◽  
Laser System ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Lasing Wavelength ◽  
Crystal Fiber ◽  
Variable Optical Attenuator ◽  
Erbium Doped

Four-wave mixing (FWM) phenomenon can be produced by using a different refractive index of the optical fiber in an erbium doped fiber laser system. In our study, we used a 20 meter length of Photonics crystal fiber (PCF) to generate multiwavelength signals. Variable optical attenuator is employed in the setup to study its effect on the output signals. Results show that uniform signals were obtained by using the VOA to suppress other modes of wavelengths which occurred before placing the VOA. New lasing wavelength at 1530.445 nm, 1531.450 nm, 1531.960 and 1532.415 nm were produced uniformly.

Period-doubling of dispersion-managed solitons in an Erbium-doped fiber laser at around zero dispersion

2007 ◽  
Vol 278 (2) ◽  
pp. 428-433 ◽  
Author(s):  
L.M. Zhao ◽  
D.Y. Tang ◽  
T.H. Cheng ◽  
H.Y. Tam ◽  
C. Lu ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Period Doubling ◽  
Erbium Doped

Chaos synchronization characteristics in erbium-doped fiber laser systems

2003 ◽  
Vol 217 (1-6) ◽  
pp. 415-420 ◽  
Author(s):  
Y. Imai ◽  
H. Murakawa ◽  
T. Imoto
Keyword(s):  
Fiber Laser ◽  
Chaos Synchronization ◽  
Erbium Doped ◽  
Laser Systems

scholarly journals Stability and Bifurcation Analysis of a Discrete Singular Bioeconomic System

2021 ◽  
Vol 2021 ◽  
pp. 1-22
Author(s):  
Qamar Din ◽  
A. M. Yousef ◽  
A. A. Elsadany
Keyword(s):  
Bifurcation Analysis ◽  
Control Method ◽  
Chaotic Behavior ◽  
Period Doubling ◽  
Differential Algebraic Equations ◽  
Delayed Feedback Control ◽  
Main Concern ◽  
Dynamical Behaviors ◽  
Stability And Bifurcation ◽  
Stability And Bifurcation Analysis

The main concern of this paper is to discuss stability and bifurcation analysis for a class of discrete predator-prey interaction with Holling type II functional response and harvesting effort. Firstly, we establish a discrete singular bioeconomic system, which is based on the discretization of a system of differential algebraic equations. It is shown that the discretized system exhibits much richer dynamical behaviors than its corresponding continuous counterpart. Our investigation reveals that, in the discretized system, two types of bifurcations (i.e., period-doubling and Neimark–Sacker bifurcations) can be studied; however, the dynamics of the continuous model includes only Hopf bifurcation. Moreover, the state delayed feedback control method is implemented for controlling the chaotic behavior of the bioeconomic model. Numerical simulations are presented to illustrate the theoretical analysis. The maximal Lyapunov exponents (MLE) are computed numerically to ensure further dynamical behaviors and complexity of the model.

scholarly journals Phase-locked two-branch erbium-doped fiber laser system for long-term precision measurements of optical frequencies

2004 ◽  
Vol 12 (24) ◽  
pp. 5872 ◽  
Author(s):  
Florian Adler ◽  
Konstantinos Moutzouris ◽  
Alfred Leitenstorfer ◽  
Harald Schnatz ◽  
Burghard Lipphardt ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Laser System ◽  
Precision Measurements ◽  
Erbium Doped
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