With the evolvement of high speed and long-distance data communication systems, conventional band erbium-doped fiber amplifiers (C-EDFAs) are getting more attention in recent times. Major advantage of the C-band EDFA is that it provides the user to realize a system with wide bandwidth of 40 nm. But, from the reported works, it is evident that for Gain enhancement in C-band using EDFA is reported with the use of multiple stages, multiple pumps, Gain flattening filters etc. However, these techniques suffered from high cost, complex techniques, and low performance. Here enhancement process was done through the narrowband Fiber Bragg Gratings (FBG) or fiber reflectors mirrors.
In this work, a conventional band erbium doped fiber amplifier is proposed with high gain and less noise figure by incorporating the two fiber bragg gratings (FBGs) for amplified spontaneous noise reinjection. Maximum ASE is emerged at 1565 nm for the at -55 dBm carrier powers. Maximum gain is found out to be 48.16 dB with noise figure of 5.29 dBm.
Fiber amplifiers are crucial and fast-growing field in the communication system. The study of this field show that the formulation procedures of lasers generation and amplifier amplification displays a problematical process due to the factors affecting and changing amplifier and laser significances in a dynamic way. Gain, noise figure, wavelength, power flatness and power output are directly affected by any element or parameter inside the amplifier configuration. The design parameters such as: erbium ions concentration, EDF length, isolators, wavelength division multiplexing (WDM) position, pump power position, circulators, pump directions, all of these elements and factors are affecting directly the amplifier output. EDFA is an amplifier that is best used because of its low loss and high gain. For communication, there are two windows 1530-1560nm(C-band) and 1560-1610nm (L-band).
Table of Contents
1 Introduction
1.1 Introduction and Motivation
1.1.1 Advantages of Optical Fiber Communication
1.1.2 Optical Fiber Communication
1.2 Development of Multiplexing Techniques
1.2.1 Introduction of Multiplexing
1.2.2 Need of Multiplexing
1.2.3 Principle of Multiplexing
1.2.4 Types Of Multiplexing Techniques
(a)Time Division Multiplexing (TDM)
(b)Wavelength Division Multiplexing (WDM)
(c)Frequency Multiplexing (FDM)
1.3 Fiber Optic Nonlinear Effects
1.4 Introduction of Optical Amplifiers
1.4.1 Principle of Optical Amplifier
1.4.2 Amplifier Types
1.4.3 Semiconductor Optical Amplifier
1.4.4 Erbium Doped Fiber Amplifier
1.4.5 Motivation
1.4.6 Development Of L-Band EDFA Amplifier
1.4.7 Raman Amplifier
1.5 Comparison Between Optical Amplifiers
1.6 Need of Study
1.7 Scope of Dissertation
1.8 Structure of Dissertation
2 Literature Survey
3 Research Gaps
3.1 Problem Formulation
3.2 Research Objectives
3.3 Research Methodology
4 Proposed Work
4.1 To Evaluate The C-Band Single Stage EDFA ASE Reinjection System with Single Pump
4.2 Introduction
4.3 System Setup
5 Result and Discussion
5.1 Effect of Different Physical Parameters of Edf on C-Band Edfa
5.2 Comparison of Proposed Work with Base Paper
6 Conclusion and Future Scope
6.1 Conclusion
6.2 Future Scope
Objectives and Core Topics
This dissertation aims to enhance the gain of C-band Erbium Doped Fiber Amplifiers (EDFA) by implementing an Amplified Spontaneous Emission (ASE) reinjection technique using Fiber Bragg Gratings (FBGs) to improve performance while reducing system cost and complexity.
- Gain enhancement in C-band fiber optic communication systems.
- Utilization of ASE reinjection via Fiber Bragg Gratings.
- Performance optimization of physical parameters such as pump power and input power.
- Comparative analysis of the proposed single-stage EDFA system against conventional multi-stage configurations.
- Reduction of overall system cost by eliminating multiple pumps and complex modules.
Excerpt from the Book
4.1.2 System setup
In this work, a single pumped C band erbium doped fiber amplifiers is proposed using two fiber Bragg gratings with amplified spontaneous reinjection as depicted in Figure 4.1. Speed of the operation is fixed to 10 Gbps from binary data bits generator. A continuous wave laser at -55 dBm power is incorporated in the system which is acting as C-band source. Laser signal is passed through optical isolator to prevent optical source from the back flowing optical intensity due to ASE. Laser signal fed to optical co-propagating pump coupler at 1490 nm wavelength is also coupled to this module.
Here, FBG 1 is acting as the reflector of backscattered ASE signal at 1565 nm and combined with pump . We have chosen the 1565 nm wavelength to be reflected because of maximum intensity at this point. An erbium doped fiber with 200 ms metastable lifetime is taken. Various physical parameters are varied such as input power, and pump power. Simulation parameters are shown in Table 4.1 to clear the factors that are considered for the proposed work.
FBG 2 is employed to reflect the forward scattered amplified spontaneous noise. Finally signal passed through the isolator and gain of signal is accessed by dual port WDM analyzer.
Summary of Chapters
Chapter 1: Provides a fundamental overview of optical fiber communication systems, multiplexing techniques, and the general operating principles of various optical amplifiers.
Chapter 2: Reviews existing literature regarding optical amplifier configurations, specifically focusing on gain optimization studies and previous hybrid amplifier research.
Chapter 3: Formulates the research problem by identifying limitations in current C-band EDFA systems, such as high cost and complexity, and outlines the research objectives and methodology.
Chapter 4: Details the proposed simulation setup of a C-band single-stage EDFA using ASE reinjection through Fiber Bragg Gratings to achieve high gain.
Chapter 5: Presents the simulation results, analyzing the effect of physical parameters on gain and noise figure, and compares the findings with the baseline research.
Chapter 6: Concludes the dissertation by summarizing the optimal parameters found for gain enhancement and suggests future improvements like extending to WDM systems and higher data rates.
Keywords
Erbium Doped Fiber Amplifier, EDFA, C-band, ASE Reinjection, Fiber Bragg Gratings, FBG, Optical Communication, Gain Enhancement, Noise Figure, Wavelength Division Multiplexing, WDM, Optical Fiber, Signal Amplification, Simulation, Pump Power
Frequently Asked Questions
What is the primary focus of this research?
The research focuses on enhancing the gain of C-band Erbium Doped Fiber Amplifiers (EDFA) using an ASE reinjection technique to improve system performance.
What are the central themes of the dissertation?
The central themes include optical fiber transmission, amplification processes, the mitigation of amplified spontaneous emission noise, and cost-effective design configurations.
What is the core research objective?
The main objective is to design a high-gain, single-stage C-band EDFA that utilizes Fiber Bragg Gratings to reinject ASE, thereby minimizing the need for multiple pumps and complex stages.
Which methodology is employed in this study?
The study utilizes numerical simulations via the Optiwave Optisystem software package to model the proposed EDFA system and analyze gain and noise figure metrics.
What does the main body of the work cover?
The main body covers the theoretical background of optical amplifiers, a literature review of relevant prior research, a detailed description of the proposed simulation setup, and a comprehensive analysis of simulation results.
Which keywords characterize this work?
Key terms include EDFA, ASE reinjection, Fiber Bragg Gratings, gain enhancement, C-band, and optical fiber communication.
How does ASE reinjection contribute to system performance?
ASE reinjection recycles the amplified spontaneous emission noise back into the fiber, which helps in boosting the signal gain and optimizing the overall amplifier efficiency.
What specific advantage does the proposed work offer compared to the base paper?
The proposed work achieves a higher gain of 48.16 dB using only a single stage and single pump, whereas the base paper required multiple stages and pumps at a higher cost.
- Citar trabajo
- Mohammad Yusuf (Autor), 2019, Fiber Optics Communication. Gain Enhancement of Erbium Doped Fiber Amplifier using Amplified Spontaneous Emission, Múnich, GRIN Verlag, https://www.grin.com/document/920982
