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Highlights in Science Engineering and Technology

Modeling and numerical simulation of the gain of a 1310nm praseodymium-doped fiber amplifier

Zhiwen Chen, Keyi Hao, Tingting Xiao

Published Dec 27, 2022• 1 citation
Publisher

Abstract

Optical fiber communication is of great importance in information transmission. Increasing the transmission capacity of optical fiber systems is a solution to meet the increasing demand for information, in which rare earth ion-doped fiber amplifiers play an important role. In this paper, the quasi-quadruple-energy structure of is equated and simplified to a conventional triple-energy structure to improve amplification's efficiency and significance. By exploring the influence of many factors on the praseodymium-doped fiber amplifier, the amplification band with gain window between 1250-1350nm is verified, and the amplification of the central wavelength of 1310nm is realized. It provides a theoretical reference for the subsequent application of praseodymium-doped fiber amplifiers in communication engineering, laser amplification and other fields. Since the amplification band of praseodymium-doped fiber amplifier matches the zero dispersion point of 6.652 optical fiber, it will have a huge application market in the 1310nm optical communication system.

DOI
10.54097/hset.v27i.3749

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Optical fiber communication is of great importance in information transmission. Increasing the transmission capacity of optical fiber systems is a solution to meet the increasing demand for information, in which rare earth ion-doped fiber amplifiers play an important role. In this paper, the quasi-quadruple-energy structure of is equated and simplified to a conventional triple-energy structure to improve amplification's efficiency and significance. By exploring the influence of many factors on the praseodymium-doped fiber amplifier, the amplification band with gain window between 1250-1350nm is verified, and the amplification of the central wavelength of 1310nm is realized. It provides a theoretical reference for the subsequent application of praseodymium-doped fiber amplifiers in communication engineering, laser amplification and other fields. Since the amplification band of praseodymium-doped fiber amplifier matches the zero dispersion point of 6.652 optical fiber, it will have a huge application market in the 1310nm optical communication system.
A complete experimental and theoretical study of rare earth doped fiber-optic amplifiers for the first tele-communication window has been made. The thulium doped fluoride fiber amplifier is shown to provide amplification in the 800nm-820nm signal region. A complete steady state theoretical model has been presented and the model has been experimentally verified. The model predicts the gain, noise figure and the amplified spontaneous emission in the 800nm, 1470nm, 1900nm and 2300nm bands. The effect of population trapping at the sp3Fsb4\\sp3F\\sb4sp3Fsb4 energy level of thulium ion is also shown with the help of the model. It has been shown that about 5-15%o of the population is trapped at the sp3Fsb4\\sp3F\\sb4sp3Fsb4 energy level. We have also shown theoretically, the expected gain and noise performance of Thulium doped fluoride fiber amplifiers pumped in the 680nm absorption band. The maximum gain at 806nm is slightly lower than with comparable 780 nm pumping. The gain bandwidth is however found to increase with 680nm pumping. The higher ASE at shorter wavelengths ($<$806nm) reduces the gain at the peak wavelength (806nm). This is a result of the better inversion with three level pumping at 680nm as compared to two level resonant pumping at 780nm. We report an efficient single mode erbium doped flouride fiber amplifier in the 850nm signal band for the first time. The amplification is through an up-conversion process. The erbium doped flouride fiber amplifier was pumped with an estimated pump power of 35mW at 792nm. We have also considered a theoretical model for a single mode erbium doped fluoride fiber amplifier. Efficient amplification occurs because of the strong excited state absorption at the pump wavelength from the sp4Isb13/2\\sp4I\\sb{13/2}sp4Isb13/2 energy level.
Rare earth doped fibre amplifiers for the 1300nm and 1550nm communication windows are analysed in regard to their performance limitations and potential for telecommunications applications. Erbium doped fibre amplifiers in the 1550nm window have been very successful, and efficient, high gain, low noise devices with pump power requirements of tens of mW have bean demonstrated. For the 1300nm window both Neodynium and Praseodymium are potential candidates for doped fibre amplifiers. However these devices are inherently much less efficient, due to the short metastable level lifetimes in these rare-earth Ions.
Abstract With the continuous evolution of communication technology, and the rapid rise of fiber optic communication in China However, the transmission distance of fiber optic communication is limited due to its fiber loss, so fiber optic amplifier has become one of the key research topics today. Currently on the market is a large-scale commercial bait-doped fiber amplifier, although it has the advantage of low noise and high gain, its effective amplification band is only concentrated in 1530 nm-1620 nm, however, there are many important transmission band amplification there are still research gaps. As a result, the focus of this paper’s research is on optimizing the gain spectrum of a bismuth-doped fiber amplifier at wavelengths between 1200 and 1600 nm using modelling and numerical simulation. The research method of this paper is as follows: first of all, after the literature survey, this topic is using the three-energy level structure, and then collecting the data of pump light wavelength and emission absorption cross-section, signal light emission, and absorption cross-section. fit the data to the graph line, and call the genetic optimization algorithm to derive the gain spectrum optimal value. It’s found that when the pump light wavelength is 1230 nm, fiber length is 2 m, bismuth ion doping concentration is 10.0×1024 ions/m3, the signal light wavelength is 1330 m, its amplifier gain spectrum reaches a peak of 57.17 dB, which is consistent with the results of the three-layer cycle (manual search).
Fiber optic amplifiers will improve the power of signals propagating in optical fibers, usually using doped ions as amplifiers. The bismuth-doped fiber amplifier can amplify the current E-band signal light, which is less used, and provide a solution to enhance the communication transmission capacity.In this essay, Matlab is used as a research tool, and the bismuth-doped fiber amplifier is selected, and the energy level system is a three-energy levelThe 830 nm-wavelength pumping source amplifies the signal light at 1390 nm. The bismuth-ion velocity and power amplification propagation equations are established, and the amplified spontaneous radiated optical power is calculated. Amplified spontaneous radiation optical power, and through the calculation and simulated annealing algorithm to derive the amplified spontaneous radiation optical power amplification with the doping concentration and fiber length spectrum, in the fiber length of 3.3m and the number of doped particles of 9.1 * 10^25 to obtain the maximum optical power of 7.95*10^-9W.
We present the schematic representations for teaching the procedure of optical amplification in erbium and praseodymium doped fiber amplifiers by using rate equations models. The behaviour of these types of amplifiers is the same as three (for erbium ion) and four (for praseodymium ion) levels atomic systems, respectively. Most of the important characteristics of these amplifiers can be obtained from these simple models and their underlying assumptions. Hence, we can make use of these approaches for teaching the purposes of procedures in fiber amplifiers. For this aim, the gain performances of Er3+ and Pr3+-doped fiber amplifiers are investigated at the educational level, using the temperature-dependent rate equation model.