THE APPLICATION OF OPTISYSTEM IN OPTICAL FIBER COMMUNICATION EXPERIMENTS

Transcription

1 THE APPLICATION OF OPTISYSTEM IN OPTICAL FIBER COMMUNICATION EXPERIMENTS BIG PROJECT (TUBES) SISTEM KOMUNIKASI OPTIK LANJUT TT-36-G1 Oleh Grup 5 : ANDRIANUS FRANKY DEFRANDI RENANDA HARYADI KIRBI TIMUR NOMAS JORDI HASIANTA FAKULTAS TEKNIK ELEKTRO UNIVERSITAS TELKOM BANDUNG 2015

2 I.Introduction : Optical fiber communication technology stood out from the optical communication and has become one of the main pillars of modern communications. It plays an important role in modern telecommunications networks. Optical fiber communication as a new technology, in recent years, its rapid development and the broad range of application, are rare in the history of communications. It becomes the denotation of the new technological revolution in the world. As a main transmission of various information tools, it is of great importance in the future information society. Now, optical communication systems are becoming increasingly complex. These systems often include multiple signal channels, different topology structure, nonlinear devices and non-gaussian noise sources, which make their design and analysis quite complex and require high-intensity work. Optisystem will the design and analysis of these systems become quickly and efficiently. The traditional optical fiber communication experiments are usually conducted in the experimental box. The various components of optical devices in these boxes are encapsulated in comparison. So in the experiments, students often only do their work in accordance with the instructions on the experimental procedure step by step. It is difficult to understand the various parts of optical fiber communication system functions for the students and therefore, they lack the ability to create designs and fail to reach the effect required in the classroom instruction. When the OptiSystem software is introduced to the teaching of the experiments, it not only help the students to have a deep understanding of all parts of the optical fiber commu nication systems, but also have a clear visual impression on the optical fiber communication characteristics of the various components, which can give full play to its innovative design capabilities. II.Apparatus and Techniques : The parameter that will be simulate in here are WDM (wavelength division multiplexing) and optical fiber amplification base on EDFA(Erbium Doped Fiber Amplification) on optical fiber communication experiments using OptiSystem 7.0. Opti-System has powerful simulation environment and real components and systems of classification definitions. A fiber optic communication system model is based on the actual system-level simulator. Its performance can

3 be attached to the device user interface library and can be completely expanded to become a widely used tool. It has a huge database of active and passive components, including power, wavelength, loss and other related parameters. Parameters allow the user to scan and optimization of device-specific technical parameters on the system performance. The tool that we ve use here is OptiSystem version 7. We use this tool to simulate WDM (Wavelength Division Multiplexing) communication over fiber optics. The basic principle of the WDM is that the light signals with different wavelengths is put together at first, and then coupled to fiber optic cable lines in the same fibers for transmission. The system has 4 laser sources, WDM Mux and Demux and five optical spectrum analyzer. We set the light source composed of four lasers with emission frequency 193.1THz, THz, THz, and THz respectively. And for the second experiment, we made optical fiber amplification with Erbium Doped Fiber. It consist of 1 Laser source, 1 pump laser, a multiplexer, 3 optical spectrum analyzer and a dual port WDM analyzer.

4 Project Time line : Time Line Project Date Research Refferences 5 November 2015 Installation Optisystem 18 November 2015 Design &Simulation 26 November 2015 III. Results and Discussion : This our architecture of WDM on Optical Communication system in Optisystem 7.0 Figure 3 WDM system diagram Each spectrum analyzer can be showed four CW laser with emission frequency THz, THz, 193.7Thz, 194 THz. The light signals from the four lasers are put together through the

5 WDM combine, and then coupled into the optical fiber. At last, the signal wavelength demultiplexer separates the combined signal in the terminal which is represented by optical spectrum analyzer. Figure 3.1 shows the frequency spectrum for the WDM signals after the combined. After demultiplexing the frequency of each channel is shown in figure 3.2 Figure 3.1 Multiplexed signal spectrum after mux

6 Figure 3.2 The channel spectrum analysis chart after demultiplexing The simulation results show the system implements the functions of WDMA systems. In actual experiments which they do of WDMA systems, the channel experiments what my group got, multiplexed signal spectrum for 4 channel, we got the same result of the table but only different for the minimum power, and for after demuiltiplexing we got the same result for 4 table. Each spectrum for THz, THz, THz, and 194 THz they will appear for their frequency self, it can be see in figure 3.2. when process multiplexed signal spectrum, we design for specifications CW laser and multiplexer with different point so we got the different result for the paper yet. In that paper they didn t entry the point like power, distance (optic cable), and bandwidth. So my group just try to get the same results with the paper, so that s why the result different from the power. We think for this experiments my group success for the simulation. Simulation of optical fiber amplification experiment The application of optical amplifiers in communication is a major breakthrough in the history of optical fiber communication technology. It replaces the traditional electronic relay station and makes the dream of all-optical communication becomes a reality, in which erbium- doped laser amplifiers has the fastest development. Figure 3.3 is an optical amplifier system based on EDFA, which is designed with Optisystem. The signal and pump light are combined together through the ideal MUX. Then they enter into the erbium-doped fiber amplifier. By comparing the spectrums of light changes before and after amplified, we can observe the amplification effect. Connect the system according to Figure 3.3 and run the simulation. The center wavelength of the signal light and pump light used here are 1550 nm and 980 nm respectively. The signal spectrums of the optical before and after amplified are shown in figure 3.4 and 3.5 respectively. From this figure, we can see that the intensity of the signal is significant enlarged. Moreover, optical signal spectrum before and after amplified has similar shape. This means that this system has achieved the purpose of optical amplification.

7 3.3 Optisystem optical amplification system chart Figure 3.4 (a) signal spectrum before amlified

8 Figure 3.4 (b) signal spectrum after amplified Figure 3.4 The signals spectrum of the optical before and after amplified Comparing the two graphs, it can be clearly seen that the value of intensity has been increased without reshape the optical signal spectrum after amplified, this proves that system has achieved the function of optical amplification technology. IV. Conclusion : Using Optisystem software, it is beneficial to train the abilities of students, such as independent analysis, design and ability to solve practical problems. Moreover, it helps to enable students the ability of connecting theory with practice, finding some problems in the experiment, grasping the soul of theoretical knowledge. Optisystem provides a flexible platform for virtual experiments which help students to grasp the more abstract principle of optical fiber communication systems.

9 REFERENCES 1. Sun Qiang, Zhou Xu. Optical fiber communication system and its applications, Beijing: The Press of Tsinghua University, Shi Shunxiang, Chen Guo Fu, Zhao Wei et al.. Nonlinear optics, Xi an: The Press of Xidian University, Automation net OptiSystem software for the design of optical communication system, 4. Liu Zengji, Zhou Yang Yi, Hu Liaolin. The optic fiber communication, Xi an: The Press of Xidian University, Zhang Baofu, Tan Xiao, Jiang Huijuan. The principle and experiment lectures of optic fiber communication system, Beiing: The Press of Electronics Industry, Zhang Mingde, Sun Xiaohan. The principle and system of optical communication, Nanjing: The Press of Southeast University, Wang Jingshan, Shen Xinjie, Sun Wei. The optical fiber communication devices, Beijing: The Press of Defense Industry, 2003.