Dissertation > Excellent graduate degree dissertation topics show

Design and Realization of Dynamic Dispersion Compensation Module Control Circuit Based on FPGA and ARM

Author: LiuXiangQuan
Tutor: FengDeJun；WeiZhenXing
School: Shandong University
Course: Electronics and Communication Engineering
Keywords: FPGA ARM dynamic dispersion compensation PWM
CLC: TN929.11
Type: Master's thesis
Year: 2011
Downloads: 46
Quote: 0
Read: Download Dissertation

Abstract


Optical signal transmitted in optical fiber in optical communication systems generally contains many different frequency components, additionally, in multi-mode fiber each frequency component may consist of several laser modes. Because velocity of optical travelling in optical fiber varies with frequencies and mode types, this results in spreading of the signal distortion or dispersion of light. Dispersion of light can lead to generation of inter-symbol interface which limits bandwidth and information capacity of optical fiber. Today 10G DWDM optical communication systems become increasingly popular and 40G DWDM technology is being adopted and promoted. Dispersion of light has gradually become a barrier to further improve the communication rate, so in order to improve system performance a growing number of DWDM systems introduce dispersion compensation management techniques and some of them adopt dynamic dispersion compensation technology which greatly improves system performance. However, these dispersion compensation technologies currently used still have several drawbacks such as complex of structure, unreliable and high cost etc.In order to solve the above questions, this paper introduces a kind of low cost, high performance dynamic dispersion compensation module which can achieve rapid dispersion compensation; it also introduces the design and realization of the high-performance driving circuit for the module. This dynamic dispersion compensation module is based on the G-T (Gires-Tournois) ETALON technology in optical structure design and its optical part is made by connecting several ETAOLN devices together. Because ETALON device’s dispersion curve relative to different wavelength varies with temperature changing, this can be used to compensate the dispersion of light travelling through it. As a single ETALON device’s dispersion curve relative to operating wavelength is nonlinear, in this module we connect several ETALON devices in series to realize a linear dispersion-wavelength curve. In every ETALON device a heating component is built in, which can be used to control the temperature of the device to meet specific dispersion curve. According to the required dispersion curve every device’s temperature can be accurately calculated out, if the devices are controlled to work at temperature combination calculated out, they will fit the required dispersion curve. By controlling the devices working at different temperature combinations the module can meet different dispersion curves, thus the purpose of tunable dispersion adjustment is achieved. In order to realize fast, accurate and dynamic dispersion compensation, a high performance multi-channel accurate temperature control circuit based on FPGA and ARM chips is designed and realized in this paper.The paper presents the design of control circuit which has two main parts:the ARM is designed as a master chip which controls FPGA working properly, communicates with server or host machine and processes commands; The FPGA internally configures a NIOS core and 16-channel 18-bit PWM module, the NIOS core controls multi-channel switches and a 24-bit ADC to gather temperature of the 16 ETALON devices and drives the 16-channel PWM signal to control the heat components in the devices based on PID close-loop control algorithm. Experiments show that temperature control stability of the driving circuit is better than±0.01℃and adjustment time between dispersion points nearby is less than 2 seconds, which all meet the design requirements.

Related Dissertations

  1. Model of Cylinder Controlled by On-Off Valve and System of PWM Control,TH138
  2. Research on Electromagnetic Acoustic Transducer Detection System Based on FPGA,TH878.2
  3. Study on the Control System for Automatic Aiming of HWIL Pitching Mechanism,TJ303
  4. The Electric Power Steering System,U463.4
  5. Study on Drive and Control System of Five-Phase PMSM Based on FPGA,TM341
  6. Development of LXI Arbitrary Waveform Generator,TM935
  7. Research on the Control Scheme of Hybrid PWM Rectifier under Unbalanced Voltage,TM461
  8. Grid-Side Converter Control and Wind Turbine Emulator in Direct Drive Wind Power System,TM46
  9. Design of Digital Predistorter for RF Power Amplifier Based on FPGA,TN722.75
  10. Synchronization and Channel Estimation Algorithm in Bursted OFDM System and Its Implementation on FPGA,TN919.3
  11. Performance Analysis of Anti-Multipath Capability in DSSS System and Study on the Compensation Methods,TN914.42
  12. Optimizing and Realising Research on Vedio Compression in TV Guidance System,TN919.81
  13. Research and Hardware Simulation of Multiuser Spread Spectrum Code Acquisition Based on FPGA,TN914.42
  14. Research on Basic Algorithms of Digital Image Processing and Implementation with FPGA,TP391.41
  15. Research of High Speed Image Pre-processing System Based on FPGA,TP391.41
  16. Development of Experimental Robot Control System Based on ARM,TP242.6
  17. Design of High-Speed Digital Image Acquisition and Interface Based on FPGA,TP274.2
  18. Development of Inductance Sensor Data Acquisition System Based on FPGA,TP274.2
  19. Data Collecting and Processing of Multi-Linear-CCD Visual Measuring System,TP274.2
  20. Research on Visual Servo System of Mechanical ARM,TP242.6
  21. Research on Software of TFT-LCD Testing Equipment Based on ARM,TN873.93

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Lightwave communications, laser communications > Optical fiber communication
© 2012 www.DissertationTopic.Net  Mobile