Dissertation > Excellent graduate degree dissertation topics show

Study on Key Technologies in Optical Label Switching Network

Author: ChenHongWei
Tutor: ZhouBingZuo
School: Tsinghua University
Course: Electronic Science and Technology
Keywords: optical label erasing vestigial sideband modulation polarization modulation optical label re-writing
CLC: TN929.1
Type: PhD thesis
Year: 2006
Downloads: 205
Quote: 0
Read: Download Dissertation

Abstract


Optical label switching (OLS) network inherits the soul of packet switching. The routing and switching information is embedded in the low speed label signal and it keeps the high speed all optical switching capacity, which is a promising solution for the future optical packet switching networks. Optical label processing methods and novel modulation formats are the key technologies in OLS network, which have attracted much attention.A novel Lyot-Sagnac polarization maintenance fiber loop filter is developed for erasing optical label in 10Gb/s subcarrier modulation (SCM) label format. This optical label eraser has the characters of double output ports, flatten transmission band, high extinction ratio and multi-channel operation. In this dissertation, the principle of the Lyot-Sagnac filter is analyzed theoretically and demonstrated experimentally.Two kinds of new modulation formats used in beyond 40Gb/s optical networks are proposed. One format combines the vestigial sideband payload and wavelength label. The feasibility and crosstalk between the payload and label are theoretically analyzed. Not only optical label adding and erasing methods of two wavelength labeling schemes are tested, but also 160km long distance transmission experiment is carried out. The results show that this format has the frequency efficiency up to 0.8bit/s/Hz. In this dissertation, the analytical results for vestigial filtering signals in conjunction with various modulation formats, e.g. NRZ, RZ, CSRZ, MDRZ, are derived, which also considering different pseudo-random bit sequences length. The performance of vestigial sideband CSRZ format employing two kinds of filters is experimentally demonstrated with meaningful results.The other high spectral efficiency modulation format is the orthogonal labeling scheme based on polarization modulation. This scheme utilizes the polarization states changes of payload to carry the label signal which avoidsthe extinction ratio limitation in the traditional orthogonal modulation. The polarization modulation is realized by only one LiNbO3 crystal phase modulator. The birefringence in the crystal causes imperfection polarization modulation with the input 40Gb/s pulses which can be eliminated by optical filtering method in this paper. Good performance is achieved through theoretical analysis as well as experiment verification. The novel orthogonal modulation format is analyzed and experimentally demonstrated by adding and erasing labels. At the same time, the polarization mode dispersion (PMD) and long distance transmission test are carried out. The results show that this format can be used in high speed optical label switching networks. A novel optical label re-writing scheme for this orthogonal format is given out. This scheme can omit the optical label erasing operation, simplify label processing and network node structure simultaneity.

Related Dissertations

  1. PPM Polarization Modulation in Atmosphere Laser Communication and Experiment Researsh,TN929.1
  2. Research on Modulation Technology of Satellite Communication,TN927.2
  3. High-resolution spectra of the hot atom and polarization modulation of four-wave mixing,O431.2
  4. Study on Polarization Dependence and Wideband Characteristics of Semiconductor Optical Amplifier,TN722
  5. ATSC 8-VSB demodulator LSI hardware implementation,TN763
  6. Wireless laser communication Polarization Modulation Systems,TN929.1
  7. Studies on Some Key Technologies in Optical Packet Switched Networks,TN929.1
  8. Studies on Optical Vestigial Sideband Modulation Formats and Key Techniques of OTDM System,TN929.1
  9. Technology Research and Realization of the Polar Calibration in 2.75G EDGE Systems,TN929.5
  10. Design and Implementation of Polarization Modulator and Demodulator for Quantum Communication System with Coherent States,TN915.05
  11. Synchronization Technique in Single-Carrier Digital Video Broadcast Transmission System,TN949.197
  12. Polarization Mode Dispersion Emulator、Experiments、Compensation and Preparatory Study on Modulation Code Formats,TN929.11
  13. Study on All-optical Wavelength Conversion,TN929.1
  14. The Study of OCDMA Encoders Based on Modulated Polarization,TN929.11
  15. Design of Multiplier for EDGE Polar Transmitter,TN832
  16. HDTV technology in the equalizer,TN949
  17. Dielectric oxide / GaN -based semiconductor heterostructures Electrical Properties,O649
  18. Study on Channel Allocation of Multi-Channel MAC Protocol in Ad-Hoc Network,TN929.5
  19. Research on UWB Location Technology Using UWB Radio Signal,TN929.5
  20. Design and Implement of Multi-Port Network Communication Platform,TN929.5
  21. Design and Realization of Digital Intermediate Frequency Transceiver Based on Software Defined Radio,TN929.5

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