Dissertation > Excellent graduate degree dissertation topics show

Pump Hysteresis and Wavelength Tuning in Passively Mode-locked Er3+-doped Fiber Laser

Author: ZhangHua
Tutor: FuXiQuan
School: Hunan University
Course: Communication and Information System
Keywords: fiber laser nonlinear polarization rotation passive mode-locking pump power hysteresis amplifing spontaneous radiation
CLC: TN248
Type: Master's thesis
Year: 2009
Downloads: 108
Quote: 0
Read: Download Dissertation

Abstract


Fiber communication technology play an very important role in the process of informationization of socialty due to its high speed and huge capacity. The fiber laser based on nonlinear polarization rotation technique draw lots of attention because of its potential purpose in the fiber communication system such as DWDM, OTDM as an economical, steady fiber source. Pump power hysteresis affects the stabilization of the repetition rate of a fiber laser based on nonlinear polarization rotation technique, and the importance of characteristic of wavelength tuning is distinct when fiber laser apply to communication optical source. The article has analysized the mechanism of the pump power hysteresis and wavelength tuning theoretically and experimentally, and validate the analysis result of the pump power hysteresis in simulation. The main research results are listed below:Firstly, The mechanism of the pump power hysteresis effect is analyzed by the nonlinear transmission model. It is found that the pump hysteresis arises from the nonlinear loss property of the laser cavity and the hysteresis becomes larger as the number of the solitons increases. Both simulation and experimental results confirm the analytical conclusion, and clearly demonstrate that not only the soliton operation of the laser, but also the generation and annihilation of each individual soliton in the laser exhibit the pump power hysteresis.Secondly, the mechanism of wavelength tuning is analyzed theoretically and experimentally. Experimentally, while disconnecting isolator and increaseing the pump power to 325mw we find the central wavelength of spontaneous radiation spectrum of the fiber is 1532nm. And then, the isolator is connected and the pump power is stabilized to 325mw, the power of long wavelength increase and the laser come into dual-wavelength state after tuning polarization controller. Continuing tuning polarization controller, the laser come into soliton state and the central wavelength of soliton spectrum is 1558nm. Besides, it can be tuned between 1558nm and 1570nm simplly tuning polarization controller. At last, analyzing the mechanism of wavelength tuning with nonlinear transmission mode, the research result indicate that the mechanism of wavelength tuning arise from the combination of fiber birefraction, fiber non-linearity and cavity filter.

Related Dissertations

  1. Thulium-doped Fiber Laser Technology,TN248
  2. Study on the Laser Characteristic of Tm3+-doped Double-cladding Fiber,TN248
  3. Research of Spectral Beam Combining Technology for High Power Fiber Lasers,TN248
  4. Research of MOPA-frame 1550nm Passively Mode-locked Fiber Laser,TN248
  5. Study on Ultra-short Optical Pulse Generation,TN929.11
  6. Research on the Tunable Fabry-Perot Filter and Its Laser Application,TN713
  7. Theoretical Analysis and Application of Special Fiber Bragg Gratings,TN253
  8. Theoretical and Experimental Research on Erbium-doped Fiber Ring Laser Applied to Gas Sensor,TN248
  9. All-optical analog-digital conversion of basic research in the quantitative techniques,TN792
  10. Erbium-Doped Fiber Laser for Applications of Acetylene Gas Detection,TP274.5
  11. Research of the Narrow Line-Width Erbium-Doped Fiber Laser and Its Sensing Properties,TN248
  12. Study of Pulse Tunable Fiber Laser,TN248
  13. Study on Narrow-linewidth Yb-doped Fiber Laser,TN248
  14. Numerical and Experimental Study on Coherent Combining of Double Cladding Multi-Core Photonic Crystal Fiber,TN253
  15. 6mm stainless steel ( 304 ) fiber laser welding technology research,TG456.7
  16. High Power Photonic Crystal Fiber Laser and Coherent Beam Combining Techniques,TN248
  17. Cesium atomic clock driver source - 852nm tunable fiber lasers,TN248
  18. Dual wavelength ring cavity erbium-doped fiber laser,TN248.4
  19. FBG -based tunable erbium-doped fiber laser in,TN248
  20. Theoretical and Experimental Studies of Yb3+-doped Double-clad Fiber Lasers,TN248
  21. Recognition of Molten Pool Characteristics during High-power Fiber Laser Welding,TG456.7

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Laser technology, the maser > Laser
© 2012 www.DissertationTopic.Net  Mobile