Dissertation > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Laser technology, the maser > Laser

Research of Erbium-Doped Fiber Laser Based on the Nonlinear Optical Loop Mirror

Author CaoLing
Tutor ZhouXiJian;YangLingZhen
School Taiyuan University of Technology
Course Physical Electronics
Keywords Erbium-doped fiber laser Passively mode-locked Nonlinear optical loop mirror Wavelength tunable
Type Master's thesis
Year 2007
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Erbium-doped fiber laser compared to conventional solid-state lasers , has small size , light weight , compact structure , high reliability, is one of the hot research topics in the field of laser technology . Ultrashort pulse erbium-doped fiber lasers have a wide range of applications in the the OTDM system and optical wavelength division multiplexing system OTDM / WDM , the papers focused on nonlinear optical loop mirror erbium-doped fiber laser , combined with the existing conditions of the laboratory work as follows : 1 , summarizes the characteristics and applications of fiber lasers , comprehensively reviewed and summarized the development of fiber lasers . The comparative analysis of various Clamping technology advantages , disadvantages , and expounded the principle of a variety of fiber laser mode-locked , which focuses on the basic principles of the passively mode-locked fiber laser based on nonlinear optical loop mirror eight . And analysis of the problem of the stability of the mode-locked fiber laser . 2 , erbium-doped fiber amplifier gain flatness ultrashort pulse erbium-doped fiber laser experiment . Addition clamping technique using a nonlinear optical loop mirror , obtained from vibrating , stable maximum output power of 0.6mW clamping pulse output corresponding to the spectral width of 10nm, central wavelength of 1561nm, the pulse width 434ps, pulse repetition frequency is 1.1MHz. The pulse after the EDFA amplified , the maximum output power of 10.8mW. The center wavelength of the amplified mode-locked pulses remain constant , spectral bandwidth is slightly narrowed significantly increased output power , the pulse width broadened to 484ps . In order to study the NOLM the length and width of the output pulse , the relationship of the locking threshold , the experiments also respectively 100m and 50m ordinary quartz optical fiber , respectively, to obtain the shortest pulse width 346ps, 176ps clamping pulse output . 3, using a nonlinear optical loop mirror as a passive mode-locking devices , tunable fiber grating filters as wavelength tuning devices to achieve the eight cavity passively mode-locked erbium-doped fiber laser wavelength tunable output polarization controller and polarization dependent power equalizer constituted by the optical isolator , to achieve a balance of strength between the optical pulse of each wavelength , to obtain spectral stabilization , the repetition frequency of 1.1MHz, the output power fluctuation is less than 0.8dBm , continuously adjustable locking of the center wavelength in the 1548 nm to 1570nm mode pulse sequence .

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