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Research on Ultru-Narrow Linewidth Multi-Wavelength Fiber Laser

Author: XuPan
Tutor: HuYongMing
School: National University of Defense Science and Technology
Course: Optical Engineering
Keywords: Fiber lasers Dual Wavelength Multi-wavelength Ultra - narrow linewidth Mode competition
CLC: TN248
Type: Master's thesis
Year: 2008
Downloads: 267
Quote: 1
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Abstract


The multi-wavelength laser light source (MWL) is a large-scale fiber-optic hydrophone array wavelength division multiplexing (WDM) systems critical devices, especially in non-equilibrium phase carrier (PGC) demodulation interference meter fiber optic hydrophone array, not only requires has the characteristics of multi-wavelength light source also must have the characteristics of the ultra-narrow linewidth, high stability and tunable. Therefore, the ultra-narrow linewidth multi-wavelength laser to study the development of fiber-optic hydrophone technology has important significance. By theoretical analysis, numerical simulation and experimental study of the ultra-narrow linewidth dual-wavelength erbium-doped fiber laser implementations are explored. The main work is as follows: 1. Introduction of the simplified model based on the variety of erbium-doped fiber (EDF) Giles model, different approximate level of the erbium-doped fiber characteristics and erbium-doped fiber laser (EDFL) Analytical study. Establish the the ring cavity erbium-doped fiber laser simulation model, with front and rear to enlarge spontaneous emission (ASE) noise of a single wavelength and multi-wavelength oscillation simulation to optimize the design of laser parameters. The analytical model derivation the gain equalization ways ordinary ring cavity dual wavelength balance out the radio conditions, and simulation and experimental verification. The simulation results show that to achieve dual-wavelength balanced by gain equalizer exit loss spectrum of small changes in the laser mode competition process; uniform gain widened model, have a strong impact, a loss of 0.05 dB deviation will cause the balance to undermine. The three gain equalization and loss control technology-based dual-wavelength ring laser structure experimental study are dual-wavelength output. Parallel structure based on fiber Bragg grating (FBG), adjust the pumping power mode loss as well as the wavelength interval of each parameter and the relationship between the output power of the dual-wavelength. The results show that the case away from the threshold value, dual-mode oscillation has stabilized, the stability of the annular cavity loss greater impact on the balance of the dual wavelength 0.3dB the volatility will lead to dual-mode balanced oscillator destruction, so that a pattern annihilation. By the loss of the stability of the system, measured at two wavelengths of the two-wavelength laser output power fluctuation is less than 0.5dB. Measured not pumped erbium-doped fiber saturation absorption characteristics and standing waves induced gain hole burning causes loss wavelength characteristics, laid the foundation for the ultra-narrow linewidth laser research. The designed FBG series and shunt dual wavelength ultra-narrow linewidth laser experiment results show that the tandem structure can not be achieved ultra-narrow linewidth dual-wavelength laser, the parallel structure dual wavelength output can be obtained, two modes, mode competition power balance can not be achieved: two wavelength power difference of 30dB. By adjusting the loss, it is possible to obtain a two-wavelength laser having a wavelength switching characteristics. The experimental results show that two-wavelength laser and dual wavelength ultra-narrow linewidth laser, the narrow linewidth multi wavelength laser easy to get ultra-narrow linewidth dual-wavelength laser is difficult to achieve due to the mode competition mechanism; therefore seek dual wavelength ultra-narrow linewidth The stability of the program of work of the erbium-doped fiber laser is the direction of further research.

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