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Study On Dual-Wavelength Single Frequency Fiber Laser

Posted on:2015-02-08Degree:MasterType:Thesis
Country:ChinaCandidate:T G SunFull Text:PDF
GTID:2268330428985339Subject:Communication and Information System
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The optical communication products are key products of national strategicemerging industries, fiber laser is a kind of promising active fiber optic components.Fiber laser has the advantages of simple structure, easy fabrication, low cost, goodheat dissipation, high coupling efficiency with optical fiber component and immunityto electromagnetic interference, it has wide application prospect in fiber opticcommunication, fiber optic sensing, optical access, radio over fiber, etc. However,fiber laser usually operates in multiple longitudinal modes, different lasingwavelengths suffer from serious competition due to the homogeneous broadeningeffect of erbium doped fiber at room temperature, its practical application in alloptical communication, distributed fiber optic sensing, broadband optical access andradio over fiber is limited. High performance fiber laser is of great significance,dual-wavelength fiber laser operating in single frequency operation has attractedsustained attention.The thesis mainly focus on dual-wavelength single frequency fiber laser, thefollowing works have been accomplished:1. The development process, structural classification and research significance offiber laser are introduced, the key problems of single frequency fiber laser arediscussed, the key problems and latest research progress of dual-wavelength singlefrequency fiber laser are summarized in detail.2. The theoretical model of erbium doped fiber ring laser output powercharacteristic is deviated, the influence factors of fiber laser output power arenumerically simulated. The analysis method of frequency characteristic based onoptical sampling oscilloscope and Fabry-Perot scanning interferometer are studied,the output optical intensity function of fiber laser is deviated, theoretical deviationproves that single frequency operation can be approximately verified using opticalsampling oscilloscope. The working principle of delayed zero homodyneinterferomery and delayed self heterodyne interferomery in the application oflinewidth measurement of fiber laser are compared, laser linewidth can be moreaccurately measured by using delayed self heterodyne interferomery.3. The working principle of single frequency fiber laser is analyzed, longitudinalmode selection of erbium doped fiber acting as staturable absorber is summarized indetail. A single frequency fiber laser based on polarization maintaining erbium doped fiber is proposed and demonstrated, simulation results show that the design scheme ofsingle frequency fiber laser is effective. Polarization maintianing erbium doped fiberacting as saturable absorber is employed in the cavity, the laser linewidth is measuredby delayed self heterodyne interferomery, the single frequency operation of fiber laseris verified by optical sampling oscilloscope and Fabry-Perot scanning interferometer.Polarization maintianing erbium doped fiber acting as saturable absorber is removedfrom the cavity, the mutiple longitudinal modes operation of fiber laser is verfied byoptical sampling oscilloscope and Fabry-Perot scanning interferometer. Experimentalresults prove that single frequency operation can be approximately verified usingoptical sampling oscilloscope, polarization maintaining erbium-doped fiber acting assaturable absorber is effective on selecting longitudinal modes and suppressing modehopping.4. A simple dual-wavelength single frequency fiber laser based on birefringentfiber filter is proposed and demonstrated, the dual-wavelengthfiber laser has theadvantage of compact structure, birefringent fiber filter consists of polarizationcontroller, polarization maintaining erbium doped fiber and fiber polarizer,experimental results show that the lasing dual-wavelength operates in singlefrequency operation and gains equalized output peak power.5. A dual-wavelength single frequency fiber laser based on cacased fiber Bragggrating and birefringent fiber filter is proposed and demonstrated, cascaded fibergrating is employed to realize dual-wavelength lasing with special center wavelengths,experimental results show that our proposed fiber laser operates in single frequencyoperation, the wavelength spacing is widely tunable, output peak power of the lasingdual-wavelength is equalized at room temperature. The modulation performance ofsingle lasing wavleength is testified under high speed external modulation, the cleareye diagram indicates that our proposed fiber laser operates in dynamic singlefrequency mode, it has practical application in large capacity and long distance opticalcomunication in future.6. The simulation model of microwave generation based on dual-wavelengthsingle frequency fiber laser is established, simulation results show that microwavesignal can be generated by beating the lasing dual-wavelength in a high speedphotodetector, the larger wavelength spacing, the higher frequency of beating signal.A dual-wavelength single frequency fiber laser for photonic generation of microwavesignal is studied, experimental result show that the lasing dual-wavelength operates insingle frequency operation and gains equalized output peak power, microwave signal at26.49GHz is obtained by optical beating, our proposed dual-wavelength singlefrequency fiber laser can be one of the most promising candidates in the application ofmicrowave generation.
Keywords/Search Tags:dual-wavelength fiber laser, single frequency, polarization maintaining erbiumdoped fiber, saturable absorber, birefringent fiber filter
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