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Research On Tunable Optical Generation Of Millimeter-microwave Based On Orthogonal Dual-frequency Fiber Laser

Posted on:2011-01-14Degree:MasterType:Thesis
Country:ChinaCandidate:L W ZhangFull Text:PDF
GTID:2178360305955736Subject:Optical Engineering
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As an important branch of well developed microwave photonics, optical generation of micro-millimeter wave is a key technology in ROF system also. Based on high quality DBR fiber laser fabricated on Er3+/Yb3+ co-doped fiber, we proposed the method of tunable optical generation of millimeter-microwave based on orthogonal dual-frequency fiber laser. This technology has many advantages, such as simple structure, convenient operation and low cost. And we generate tunable micro-millimeter wave based on this technology successfully. The main content of this thesis contains:1, Fabricating DBR fiber laser with stable single mode laser output on Er3+/Yb3+ co-doped fiber successfully, we generated tunable microwave signal based on the device which contained fiber laser as the core, PZT precisely controlled by voltage and steel structure. The span of the generated tunable microwave signal was [3.34GHz,14.75GHz], corresponded the span of voltage [0V,55V] on the PZT. And the tunable sensitivity was estimated to be 0.21GHz/V.2, The first time, we fabricated orthogonal dual-frequency ultra-short cavity fiber laser on the panda Polarization Maintaining Fiber. By precisely controlling the inscribing condition of the UV laser, we solved the problem of mode competition. The wavelength of the fiber laser we fabricated was right in the 1550nm communication wavelength band, and its slope efficiency was 0.226%. And the wavelength gap between the two polarization lasers was 0.25nm, with the line width were merely 60kHz and 70kHz respectively.3, We designed the device to tune the generated millimeter wave signal with the orthogonal dual-frequency ultra-short cavity fiber laser above. By controlling the driving voltage on the PZT, the DBR fiber laser received a force through the fast and the slow axis directions in the PM fiber, thus the millimeter wave signal was tuned. Finally, the span of the dual-frequency laser wavelength gap we obtained was [0.162nm,0.296nm], corresponding to the millimeter wavelength span from 20.36GHz to 37.2GHz.
Keywords/Search Tags:optical generation of millimeter wavelength, Fiber Bragg Grating, fiber laser, Polarization Maintaining fiber, birefringence
PDF Full Text Request
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