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DMD-Based Tunable Single-Longitudinal-Mode Fiber Laser And Its Application

Posted on:2015-02-05Degree:MasterType:Thesis
Country:ChinaCandidate:T WangFull Text:PDF
GTID:2298330467462230Subject:Electronic Science and Technology
Abstract/Summary:PDF Full Text Request
The tunable single-longitudinal-mode fiber laser is an important optical source, and has been investigated intensively for many applications, such as wavelength-division-multiplexing, optical instrument testing, spectroscopy and optical fiber sensors. Compared with other lasers, Erbium-doped fiber laser (EDFL) has many excellent advantages, including low intensity noise, inherent compatibility with fiber, long life pumping. The unique feature and innovative point of this paper is that by utilizing an Opto-DMD processor, tunable wavelength can be generated only through producing reconfigurable diffraction gratings to steer lasing wavelengths by means of the Opto-DMD processor without any mechanically shift. Based on the Opto-DMD processor, the innovative research results of this paper are as follows;(1) A single-longitudinal-mode tunable erbium-doped fiber laser with two sub-ring cavities based on Opto-DMD processor is experimentally demonstrated. The DMD processor, which can select and couple any waveband from the gain spectrum of the EDFA into the main fiber ring, is combined with two different short passive sub-ring cavities, which are inserted into the main ring cavity and serve as mode filters, to make SLM lasing. The tunable SLM-EDF laser shows a narrow line-width of0.25pm and a tuning step of0.055nm. The side-mode suppression ration is above45dB, and the output power is more than5dBm in the operating range. The center wavelength shift and power fluctuation are below0.015nm and0.08dBm respectively. (2) An original approach for generating frequency-tunable microwave signals is proposed and experimentally demonstrated by using a dual-wavelength single-longitudinal-mode erbium doped fiber ring laser. In the proposed configuration, the Opto-DMD processor, four-wave mixing in a high-nonlinear photonic crystal fiber and two different short passive sub-ring cavities are adopted to generate dual-wavelength SLM lasing with tunable wavelength spacing. The wavelength spacing can be smartly adjusted from0.165nm to1.08nm with a tuning accuracy of0.055nm. In the proposed scheme, microwave signal at17.23GHz and27.47GHz are generated by beating two SLM wavelengths at a high-speed photodetector. What is more, it has the ability to generate135GHz microwave signal at room temperature.
Keywords/Search Tags:tunable fiber laser, single-longitudinal-mode, Opto-DMD, photonics crystal fiber
PDF Full Text Request
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