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Study On Dual-wavelength Narrow Line-width Fiber Ring Laser And Its Application

Posted on:2011-12-01Degree:MasterType:Thesis
Country:ChinaCandidate:Q JiFull Text:PDF
GTID:2178330332469523Subject:Signal and Information Processing
Abstract/Summary:PDF Full Text Request
With the coming of information era, human society's increasing demand for communication capacity drives the introduction of Wavelength Division Multiplexing(WDM). In present, the number of signal channels keeps increasing with the development of WDM communication system. Due to their economic cost, it is an indispensable way to utilize multi-wavelength lasers as optical sources in communication system. Multi-wavelength fiber lasers become the research focus for their attracting merits among the different kinds of lasers. This thesis is mainly concentrated on dual-wavelength narrow linewidth fiber ring laser and its application. The main work includes the detail descriptions on the following:1. The fundamental kinds of resonators of fiber laser were introduced. The transmission characteristics of fiber ring resonator were analyzed.2. The transmission spectrum of dual-πphase-shifted fiber Bragg grating with symmetrical structure was analyzed. Based on the theoretical analysis, we proposed a dual-wavelength fiber ring laser with wavelength spacing of 0.076nm using a dual-πphase-shifted FBG. Phase-shifted fiber Bragg grating with wide wavelength-spacing, stopband and narrow-linewidth could be easily realized by properly choosing the parameters of fiber Bragg gratings, and this will benefit the optical generation of microwave/millimeterwave with high frequency.3. The experimental study of saturable absorber' effect on the modes of laser was carried. An Er3+-doped fiber ring laser was proposed, in which a 1m and 2m Er3+-doped fiber was used as saturable absorber respectively. The experiment results show that the modes of laser were great attenuated by the saturable absorber. The narrow band-pass optical filter can't be formed in the saturable absorber.4. A scheme of a novel frequency synthesizer based on the optical heterodyne technique was proposed. A 10GHz-photoelectric detector was utilized to detect a multi-longitudinal-mode laser beam which was produced by a multi-longitudinal mode Er3+-doped fiber ring laser with cavity length of 27m, and a series of beating signals with frequency spacing of 7.63MHz were obtained at the output port of the detector. The output frequency was from 0 to 10GHz, which was restricted by the response frequency of the photoelectric detector.5. A novel method for the measurement of the effective cavity length of DBR fiber laser with fiber Bragg grating Fabry-Perot cavity as the resonator was proposed. The effective cavity length of DBR fiber laser was accurately measured by measuring the frequency spacing of two adjacent longitudinal modes in the cavity without the precise physical length of fiber Bragg gratings. The measurement result was in great agreement with the theoretical calculated result. The measurement accuracy was as high as 10-4 mm.
Keywords/Search Tags:fiber-optical communication, fiber ring laser, dual-wavelength, narrow line-width
PDF Full Text Request
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