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Research On Optical Frequency Comb Generation For Integrated RF Front End

Posted on:2019-11-17Degree:MasterType:Thesis
Country:ChinaCandidate:T H DuFull Text:PDF
GTID:2428330596450071Subject:Electromagnetic field and microwave technology
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The RF system of the next generation of radar,electronic warfare and communications is developing towards the comprehensive integration of general purpose,ultra-wideband,multi-function and flexible reconfiguration,and it urgently needs to achieve integration at the front-end of radio frequency.With the advantages of photonic technology,such as large bandwidth,parallel processing,flexible reconfiguration and so on,the construction of integrated RF front-end based on microwave photonic technology has become an important development direction.Optical frequency comb is a key part of microwave photonic integrated RF front-end.Its stability and signal to noise ratio characteristics determine the performance of the system from the source,which has important research significance.In view of the demand for high stability,high signal-to-noise ratio and high coherence of optical frequency comb,we have carried out research on the optical frequency comb based on coupled optoelectronic oscillator in the following three aspects.1.A coupled optoelectronic oscillator based on semiconductor saturable absorber mirror is proposed and studied.The saturated absorption effect of semiconductor saturable absorber mirror suppresses the super mode noise in laser cavity and improves the system performance.The theoretical analysis of the mechanism of semiconductor saturable absorption mirror super mode noise suppression is done.We build an experimental verification system and generate the optical frequency comb with interval of 10.664 GHz,whose super mode suppression ratio is 57.64 dB,side mode suppression ratio of corresponding RF signal is 79.74 dB and the phase noise at 10 kHz offset is-109.95 dBc/Hz.2.We propose and study a polarization maintaining coupled optoelectronic oscillator based on the unpumped erbium-doped fiber.The super mode noise is suppressed by the saturated absorption effect in the unpumped erbium-doped fiber,and the polarization dependent noise is reduced by using the polarization maintaining structure.The theoretical analysis and derivation mechanism of super mode noise suppression in unpumped erbium-doped fiber is done.By optimizing the experimental parameters of erbium doped fiber,we generate the optical frequency comb with interval of 10 GHz,whose super mode noise suppression ratio is 61.81 dB,the side mode suppression ratio of corresponding RF signal is 94.02 dB and the phase noise at 10 kHz frequency-121.94 dBc/Hz.3.A coupled optoelectronic oscillator based on unpumped erbium-doped fiber standing wave effect enhancement structure is proposed and studied.By introducing the standing wave enhancement structure,we can enhance the suppression of super mode noise.The theoretical analysis and experimental verification is done.We take a research on the effect of the system performance by the key parameters such as positive and reverse power of standing wave enhancement structure and erbium-doped fiber absorption coefficient.We generate the optical frequency comb with interval of 10 GHz,whose super mode suppression ratio is 75.44 dB,the side mode suppression ratio of corresponding RF signal is 90.71 dB and the phase noise at 10 kHz offset is-130.52 dBc/Hz.
Keywords/Search Tags:Regeneratively mode-locked, Optical frequency comb, Fiber laser, Integrated RF frontend, Optical pulse
PDF Full Text Request
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