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Study On Time Delay Effect And Temperature Performance Of High Q Microcavity Optoelectronic Oscillator

Posted on:2018-10-27Degree:MasterType:Thesis
Country:ChinaCandidate:J G DuFull Text:PDF
GTID:2348330515983700Subject:Instrument Science and Technology
Abstract/Summary:PDF Full Text Request
With the further development of microwave technology,high frequency microwave has become a major trend of research and development,and it has played a very important role in communication,radar,guidance and so on.As a typical application of high frequency microwave source,The optoelectronic oscillator can produce frequency from a few GHz to several hundred GHz,Q value of 1010,low phase noise of high quality signal,and has a tunable and optical ?electrical output,and thus has become a new hot spot in high frequency microwave technology research.It has been widely concerned by researchers at home and abroad.Firstly,the structure of the Q based micro cavity optoelectronic oscillator is introduced in this paper,and the theoretical analysis of the optical fiber ring resonator based on the high Q micro ring resonator is presented.Secondly,the conditions of the oscillator(threshold condition and phase condition),the spectrum and phase noise of the oscillator are analyzed.Finally,Based on the analysis of the effect of temperature on the temperature sensing unit such as optical fiber and filter circuits,the mechanism of temperature regulation of the photoelectric oscillator is introduced in detail.Based on the theoretical analysis and detailed analysis of the optoelectronic oscillator system,the delay effect of traditional long optical fiber system is studied in this paper,long fiber is instead of high Q fiber ring resonators as the delay and storage unit of the oscillation circuit,according to the delay effect of the system,We get the relationship between the fiber ring resonator Q value and OEO system Q value,system delay.Using fiber ring resonator as optoelectronic oscillator delay device,can reduce the influence of the traditional long fiber in temperature,stress to some extent.and under the conditions of same delay,the system volume is optimized greatly,which provides a new feasibility program for the optoelectronic oscillator's practical and integrated research.The phase noise of the OEO is measured down to-57.7dBc/Hz at 10 kHz offset of the 2.01 GHz output,Phase noise level is bad.In order to improve the phase noise,we optimize the system structure with locking circuit module,The output frequency of the locked laser is adjusted by the feedback,so that the photon is always in a state of resonance when passing through the cavity,the center frequency of 10.4 GHz phase noise under before and after frequency locking circuit OEO system were-71.34 dBc and-91.35 dBc.Phase noise is improved by about 20 dBc.Finally,the temperature effect of the system is analyzed in detail.By adding a temperature control module,the fiber loop temperature control system is arranged in the cavity,the optoelectronic oscillator frequency stability is analyzed.The experimental results show that under the laboratory condition,the frequency of the high Q micro ring cavity OEO is-0.35 ppm under the condition of 30 Centigrade for OEO.It shows a good short-term frequency stability.At the same time,by adjusting the temperature from 20-50 Centigrade,the center frequency offset is 2.24 MHz.It has a certain frequency tunability.
Keywords/Search Tags:optoelectronic oscillator, Optical micro-ring resonator, time-delay, phase noise, Frequency stability
PDF Full Text Request
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