Font Size: a A A

Research Of Optoelectronic Oscillator Based On Optical Resonant Cavity

Posted on:2018-08-21Degree:MasterType:Thesis
Country:ChinaCandidate:M ChenFull Text:PDF
GTID:2348330518950898Subject:Full-time Engineering
Abstract/Summary:PDF Full Text Request
As a new type of microwave signal source,OEO can generate RF signal and microwave photonic signal with frequency of up to several hundred GHz and ultra-high frequency spectrum purity.The microwave signal with low phase noise,high spectral purity and high quality factor has been widely used in the field of space exploration,military radar,aerospace,communication and electronic warfare.In recent years,the research of OEO has shifted from reducing the phase noise to the realization of tunable output as well as miniaturization and practicality.First of all,we introduce the basic concept of the optoelectronic oscillator,and discuss the basic principle and application field of OEO.Then,according to the OEO system in long fiber has occupied large volume,easily affected by environment temperature and stress influence,combined with the optical properties of the optical resonator,is proposed to replace long fiber as the OEO system delay device scheme using optical resonator.The effects of different lengths of fiber in the OEO system are studied,and the effects of different delay effects on the microwave signal are analyzed by the experimental data.In order to improve the delay effect of photons in the optical cavity in the experimental design of the frequency modulation system,the photon is always in a resonant optical cavity.The experimental results show that the quality factor(Q value)of 107 optical resonator can replace up to 388 meters long fiber.It is of great significance for the miniaturization of the future optoelectronic oscillator.On the basis of the above analysis,the experimental scheme of tunable optoelectronic oscillator is studied based on the optical resonator.The scheme of using the phase modulator in series transmission optical resonator is proposed,and the electric filter is replaced by photon filter to replace the intensity modulator and filter in the traditional system,and the optimization of the system structure is realized.The experimental results show that the optimized system can output 10 GHz single mode microwave signal,and can realize the tunable length of 23 MHz.The experimental results verify the correctness of the proposed scheme.At the end of this paper,the system noise of the photoelectric oscillator is analyzed,and the phase noise of the system is designed according to the optical resonator system based on the optical resonator.The experimental results show that the phase noise of the microwave signal near the center frequency of 10 GHz is-109.26 dBc / Hz@10k Hz after adding the lock frequency system to compare the de-phase noise effect of the two optimization schemes.By introducing the optical waveguide resonator in the OEO system,the whole OEO system can be reduced to 21×9.5×7 cm3,which provides a new idea for the miniaturization and practical development of the optical oscillator.
Keywords/Search Tags:Optoelectronic oscillator, Microwave signal, Optical resonator, Locking system, The tunable, Phase noise
PDF Full Text Request
Related items