Study On Millimeter-wave Generation Technology Based On Distributed Bragg Reflector Fiber Laser

With the rapid development of wireless communication technology and the demand for multimedia broadband services increasing, the modern means of communication will develop to ultra-speed, large capacity, which request communications frequencies up to millimeter-wave frequency bands to provide much larger transmission bandwidth. Millimeter-wave communication has large transmission capacity, but it can not achieve the long-distance communications in the atmosphere, accompanied by the rapid development of optical fiber communication, Radio over fiber (RoF) communication systems which combine of optical fiber communication technology and radio-frequency millimeter-wave communication came into being.One of the key technology in RoF system is the generation of millimeter-wave. At present, the optical heterodyne technology becomes the most potential lightwave-Millimeter synthesis scheme due to its unique advantages. In this paper, the theoretical and experimental research is done about millimeter-wave generation technology based on single-longitudinal-mode dual-wavelength Distributed Bragg Reflector (DBR) fiber laser. The main work of this paper reads as follows:First, a detailed theoretical research is carried out about the theoretical basis of the fiber laser and optical heterodyne technology.Second, proposed a method to generate millimeter-wave signals by using a single-longitudinal-mode dual-wavelength DBR fiber laser based on fiber Bragg grating F-P cavity and experimentally demonstrated.Fiber Bragg grating and fiber Bragg grating F-P cavity are in-depth researched and an experimental device is constructed. Single-longitudinal-mode dual-wavelength laser is output, whose wavelengthes are 1546.608nm and 1546.688nm respectively, with a wavelength spacing of 0.08nm. The measured sidemode-suppression ratio (SMSR) exceeds 40 dB. A millimeter-wave is acquired by optical heterodyne technology.The frequency of millimeter signal is 10.5GHz,3dB bandwidth about 30.198KHz. The temperature characteristics and stability of laser and millimeter signal are both researched.Third, proposed a method to generate millimeter-wave signals by using a DBR fiber laser based on fiber birefringence properties and experimentally demonstrated. First, theoretical analysing fiber birefringence properties, then constructing DBR fiber laser to achieve single-longitudinal-mode laser, output wavelength is 1554.088nm,the frequency of millimeter signal is 1.72GHz,3dB bandwidth about 29.994KHz. The temperature characteristics and stability of laser and millimeter signal are both researched.And proposed a method of stress-induced birefringence to achieve single-longitudinal-mode dual-wavelength laser, the output wavelengthes are 1547.128nm and 1547.224nm respectively, with a wavelength spacing of 0.096nm,the frequency of millimeter signal is 11.4GHz,3dB bandwidth about 32.973KHz. Fourth, influencing factors of millimeter signals generated by DBR fiber laser were studied. The influence of temperature, pressure and strain on the millimeter signal is analyzed.