科研之友
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摘要
Optical communication technology has a wide range of applications in aerospace, optical fiber communications, and wireless sensing. One of its core components is the photoelectric signal source. Therefore, it has attracted the attention of many researchers. In this paper, a new type of photoelectric oscillator structure is proposed. Taking the optoelectronic oscillator (OEO) as the optoelectronic signal source, the structure of the coupled optoelectronic oscillator and the structure of the fiber Bragg grating-Fabry-Perot filter are analyzed. This structure uses a fiber Bragg grating-Fabry-Pero filter as an optical ring cavity to generate a stable light-wave signal. In order to reduce the light wave noise at different frequencies, the same Fabry Perot filter is used for secondary filtering. Meanwhile, the interference of the temperature on the output power of the system is also reduced. Further, the microwave photon conversion mechanism under the photoelectric oscillator is studied and the microwave photonic frequency conversion system is designed. The frequency conversion mechanism is set to direct modulation and external modulation. The 400 MHz intermediate frequency (IF) signal is converted to C-band. During the experiment, the optoelectronic oscillator outputs a 9 GHz radio frequency (RF) signal. At an offset frequency of 10 kHz, the phase noise is -115 dBc/Hz. The side mode rejection ratio of the signal output reached -60 dB. In the process of microwave photon conversion, there is an optimal reverse bias voltage and output current. In turn, reasonable local oscillator signal power and IF signal power are obtained. The appropriate increase of optical carrier power can further improve the performance of the frequency conversion.
