基于光纤布拉格光栅的光纤无线电系统的毫米波研究

The research of millimeter wave in ROF system based on the fiber bragg grating

随着宽带通信服务的日益增加,用于无线通信网络的载波频率更高才能满足带宽的需求。光纤无线电系统由于光纤的低传输损耗和超宽带的特点被用于宽带无线接入系统。利用光学的方法产生高频载波是光纤无线电系统中的关键技术之一。在光纤无线电系统中利用光纤布拉格光栅从可调谐激光器中反射出两束相位近似相等的相干光,利用光外差的原理经过光电探测器接收之后产生的毫米波信号,降低了相位噪声对产生的毫米波信号的影响。通过仿真发现在带通滤波器的输出端产生了频率为两束相干光频率差60GHz的毫米波信号,分析了随着光纤的长度增加,毫米波信号的变化情况。

As the demand tbr broadband communication increases, higher carrier trequencies in wireless networks are utilised to accommodate the bandwidth requirement. The radio over fibre （ RoF） system is a promising technology for broadband wireless access applications because of the many advantages of the optical fibre, including low transmission loss and ultra- wide bandwidth.Two beam phase approximately equal coherent light are reflected from the tunable laser by the fiber bragg grating, the 60GHz millimeter wave signal is produced by photoelectric detector with the principle of optical heteredyne and the phase noise is reduced. The receiving millimeter wave signal changes are analyzed with optical fiber transmission distance change.