基于Labview的分布式光纤光栅信号解调技术研究

Research on distributed fiber bragg grating signal demodulation technology based on labview

分布式光纤光栅信号解调中受到通信信道的码间干扰导致信道均衡性不好,提出基于Labview的分布式光纤光栅信号解调技术。采用连续时间采样技术构建分布式光纤光栅信号采集模型,对信号输出的功率谱密度特征进行相位调制处理,在离散的维纳模型下提取分布式光纤光栅信号的偏移中心频率和单边带功率谱密度特征信息,通过Labview的调制解调技术实现对信号的调制解调处理,最后采用抗相位噪声干扰的星座图分析方法分析光纤光栅信号解调的抗干扰性和误码抑制能力。仿真结果得知,该方法进行分布式光纤光栅信号解调的抗干扰性较好,提高了信道的频谱带宽,降低了频率中心偏移,传输误码率低于0.05%,信号的传输延时维持在30μs左右,具有较强的应用性。

A distributed fiber grating signal demodulation technology based on Labview is proposed due to poor channel balance caused by inter symbol interference in communication channels in distributed fiber grating signal de-modulation.The continuous time sampling technology is used to build a distributed fiber grating signal acquisition mod-el,and the power spectral density characteristics of the signal output are phase modulated.The offset center frequency and single sideband power spectral density characteristics of the distributed fiber grating signal are extracted under the discrete Wiener model,and the signal is modulated and demodulated through the modulation and demodulation tech-nology of Labview,Finally,the constellation analysis method of resisting phase noise interference is used to analyze the anti-interference and error suppression capabilities of fiber grating signal demodulation.The simulation results show that this method has good anti-interference performance for distributed fiber Bragg grating signal demodulation,im-proves the spectral bandwidth of the channel,reduces frequency center offset,has a low transmission error rate of 0.05%,and maintains a signal transmission delay of 30μs,with strong applicability.