INTRODUCTION: Fiber laser communica

INTRODUCTION: Fiber laser communication is a communication method that uses laser and fiber medium to realize datatransmission and information outputOBJECTIVES: In order to reduce the signal interference of optical fiber communication laser interface and ensure thecommunication quality of optical fiber network. A filtering method of optical fiber communication laser interfaceinterference signal based on digital filtering technology is designed.METHODS: In this paper, the interface model of optical fiber communication network is firstly constructed, and theinterface noise signal is input into the digital filter bank. The digital quadrature filtering method and the least squarealgorithm are used to separate the denoised signals to reduce the crosstalk between the signals in the channel. In this way,the crosstalk component in the signal can be filtered out, and a better filtering processing effect of the laser interfaceinterference signal can be achieved.RESULTS: The results of peak signal-to-noise ratio are above 25, which effectively filters the interference signal in thesignal, and retains the effective signal completely. The intelligibility of optical fiber communication network in signalcommunication is above 0.94, and the highest value is 0.986. The distortion degree are all below 0.025, and the minimumvalue is 0.004. The communication bit error rate are all below 0.001, which ensures the communication quality of thenetwork.CONCLUSION: The experimental results show that the signal noise reduction effect of the proposed method is good,which provides a reliable basis for filtering and separating interference signals of optical fiber communication laserinterface.