Application of group delay estimation for optical transmitter authentication using bispectrum algorithm

In order to authenticate the optical transmitter effectively and improve the transmission performance of the optical communication greatly, the paper studies a method of optical transmitter authentication based on group delay estimation. The paper extracts the bispectrum phase information of the optical channel according to the communication frame sequence of the transceiver system, and lists the phase frequency coefficient square matrix of the transmission system to estimate the transmitter group delay characteristic parameters. The simulation results show that, even when the signal to noise ratio (SNR) is 5dB, normalized mean square error (NMSE) of estimated group delay by the bispectrum algorithm can reach -18dB. Compared with the traditional method, the method introduced in this paper show that the group delay estimation method is more effective and has better performance against noise.