Average length detection device and method as well as light coherent receiver

Abstract

The invention relates to an average length detection device and method as well as a light coherent receiver. The average length detection method is used for detecting whether the average length of an averager used by a polarization crosstalk eliminating device in the receiver is long or short. The method comprises the steps of determining the value of a residual polarization crosstalk coefficient of the receiver, and determining the index of whether the average length of the averager is long or short according to the value of the determined residual polarization crosstalk coefficient.

Description

technical field [0001] The present invention relates to optical communication, in particular to polarization crosstalk elimination of coherent optical communication system. Background technique [0002] With the gradual improvement of the capacity and flexibility requirements of the optical communication system, the coherent optical communication technology becomes more and more important. In coherent optical communication, polarization multiplexing is usually used to simultaneously modulate the transmitted signal on two polarization states of light, so as to achieve the purpose of doubling the transmission rate under the same bandwidth. At the receiving end, the optical coherent receiver simultaneously receives the signals on the two polarization states and converts them into baseband digital signals. The signals on the two polarization states are separated by the demultiplexing technology in the digital domain, and then the signals on each polarization state are separated....

AI Technical Summary

Problems solved by technology

However, the optimal average length is closely related to the actual communication system conditions, and this preset average length sometimes cannot keep the system performance in an optimal state.

Images