IQ signal phase error control method and system

Abstract

The invention discloses an IQ signal phase error control method and system, and relates to the technical field of coherent optical modules, and the method comprises the following steps: achieving thecontrol of an IQ signal phase error through adjusting the intensity coefficient of a channel corresponding to an I-path signal and a Q-path signal. According to the method, a phase shifter is not needed, the orthogonal angle phase error of the IQ signal can be reduced or even eliminated under the condition that an original coherent optical communication system architecture is not changed, and theperformance of the coherent optical communication system is improved.

Description

technical field [0001] The invention relates to the technical field of coherent optical modules, in particular to a method and system for controlling phase errors of IQ signals. Background technique [0002] In a coherent optical communication system, in order to utilize the phase information of light, I and Q modulation and demodulation are performed on the signal, which can greatly improve the capacity and distance of the coherent optical communication system. Coherent receivers use key components such as optical mixers to demodulate mutually orthogonal I and Q signals. [0003] However, in the actual demodulation process, due to certain process errors in the device, the demodulated I and Q signals are not perfectly quadrature, and there is a quadrature angle phase error (referred to as phase error), which reduces the demodulation performance and deteriorates the system performance. , such as the optical signal-to-noise ratio (OSNR). Moreover, the communication rate and ...

AI Technical Summary

Problems solved by technology

However, in practical applications, due to the existence of influencing factors such as noise and dispersion, the compensation range of the algorithm is restricted

At the same time, the algorithm introduces a large calculation load, increases DSP power consumption, and greatly reduces applicable scenarios. For example, the DSP for data center may not support this algorithm.

In addition, after the algorithm is compensated, it still cannot eliminate the performance degradation of the coherent optical communication system caused by the phase error

Images