Time difference compensation method and device

Abstract

The invention discloses a time difference compensation method. The method comprises the following steps: acquiring a first signal and a second signal, and determining a forward interpolation result and a backward interpolation result of the second signal; respectively determining the first relevance of the first signal and the second signal, the second relevance of a difference value of the firstsignal and the difference value of the second signal, the third relevance of the difference value of the first signal and the difference value of the forward interpolation result of the second signal,and the fourth relevance of the difference value of the first signal and the difference value of the backward interpolation result of the second signal; and adjusting the time difference compensationvalue based on the preset adjusting rule according to the first difference value of the second relevance and the first relevance, and / or the second difference value of the third relevance and the first relevance, and / or the third difference value of the fourth relevance and the first relevance, wherein the time difference compensation value is used for adjusting the time difference of the first signal and the second signal. The invention further discloses a time difference compensation device.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a time difference compensation method and device. Background technique [0002] In a high-speed optical communication network environment, a coherent optical receiver is usually used to receive and process photoelectric signals; the coherent optical receiver mixes the received optical signal with the optical signal output by the local laser, and divides it into an X-biased positive in-phase signal (XI), X-bias front quadrature signal (XQ), Y-bias front in-phase signal (YI) and Y-bias front quadrature signal (YQ), and then the four signals are respectively subjected to photoelectric conversion (O / E, Optical to electrical), power amplification (TIA, Trans-Impedance Amplifier) ​​and analog-to-digital conversion (ADC, Analog-to-Digital Convert), and finally into the digital signal processor (DSP, Digital Signal Processor). [0003] Ideally, XI and XQ, YI and YQ should ...

AI Technical Summary

Problems solved by technology

This method works well when the coherent optical receiver is first used, but as the coherent optical receiver components age or the environment changes, the time difference between IQ signals will change dynamically, and the time difference compensation value set during calibration The effect will gradually become worse

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