System for calibrating time delay asymmetry of high-accuracy optical fiber bidirectional time comparison device

Abstract

The invention discloses a system for calibrating the time delay asymmetry of a high-accuracy optical fiber bidirectional time comparison device. The system comprises a first time-frequency standard, a second time-frequency standard, a plurality of cables, a plurality of optical fibers, a first optical fiber bidirectional time comparison calibration device, a second optical fiber bidirectional time comparison calibration device, a first high-accuracy time delay testing device, a second high-accuracy time delay testing device and optical fiber bidirectional time comparison devices i (i=A, B) to be calibrated. According to the system, the asymmetry of time delays between the optical fiber bidirectional time comparison devices can be easily and conveniently calibrated, the asymmetry of time delays between any time frequency devices can be calibrated, and influences, caused by different time delays of the optical fibers or the cables, on the accuracy can be effectively avoided.

Description

technical field [0001] The invention relates to a calibration method for equipment time delay in the field of optical fiber time synchronization, in particular to a high-precision optical fiber two-way time comparison equipment time delay asymmetry calibration system. Background technique [0002] Device delay refers to the additional delay generated when the signal passes through the device, which is an inherent characteristic of the device. High-precision optical fiber two-way time comparison sends and receives timing signals through optical fiber links for time synchronization. To obtain accurate time synchronization accuracy, it is necessary to deduct the delay asymmetry of the optical fiber time comparison equipment to obtain accurate clock difference. Therefore, the calibration accuracy of the delay asymmetry of the optical fiber time comparison device itself will directly affect the accuracy of the optical fiber time synchronization system, and it is a key technology ...

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Problems solved by technology

The German Federal Institute of Physics and Technology (Federal Institute of Physics and Technology) proposed a satellite-based optical fiber two-way time comparison device delay asymmetry method (Rost, M., et al."Time transfer through optical fibers over a distance of73km with an uncertainty below100ps."Metrologia49.6(2012):772.), but it cannot deduct the influence of optical fiber and cable on the accuracy of equipment

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