TY  - JOUR
AU  - XU, Shaoyi
AU  - YIN, Lu
AU  - DENG, Xing
AU  - PANG, Fubin
AU  - WANG, Chengtao
AU  - SONG, Aiguo
PY  - 2026
TI  - Influencing factors and suppression strategies of straight waveguide phase modulator error in fiber optical current transformers
JO  - Electric Power Engineering Technology
SN  - 2096-3203
SP  - 129
EP  - 138
VL  - 45
IS  - 7
AB  - The performance of a straight waveguide phase modulator is influenced by insertion loss and half-wave voltage, which in turn can lead to the degradation of fiber optical current transformers (FOCTs). Therefore, elucidating the impact patterns of insertion loss and half-wave voltage on the system error of FOCTs is crucial for further enhancing the performance of phase modulators. Based on the analysis of the working principle of the direct-coupled waveguide phase modulator, the theoretical models for both insertion loss and half-wave voltage of the modulator are established. Experiments are conducted to observe the variations of insertion loss and half-wave voltage under different environmental conditions, and to ascertain the influence of these variations on the system error of FOCTs. A long short-term memory neural network is utilized for error compensation of insertion loss and half-wave voltage in the direct-coupled waveguide phase modulator. The results show that after error compensation, the output error of the system under variable temperature conditions is within 0.05% and meets the accuracy requirements of the 0.2-class current sensor.
UR  - https://doi.org/10.12158/j.2096-3203.2026.07.012
DO  - 10.12158/j.2096-3203.2026.07.012