Development of Piezoelectric Copolymer Jacketed Fiber and Its Applications

采用偏氟乙烯/三氟乙烯共聚物[P(VDF_x/TrFE_<100-x>), x = 73mol%]径向极化涂覆单模光纤，制成全光纤相位调制器，并将其集成到光纤中。在20 Hz到50 MHz的宽频率范围内，证明了光纤作为相位调制器的光学性能。在低频区测得每米光纤的相位灵敏度为2.1 × 10^<-5>rad/(V/m)，在高频区测得3.5 × 10^<-6>rad/(V/m)/m。在频率高于1 MHz时，光学响应不再平坦，而是由光纤-护套复合材料的径向共振所主导。在分析和实验数据之间存在定性的一致，特别是在7和18 MHz由于径向共振而测量的双峰的外观上。

An all-fiber phase modulator that is an integrated modulator into optical fibers was made by coating single-mode fibers with a vinylidene fluoride/trifluoroethylene copolymer [P(VDF_x/TrFE_<100-x>), x = 73mol%] radially poled. The optical performance of the fiber os a phase modulator was demonstrated over a wide frequency range from 20 Hz to 50 MHz. A phase sensitivity of 2.1 x 10^<-5>rad/(V/m) per meter of fiber was measured in the low frequency region and 3.5 x 10^<-6>rad/(V/m)/m in the high frequency region. The optical response at frequencies higher than 1 MHz was found to be no longer flat and dominated by radial resonances of the fiber-jacket composite. A qualitative agreement exists between analysis and experimental data, especially, on the appearance of the double peaks measured at 7 and 18 MHz due to radial resonances.