激光器驱动干涉型光纤陀螺光源相位调制技术研究

激光器驱动干涉型光纤陀螺的优点是潜在精度高、标度因数稳定性好等,在飞机、舰船惯性导航以及其他高性能领域具有广泛的应用前景。当然,干涉型光纤陀螺采用高相干光源面临诸多技术挑战,如相干瑞利散射、Kerr效应、偏振交叉耦合、Faraday效应等引起的漂移和噪声。采用宽线宽激光器可以抑制这些误差。针对激光器驱动干涉型光纤陀螺中加宽激光器线宽、降低激光器相干性的几种相位调制技术以及线宽加宽抑制噪声的效果进行了理论分析和评估。

Study on Source Phase Modulation Technologies for Laser-Driven Interferometric Fiber Optic Gyroscope

Laser-driven interferometric fiber-optic gyros (IFOG) have been shown to offer several critical advantages like potentially high accuracy, high scale-factor stability and so on. For IFOG, using high coherence light source still faces many technical challenges, such as errors caused by coherent Rayleigh scattering, Kerr effect, Faraday effect and polarized cross-coupling. Nevertheless, these errors can be suppressed by using wide line-width lasers. In this paper several phase modulation techniques which can broaden the laser line-width and reduce the laser coherence in laser-driven IFOG are analyzed and the effect of noise suppression is evaluated.